/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-simple/nested_5.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 13:33:45,654 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 13:33:45,656 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 13:33:45,698 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 13:33:45,770 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 13:33:45,771 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 13:33:45,772 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 13:33:45,773 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 13:33:45,810 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 13:33:45,810 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 13:33:45,813 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 13:33:45,813 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 13:33:45,813 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 13:33:45,814 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 13:33:45,814 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 13:33:45,814 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 13:33:45,814 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 13:33:45,814 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 13:33:45,815 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 13:33:45,815 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 13:33:45,815 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 13:33:45,815 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 13:33:45,816 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 13:33:45,816 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 13:33:45,816 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 13:33:45,816 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 13:33:45,816 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 13:33:45,816 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 13:33:45,817 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:33:45,817 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 13:33:45,817 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 13:33:45,817 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 13:33:45,817 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 13:33:45,817 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 13:33:45,817 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 13:33:45,818 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 13:33:45,818 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 13:33:46,123 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 13:33:46,141 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 13:33:46,143 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 13:33:46,144 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 13:33:46,144 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 13:33:46,145 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-simple/nested_5.c [2021-05-02 13:33:46,212 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0060272ef/1ee7786c22fa4927aae6006cc26a77a0/FLAGd39a2f10a [2021-05-02 13:33:46,618 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 13:33:46,618 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_5.c [2021-05-02 13:33:46,624 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0060272ef/1ee7786c22fa4927aae6006cc26a77a0/FLAGd39a2f10a [2021-05-02 13:33:46,643 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0060272ef/1ee7786c22fa4927aae6006cc26a77a0 [2021-05-02 13:33:46,646 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 13:33:46,648 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 13:33:46,651 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 13:33:46,652 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 13:33:46,655 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 13:33:46,656 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:33:46" (1/1) ... [2021-05-02 13:33:46,657 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4faecbc1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:46, skipping insertion in model container [2021-05-02 13:33:46,657 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:33:46" (1/1) ... [2021-05-02 13:33:46,663 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 13:33:46,677 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 13:33:46,826 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_5.c[899,912] [2021-05-02 13:33:46,830 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:33:46,837 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 13:33:46,886 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_5.c[899,912] [2021-05-02 13:33:46,887 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:33:46,900 INFO L208 MainTranslator]: Completed translation [2021-05-02 13:33:46,901 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:46 WrapperNode [2021-05-02 13:33:46,901 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 13:33:46,902 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 13:33:46,902 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 13:33:46,903 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 13:33:46,912 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:46" (1/1) ... [2021-05-02 13:33:46,913 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:46" (1/1) ... [2021-05-02 13:33:46,920 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:46" (1/1) ... [2021-05-02 13:33:46,921 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:46" (1/1) ... [2021-05-02 13:33:46,932 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:46" (1/1) ... [2021-05-02 13:33:46,937 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:46" (1/1) ... [2021-05-02 13:33:46,942 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:46" (1/1) ... [2021-05-02 13:33:46,946 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 13:33:46,948 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 13:33:46,948 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 13:33:46,948 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 13:33:46,949 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:46" (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 13:33:47,020 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 13:33:47,020 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 13:33:47,020 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 13:33:47,021 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 13:33:47,021 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 13:33:47,021 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 13:33:47,021 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 13:33:47,021 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 13:33:47,022 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 13:33:47,022 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 13:33:47,022 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 13:33:47,022 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 13:33:47,023 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 13:33:47,023 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 13:33:47,309 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 13:33:47,321 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2021-05-02 13:33:47,323 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:33:47 BoogieIcfgContainer [2021-05-02 13:33:47,323 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 13:33:47,324 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 13:33:47,324 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 13:33:47,326 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 13:33:47,327 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 01:33:46" (1/3) ... [2021-05-02 13:33:47,327 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15abacd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:33:47, skipping insertion in model container [2021-05-02 13:33:47,327 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:33:46" (2/3) ... [2021-05-02 13:33:47,328 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15abacd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:33:47, skipping insertion in model container [2021-05-02 13:33:47,328 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:33:47" (3/3) ... [2021-05-02 13:33:47,329 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_5.c [2021-05-02 13:33:47,333 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 13:33:47,336 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 13:33:47,367 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 13:33:47,412 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 13:33:47,412 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 13:33:47,412 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 13:33:47,412 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 13:33:47,412 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 13:33:47,412 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 13:33:47,412 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 13:33:47,412 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 13:33:47,423 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 19 states have internal predecessors, (30), 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 13:33:47,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-05-02 13:33:47,426 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:47,427 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:47,427 INFO L428 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:47,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:47,431 INFO L82 PathProgramCache]: Analyzing trace with hash -1327885715, now seen corresponding path program 1 times [2021-05-02 13:33:47,438 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:47,439 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1214330087] [2021-05-02 13:33:47,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:47,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:47,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:47,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:47,709 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 13:33:47,710 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:47,710 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1214330087] [2021-05-02 13:33:47,711 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1214330087] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:33:47,711 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:33:47,711 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 13:33:47,711 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1984828291] [2021-05-02 13:33:47,715 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 13:33:47,715 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:47,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 13:33:47,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:33:47,733 INFO L87 Difference]: Start difference. First operand has 24 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 19 states have internal predecessors, (30), 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 13:33:47,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:47,779 INFO L93 Difference]: Finished difference Result 42 states and 62 transitions. [2021-05-02 13:33:47,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 13:33:47,781 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 13:33:47,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:47,787 INFO L225 Difference]: With dead ends: 42 [2021-05-02 13:33:47,787 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 13:33:47,790 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 55.1ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:33:47,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 13:33:47,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-02 13:33:47,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 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 13:33:47,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2021-05-02 13:33:47,832 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 9 [2021-05-02 13:33:47,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:47,832 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2021-05-02 13:33:47,832 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 13:33:47,833 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2021-05-02 13:33:47,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-05-02 13:33:47,833 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:47,833 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:47,834 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 13:33:47,834 INFO L428 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:47,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:47,835 INFO L82 PathProgramCache]: Analyzing trace with hash -1327937609, now seen corresponding path program 1 times [2021-05-02 13:33:47,835 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:47,835 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1452358631] [2021-05-02 13:33:47,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:47,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:47,923 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:47,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:47,950 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 13:33:47,950 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:47,950 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1452358631] [2021-05-02 13:33:47,951 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1452358631] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:33:47,951 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:33:47,952 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:33:47,952 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54073459] [2021-05-02 13:33:47,953 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:33:47,953 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:47,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:33:47,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:33:47,957 INFO L87 Difference]: Start difference. First operand 19 states and 23 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 13:33:48,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:48,084 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2021-05-02 13:33:48,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:33:48,085 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 13:33:48,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:48,087 INFO L225 Difference]: With dead ends: 32 [2021-05-02 13:33:48,087 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 13:33:48,088 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 63.7ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:33:48,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 13:33:48,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 20. [2021-05-02 13:33:48,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.3125) internal successors, (21), 16 states have internal predecessors, (21), 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 13:33:48,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2021-05-02 13:33:48,094 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 9 [2021-05-02 13:33:48,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:48,094 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2021-05-02 13:33:48,095 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 13:33:48,095 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2021-05-02 13:33:48,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 13:33:48,095 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:48,095 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:48,095 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 13:33:48,096 INFO L428 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:48,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:48,096 INFO L82 PathProgramCache]: Analyzing trace with hash 365342218, now seen corresponding path program 1 times [2021-05-02 13:33:48,099 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:48,099 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2011434787] [2021-05-02 13:33:48,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:48,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:48,161 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:48,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:48,169 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 13:33:48,169 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:48,169 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2011434787] [2021-05-02 13:33:48,170 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2011434787] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:33:48,170 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:33:48,170 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:33:48,170 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895870708] [2021-05-02 13:33:48,170 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:33:48,170 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:48,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:33:48,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:33:48,171 INFO L87 Difference]: Start difference. First operand 20 states and 24 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 13:33:48,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:48,241 INFO L93 Difference]: Finished difference Result 41 states and 53 transitions. [2021-05-02 13:33:48,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:33:48,242 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 13:33:48,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:48,243 INFO L225 Difference]: With dead ends: 41 [2021-05-02 13:33:48,243 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 13:33:48,243 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 48.7ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:33:48,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 13:33:48,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 21. [2021-05-02 13:33:48,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 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 13:33:48,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-05-02 13:33:48,249 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 12 [2021-05-02 13:33:48,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:48,249 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-05-02 13:33:48,249 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 13:33:48,250 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-05-02 13:33:48,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 13:33:48,250 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:48,250 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:48,250 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 13:33:48,251 INFO L428 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:48,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:48,251 INFO L82 PathProgramCache]: Analyzing trace with hash -903990269, now seen corresponding path program 1 times [2021-05-02 13:33:48,251 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:48,251 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [327243689] [2021-05-02 13:33:48,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:48,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:48,298 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:48,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:48,304 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 13:33:48,305 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:48,305 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [327243689] [2021-05-02 13:33:48,305 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [327243689] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:33:48,305 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:33:48,305 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:33:48,306 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792395216] [2021-05-02 13:33:48,306 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:33:48,306 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:48,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:33:48,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:33:48,307 INFO L87 Difference]: Start difference. First operand 21 states and 25 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 13:33:48,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:48,420 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2021-05-02 13:33:48,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:33:48,421 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 13:33:48,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:48,421 INFO L225 Difference]: With dead ends: 41 [2021-05-02 13:33:48,422 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 13:33:48,422 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 52.8ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:33:48,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 13:33:48,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 22. [2021-05-02 13:33:48,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 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 13:33:48,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2021-05-02 13:33:48,428 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 15 [2021-05-02 13:33:48,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:48,428 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2021-05-02 13:33:48,429 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 13:33:48,429 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2021-05-02 13:33:48,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 13:33:48,429 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:48,429 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:48,430 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 13:33:48,430 INFO L428 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:48,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:48,430 INFO L82 PathProgramCache]: Analyzing trace with hash 761147182, now seen corresponding path program 1 times [2021-05-02 13:33:48,431 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:48,431 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [406379279] [2021-05-02 13:33:48,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:48,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:48,497 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:48,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:48,503 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:33:48,504 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:48,504 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [406379279] [2021-05-02 13:33:48,504 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [406379279] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:33:48,504 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:33:48,504 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:33:48,504 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [76071131] [2021-05-02 13:33:48,505 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:33:48,505 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:48,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:33:48,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:33:48,506 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 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 13:33:48,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:48,596 INFO L93 Difference]: Finished difference Result 41 states and 51 transitions. [2021-05-02 13:33:48,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:33:48,597 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 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 18 [2021-05-02 13:33:48,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:48,597 INFO L225 Difference]: With dead ends: 41 [2021-05-02 13:33:48,598 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 13:33:48,599 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 73.7ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:33:48,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 13:33:48,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 23. [2021-05-02 13:33:48,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 states have internal predecessors, (24), 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 13:33:48,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2021-05-02 13:33:48,612 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 18 [2021-05-02 13:33:48,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:48,612 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2021-05-02 13:33:48,612 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 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 13:33:48,612 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2021-05-02 13:33:48,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 13:33:48,613 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:48,613 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:48,613 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-02 13:33:48,613 INFO L428 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:48,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:48,613 INFO L82 PathProgramCache]: Analyzing trace with hash 317096575, now seen corresponding path program 1 times [2021-05-02 13:33:48,614 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:48,614 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1329424156] [2021-05-02 13:33:48,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:48,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:48,675 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:48,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:48,689 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:33:48,689 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:48,689 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1329424156] [2021-05-02 13:33:48,689 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1329424156] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:33:48,692 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:33:48,693 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:33:48,693 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [813447856] [2021-05-02 13:33:48,695 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:33:48,695 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:48,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:33:48,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:33:48,702 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 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 13:33:48,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:48,791 INFO L93 Difference]: Finished difference Result 41 states and 50 transitions. [2021-05-02 13:33:48,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:33:48,792 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 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 21 [2021-05-02 13:33:48,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:48,794 INFO L225 Difference]: With dead ends: 41 [2021-05-02 13:33:48,794 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 13:33:48,794 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 51.8ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:33:48,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 13:33:48,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2021-05-02 13:33:48,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 20 states have (on average 1.25) internal successors, (25), 20 states have internal predecessors, (25), 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 13:33:48,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2021-05-02 13:33:48,807 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 21 [2021-05-02 13:33:48,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:48,807 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2021-05-02 13:33:48,807 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 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 13:33:48,807 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2021-05-02 13:33:48,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 13:33:48,808 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:48,808 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:48,808 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-02 13:33:48,809 INFO L428 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:48,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:48,810 INFO L82 PathProgramCache]: Analyzing trace with hash 720998685, now seen corresponding path program 1 times [2021-05-02 13:33:48,810 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:48,810 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687414210] [2021-05-02 13:33:48,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:48,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:48,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:48,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:48,893 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:33:48,893 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:48,893 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1687414210] [2021-05-02 13:33:48,893 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1687414210] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:48,893 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1644299061] [2021-05-02 13:33:48,894 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 13:33:48,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:48,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 13:33:48,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:49,020 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:49,023 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:49,080 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:33:49,080 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1644299061] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:49,080 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:49,080 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 13:33:49,081 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1052687485] [2021-05-02 13:33:49,081 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:33:49,081 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:49,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:33:49,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:33:49,082 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 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 13:33:49,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:49,210 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2021-05-02 13:33:49,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 13:33:49,210 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 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 23 [2021-05-02 13:33:49,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:49,211 INFO L225 Difference]: With dead ends: 44 [2021-05-02 13:33:49,211 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 13:33:49,212 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 91.7ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:33:49,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 13:33:49,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-05-02 13:33:49,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 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 13:33:49,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2021-05-02 13:33:49,217 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 23 [2021-05-02 13:33:49,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:49,217 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2021-05-02 13:33:49,217 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 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 13:33:49,217 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2021-05-02 13:33:49,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 13:33:49,218 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:49,218 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:49,433 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 13:33:49,433 INFO L428 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:49,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:49,433 INFO L82 PathProgramCache]: Analyzing trace with hash -1971097541, now seen corresponding path program 2 times [2021-05-02 13:33:49,433 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:49,434 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [956345458] [2021-05-02 13:33:49,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:49,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:49,496 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:49,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:49,506 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:33:49,507 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:49,507 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [956345458] [2021-05-02 13:33:49,507 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [956345458] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:49,507 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [527352657] [2021-05-02 13:33:49,507 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:33:49,568 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:33:49,568 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:49,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 13:33:49,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:49,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:49,636 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:49,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:49,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:49,707 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:33:49,708 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [527352657] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:49,708 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:49,708 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-05-02 13:33:49,708 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904991530] [2021-05-02 13:33:49,709 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:33:49,709 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:49,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:33:49,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:33:49,711 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 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 13:33:50,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:50,124 INFO L93 Difference]: Finished difference Result 67 states and 81 transitions. [2021-05-02 13:33:50,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 13:33:50,124 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 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 25 [2021-05-02 13:33:50,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:50,127 INFO L225 Difference]: With dead ends: 67 [2021-05-02 13:33:50,127 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 13:33:50,128 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 356.0ms TimeCoverageRelationStatistics Valid=117, Invalid=225, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:33:50,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 13:33:50,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 37. [2021-05-02 13:33:50,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 33 states have (on average 1.1818181818181819) internal successors, (39), 33 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 13:33:50,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 42 transitions. [2021-05-02 13:33:50,141 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 42 transitions. Word has length 25 [2021-05-02 13:33:50,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:50,141 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 42 transitions. [2021-05-02 13:33:50,142 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 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 13:33:50,142 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 42 transitions. [2021-05-02 13:33:50,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 13:33:50,142 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:50,143 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:50,357 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:50,357 INFO L428 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:50,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:50,357 INFO L82 PathProgramCache]: Analyzing trace with hash 1068941198, now seen corresponding path program 3 times [2021-05-02 13:33:50,357 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:50,357 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [641071980] [2021-05-02 13:33:50,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:50,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:50,412 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:50,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:50,421 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-05-02 13:33:50,421 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:50,421 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [641071980] [2021-05-02 13:33:50,421 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [641071980] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:50,422 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1343318951] [2021-05-02 13:33:50,422 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 13:33:50,476 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 13:33:50,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:50,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 13:33:50,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:50,544 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:50,547 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:50,561 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 13:33:50,561 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1343318951] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:50,561 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:50,561 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 7 [2021-05-02 13:33:50,562 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308108016] [2021-05-02 13:33:50,562 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 13:33:50,562 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:50,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 13:33:50,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:33:50,563 INFO L87 Difference]: Start difference. First operand 37 states and 42 transitions. Second operand has 7 states, 7 states have (on average 5.285714285714286) internal successors, (37), 6 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 13:33:50,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:50,911 INFO L93 Difference]: Finished difference Result 243 states and 285 transitions. [2021-05-02 13:33:50,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 13:33:50,917 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.285714285714286) internal successors, (37), 6 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 36 [2021-05-02 13:33:50,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:50,919 INFO L225 Difference]: With dead ends: 243 [2021-05-02 13:33:50,921 INFO L226 Difference]: Without dead ends: 213 [2021-05-02 13:33:50,922 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 222.8ms TimeCoverageRelationStatistics Valid=74, Invalid=136, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:33:50,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2021-05-02 13:33:50,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 106. [2021-05-02 13:33:50,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 102 states have (on average 1.1666666666666667) internal successors, (119), 102 states have internal predecessors, (119), 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 13:33:50,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 122 transitions. [2021-05-02 13:33:50,961 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 122 transitions. Word has length 36 [2021-05-02 13:33:50,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:50,963 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 122 transitions. [2021-05-02 13:33:50,963 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 5.285714285714286) internal successors, (37), 6 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 13:33:50,963 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 122 transitions. [2021-05-02 13:33:50,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-02 13:33:50,971 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:50,971 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 8, 8, 8, 4, 4, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:51,188 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:51,189 INFO L428 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:51,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:51,189 INFO L82 PathProgramCache]: Analyzing trace with hash 868614671, now seen corresponding path program 4 times [2021-05-02 13:33:51,190 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:51,190 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [282050114] [2021-05-02 13:33:51,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:51,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:51,281 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:51,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:51,288 INFO L134 CoverageAnalysis]: Checked inductivity of 898 backedges. 472 proven. 1 refuted. 0 times theorem prover too weak. 425 trivial. 0 not checked. [2021-05-02 13:33:51,289 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:51,289 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [282050114] [2021-05-02 13:33:51,289 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [282050114] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:51,289 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1424496986] [2021-05-02 13:33:51,289 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 13:33:51,347 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:33:51,347 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:51,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 13:33:51,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:51,382 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:51,385 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:51,397 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:51,399 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:51,414 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:51,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:51,525 INFO L134 CoverageAnalysis]: Checked inductivity of 898 backedges. 196 proven. 9 refuted. 0 times theorem prover too weak. 693 trivial. 0 not checked. [2021-05-02 13:33:51,526 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1424496986] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:51,526 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:51,526 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 9 [2021-05-02 13:33:51,526 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294417939] [2021-05-02 13:33:51,527 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:33:51,527 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:51,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:33:51,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:33:51,528 INFO L87 Difference]: Start difference. First operand 106 states and 122 transitions. Second operand has 9 states, 9 states have (on average 5.0) internal successors, (45), 8 states have internal predecessors, (45), 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 13:33:52,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:52,025 INFO L93 Difference]: Finished difference Result 454 states and 540 transitions. [2021-05-02 13:33:52,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 13:33:52,026 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.0) internal successors, (45), 8 states have internal predecessors, (45), 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 105 [2021-05-02 13:33:52,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:52,027 INFO L225 Difference]: With dead ends: 454 [2021-05-02 13:33:52,028 INFO L226 Difference]: Without dead ends: 356 [2021-05-02 13:33:52,030 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 378.8ms TimeCoverageRelationStatistics Valid=170, Invalid=336, Unknown=0, NotChecked=0, Total=506 [2021-05-02 13:33:52,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 356 states. [2021-05-02 13:33:52,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 356 to 228. [2021-05-02 13:33:52,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 224 states have (on average 1.1383928571428572) internal successors, (255), 224 states have internal predecessors, (255), 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 13:33:52,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 258 transitions. [2021-05-02 13:33:52,078 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 258 transitions. Word has length 105 [2021-05-02 13:33:52,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:52,078 INFO L480 AbstractCegarLoop]: Abstraction has 228 states and 258 transitions. [2021-05-02 13:33:52,079 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 5.0) internal successors, (45), 8 states have internal predecessors, (45), 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 13:33:52,079 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 258 transitions. [2021-05-02 13:33:52,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2021-05-02 13:33:52,080 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:52,080 INFO L523 BasicCegarLoop]: trace histogram [64, 64, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:52,304 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:52,305 INFO L428 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:52,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:52,305 INFO L82 PathProgramCache]: Analyzing trace with hash -1890013545, now seen corresponding path program 5 times [2021-05-02 13:33:52,305 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:52,305 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1618269287] [2021-05-02 13:33:52,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:52,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:52,447 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:52,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:52,455 INFO L134 CoverageAnalysis]: Checked inductivity of 5691 backedges. 656 proven. 16 refuted. 0 times theorem prover too weak. 5019 trivial. 0 not checked. [2021-05-02 13:33:52,456 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:52,456 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1618269287] [2021-05-02 13:33:52,456 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1618269287] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:52,456 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1975289466] [2021-05-02 13:33:52,456 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 13:33:52,523 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-05-02 13:33:52,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:52,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 13:33:52,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:52,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:52,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:52,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:52,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:52,663 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:52,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:52,674 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:52,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:52,855 INFO L134 CoverageAnalysis]: Checked inductivity of 5691 backedges. 2643 proven. 16 refuted. 0 times theorem prover too weak. 3032 trivial. 0 not checked. [2021-05-02 13:33:52,855 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1975289466] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:52,855 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:52,855 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 13:33:52,856 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663794664] [2021-05-02 13:33:52,856 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:33:52,856 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:52,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:33:52,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:33:52,857 INFO L87 Difference]: Start difference. First operand 228 states and 258 transitions. Second operand has 9 states, 9 states have (on average 5.111111111111111) internal successors, (46), 8 states have internal predecessors, (46), 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 13:33:53,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:53,124 INFO L93 Difference]: Finished difference Result 485 states and 560 transitions. [2021-05-02 13:33:53,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:33:53,124 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.111111111111111) internal successors, (46), 8 states have internal predecessors, (46), 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 227 [2021-05-02 13:33:53,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:53,126 INFO L225 Difference]: With dead ends: 485 [2021-05-02 13:33:53,126 INFO L226 Difference]: Without dead ends: 276 [2021-05-02 13:33:53,127 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 228 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 183.2ms TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:33:53,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2021-05-02 13:33:53,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 260. [2021-05-02 13:33:53,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 260 states, 256 states have (on average 1.12109375) internal successors, (287), 256 states have internal predecessors, (287), 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 13:33:53,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 290 transitions. [2021-05-02 13:33:53,165 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 290 transitions. Word has length 227 [2021-05-02 13:33:53,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:53,165 INFO L480 AbstractCegarLoop]: Abstraction has 260 states and 290 transitions. [2021-05-02 13:33:53,165 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 5.111111111111111) internal successors, (46), 8 states have internal predecessors, (46), 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 13:33:53,165 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 290 transitions. [2021-05-02 13:33:53,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 260 [2021-05-02 13:33:53,167 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:53,168 INFO L523 BasicCegarLoop]: trace histogram [80, 80, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:53,381 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-02 13:33:53,381 INFO L428 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:53,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:53,382 INFO L82 PathProgramCache]: Analyzing trace with hash -2032544617, now seen corresponding path program 6 times [2021-05-02 13:33:53,382 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:53,382 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1377684737] [2021-05-02 13:33:53,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:53,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:53,489 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:53,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:53,495 INFO L134 CoverageAnalysis]: Checked inductivity of 8235 backedges. 956 proven. 25 refuted. 0 times theorem prover too weak. 7254 trivial. 0 not checked. [2021-05-02 13:33:53,496 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:53,496 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1377684737] [2021-05-02 13:33:53,496 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1377684737] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:53,496 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1355937387] [2021-05-02 13:33:53,496 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 13:33:53,582 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 24 check-sat command(s) [2021-05-02 13:33:53,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:53,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 13:33:53,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:53,700 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:53,703 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:53,708 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:53,710 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:53,715 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:53,717 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:53,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:53,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:53,729 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:53,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:53,920 INFO L134 CoverageAnalysis]: Checked inductivity of 8235 backedges. 3823 proven. 25 refuted. 0 times theorem prover too weak. 4387 trivial. 0 not checked. [2021-05-02 13:33:53,920 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1355937387] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:53,920 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:53,920 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 13:33:53,920 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409710689] [2021-05-02 13:33:53,921 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:33:53,921 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:53,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:33:53,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:33:53,922 INFO L87 Difference]: Start difference. First operand 260 states and 290 transitions. Second operand has 10 states, 10 states have (on average 4.8) internal successors, (48), 9 states have internal predecessors, (48), 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 13:33:54,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:54,172 INFO L93 Difference]: Finished difference Result 531 states and 606 transitions. [2021-05-02 13:33:54,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:33:54,172 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.8) internal successors, (48), 9 states have internal predecessors, (48), 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 259 [2021-05-02 13:33:54,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:54,174 INFO L225 Difference]: With dead ends: 531 [2021-05-02 13:33:54,174 INFO L226 Difference]: Without dead ends: 292 [2021-05-02 13:33:54,175 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 260 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 184.6ms TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:33:54,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2021-05-02 13:33:54,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 292. [2021-05-02 13:33:54,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 288 states have (on average 1.1076388888888888) internal successors, (319), 288 states have internal predecessors, (319), 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 13:33:54,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 322 transitions. [2021-05-02 13:33:54,207 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 322 transitions. Word has length 259 [2021-05-02 13:33:54,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:54,207 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 322 transitions. [2021-05-02 13:33:54,207 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 4.8) internal successors, (48), 9 states have internal predecessors, (48), 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 13:33:54,207 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 322 transitions. [2021-05-02 13:33:54,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 292 [2021-05-02 13:33:54,210 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:54,210 INFO L523 BasicCegarLoop]: trace histogram [96, 96, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:54,433 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:54,434 INFO L428 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:54,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:54,434 INFO L82 PathProgramCache]: Analyzing trace with hash -319620457, now seen corresponding path program 7 times [2021-05-02 13:33:54,434 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:54,435 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [299335945] [2021-05-02 13:33:54,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:54,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:54,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:54,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:54,544 INFO L134 CoverageAnalysis]: Checked inductivity of 11291 backedges. 2489 proven. 89 refuted. 0 times theorem prover too weak. 8713 trivial. 0 not checked. [2021-05-02 13:33:54,545 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:54,545 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [299335945] [2021-05-02 13:33:54,545 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [299335945] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:54,545 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1953849892] [2021-05-02 13:33:54,545 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 13:33:54,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:54,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 554 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 13:33:54,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:54,703 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:54,705 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:54,729 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:54,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:55,025 INFO L134 CoverageAnalysis]: Checked inductivity of 11291 backedges. 2489 proven. 89 refuted. 0 times theorem prover too weak. 8713 trivial. 0 not checked. [2021-05-02 13:33:55,026 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1953849892] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:55,026 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:55,026 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 13:33:55,026 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [420848844] [2021-05-02 13:33:55,027 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 13:33:55,027 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:55,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 13:33:55,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:33:55,027 INFO L87 Difference]: Start difference. First operand 292 states and 322 transitions. Second operand has 7 states, 7 states have (on average 5.857142857142857) internal successors, (41), 6 states have internal predecessors, (41), 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 13:33:55,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:55,209 INFO L93 Difference]: Finished difference Result 776 states and 857 transitions. [2021-05-02 13:33:55,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:33:55,210 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.857142857142857) internal successors, (41), 6 states have internal predecessors, (41), 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 291 [2021-05-02 13:33:55,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:55,212 INFO L225 Difference]: With dead ends: 776 [2021-05-02 13:33:55,213 INFO L226 Difference]: Without dead ends: 524 [2021-05-02 13:33:55,214 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 292 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 94.8ms TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:33:55,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 524 states. [2021-05-02 13:33:55,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 524 to 412. [2021-05-02 13:33:55,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 412 states, 408 states have (on average 1.0955882352941178) internal successors, (447), 408 states have internal predecessors, (447), 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 13:33:55,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 412 states to 412 states and 450 transitions. [2021-05-02 13:33:55,263 INFO L78 Accepts]: Start accepts. Automaton has 412 states and 450 transitions. Word has length 291 [2021-05-02 13:33:55,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:55,264 INFO L480 AbstractCegarLoop]: Abstraction has 412 states and 450 transitions. [2021-05-02 13:33:55,264 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 5.857142857142857) internal successors, (41), 6 states have internal predecessors, (41), 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 13:33:55,264 INFO L276 IsEmpty]: Start isEmpty. Operand 412 states and 450 transitions. [2021-05-02 13:33:55,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 412 [2021-05-02 13:33:55,269 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:55,269 INFO L523 BasicCegarLoop]: trace histogram [144, 144, 24, 24, 24, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:55,489 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:55,489 INFO L428 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:55,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:55,489 INFO L82 PathProgramCache]: Analyzing trace with hash -1897232105, now seen corresponding path program 8 times [2021-05-02 13:33:55,489 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:55,489 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [201103053] [2021-05-02 13:33:55,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:55,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:55,648 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:55,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:55,661 INFO L134 CoverageAnalysis]: Checked inductivity of 25215 backedges. 5548 proven. 264 refuted. 0 times theorem prover too weak. 19403 trivial. 0 not checked. [2021-05-02 13:33:55,662 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:55,662 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [201103053] [2021-05-02 13:33:55,662 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [201103053] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:55,662 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1335352782] [2021-05-02 13:33:55,662 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:55,808 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:33:55,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:55,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 746 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 13:33:55,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:55,862 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:55,864 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:55,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:55,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:55,913 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:55,915 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:56,295 INFO L134 CoverageAnalysis]: Checked inductivity of 25215 backedges. 5548 proven. 264 refuted. 0 times theorem prover too weak. 19403 trivial. 0 not checked. [2021-05-02 13:33:56,296 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1335352782] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:56,296 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:56,296 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 13:33:56,296 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1569947673] [2021-05-02 13:33:56,297 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:33:56,297 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:56,297 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:33:56,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:33:56,298 INFO L87 Difference]: Start difference. First operand 412 states and 450 transitions. Second operand has 8 states, 8 states have (on average 5.75) internal successors, (46), 7 states have internal predecessors, (46), 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 13:33:56,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:56,546 INFO L93 Difference]: Finished difference Result 1001 states and 1097 transitions. [2021-05-02 13:33:56,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:33:56,546 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.75) internal successors, (46), 7 states have internal predecessors, (46), 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 411 [2021-05-02 13:33:56,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:56,550 INFO L225 Difference]: With dead ends: 1001 [2021-05-02 13:33:56,550 INFO L226 Difference]: Without dead ends: 644 [2021-05-02 13:33:56,552 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 422 GetRequests, 412 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 128.5ms TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:33:56,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 644 states. [2021-05-02 13:33:56,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 644 to 532. [2021-05-02 13:33:56,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 532 states, 528 states have (on average 1.0890151515151516) internal successors, (575), 528 states have internal predecessors, (575), 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 13:33:56,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 532 states to 532 states and 578 transitions. [2021-05-02 13:33:56,615 INFO L78 Accepts]: Start accepts. Automaton has 532 states and 578 transitions. Word has length 411 [2021-05-02 13:33:56,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:56,615 INFO L480 AbstractCegarLoop]: Abstraction has 532 states and 578 transitions. [2021-05-02 13:33:56,615 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 5.75) internal successors, (46), 7 states have internal predecessors, (46), 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 13:33:56,615 INFO L276 IsEmpty]: Start isEmpty. Operand 532 states and 578 transitions. [2021-05-02 13:33:56,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 532 [2021-05-02 13:33:56,623 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:56,623 INFO L523 BasicCegarLoop]: trace histogram [192, 192, 32, 32, 32, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:56,840 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 13:33:56,841 INFO L428 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:56,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:56,841 INFO L82 PathProgramCache]: Analyzing trace with hash 425498519, now seen corresponding path program 9 times [2021-05-02 13:33:56,841 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:56,842 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2080283799] [2021-05-02 13:33:56,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:56,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:56,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:57,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:57,007 INFO L134 CoverageAnalysis]: Checked inductivity of 44707 backedges. 9825 proven. 526 refuted. 0 times theorem prover too weak. 34356 trivial. 0 not checked. [2021-05-02 13:33:57,007 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:57,007 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2080283799] [2021-05-02 13:33:57,007 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2080283799] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:57,008 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2141514352] [2021-05-02 13:33:57,008 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:57,124 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2021-05-02 13:33:57,124 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:57,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 13:33:57,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:57,756 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:57,758 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:57,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:57,779 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:57,798 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:57,800 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:57,818 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:57,819 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:57,833 INFO L134 CoverageAnalysis]: Checked inductivity of 44707 backedges. 9836 proven. 526 refuted. 0 times theorem prover too weak. 34345 trivial. 0 not checked. [2021-05-02 13:33:57,833 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2141514352] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:57,833 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:57,833 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 13:33:57,834 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667815384] [2021-05-02 13:33:57,834 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:33:57,834 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:57,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:33:57,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:33:57,835 INFO L87 Difference]: Start difference. First operand 532 states and 578 transitions. Second operand has 9 states, 9 states have (on average 7.0) internal successors, (63), 8 states have internal predecessors, (63), 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 13:33:58,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:58,123 INFO L93 Difference]: Finished difference Result 1226 states and 1337 transitions. [2021-05-02 13:33:58,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:33:58,124 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 7.0) internal successors, (63), 8 states have internal predecessors, (63), 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 531 [2021-05-02 13:33:58,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:58,127 INFO L225 Difference]: With dead ends: 1226 [2021-05-02 13:33:58,127 INFO L226 Difference]: Without dead ends: 764 [2021-05-02 13:33:58,128 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 544 GetRequests, 532 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 166.5ms TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:33:58,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 764 states. [2021-05-02 13:33:58,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 764 to 652. [2021-05-02 13:33:58,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 652 states, 648 states have (on average 1.0848765432098766) internal successors, (703), 648 states have internal predecessors, (703), 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 13:33:58,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 652 states to 652 states and 706 transitions. [2021-05-02 13:33:58,201 INFO L78 Accepts]: Start accepts. Automaton has 652 states and 706 transitions. Word has length 531 [2021-05-02 13:33:58,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:58,201 INFO L480 AbstractCegarLoop]: Abstraction has 652 states and 706 transitions. [2021-05-02 13:33:58,201 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 7.0) internal successors, (63), 8 states have internal predecessors, (63), 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 13:33:58,201 INFO L276 IsEmpty]: Start isEmpty. Operand 652 states and 706 transitions. [2021-05-02 13:33:58,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 652 [2021-05-02 13:33:58,213 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:58,214 INFO L523 BasicCegarLoop]: trace histogram [240, 240, 40, 40, 40, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:58,430 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 13:33:58,431 INFO L428 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:58,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:58,431 INFO L82 PathProgramCache]: Analyzing trace with hash 307308055, now seen corresponding path program 10 times [2021-05-02 13:33:58,431 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:58,431 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [624477942] [2021-05-02 13:33:58,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:58,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:58,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:58,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:58,637 INFO L134 CoverageAnalysis]: Checked inductivity of 69767 backedges. 15320 proven. 875 refuted. 0 times theorem prover too weak. 53572 trivial. 0 not checked. [2021-05-02 13:33:58,637 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:58,637 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [624477942] [2021-05-02 13:33:58,637 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [624477942] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:58,637 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [157025513] [2021-05-02 13:33:58,637 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:58,862 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:33:58,862 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:58,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 1101 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 13:33:58,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:58,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:58,936 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:58,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:58,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:58,985 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:58,990 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:59,010 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:59,011 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:59,030 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:59,032 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:59,545 INFO L134 CoverageAnalysis]: Checked inductivity of 69767 backedges. 15320 proven. 875 refuted. 0 times theorem prover too weak. 53572 trivial. 0 not checked. [2021-05-02 13:33:59,546 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [157025513] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:59,546 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:59,546 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 13:33:59,546 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885530452] [2021-05-02 13:33:59,546 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:33:59,547 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:59,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:33:59,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:33:59,547 INFO L87 Difference]: Start difference. First operand 652 states and 706 transitions. Second operand has 10 states, 10 states have (on average 5.6) internal successors, (56), 9 states have internal predecessors, (56), 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 13:33:59,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:59,863 INFO L93 Difference]: Finished difference Result 1339 states and 1457 transitions. [2021-05-02 13:33:59,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:33:59,863 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 5.6) internal successors, (56), 9 states have internal predecessors, (56), 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 651 [2021-05-02 13:33:59,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:59,866 INFO L225 Difference]: With dead ends: 1339 [2021-05-02 13:33:59,866 INFO L226 Difference]: Without dead ends: 772 [2021-05-02 13:33:59,868 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 666 GetRequests, 652 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 173.1ms TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:33:59,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 772 states. [2021-05-02 13:33:59,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 772 to 772. [2021-05-02 13:33:59,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 772 states, 768 states have (on average 1.08203125) internal successors, (831), 768 states have internal predecessors, (831), 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 13:33:59,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 772 states to 772 states and 834 transitions. [2021-05-02 13:33:59,947 INFO L78 Accepts]: Start accepts. Automaton has 772 states and 834 transitions. Word has length 651 [2021-05-02 13:33:59,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:59,947 INFO L480 AbstractCegarLoop]: Abstraction has 772 states and 834 transitions. [2021-05-02 13:33:59,948 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 5.6) internal successors, (56), 9 states have internal predecessors, (56), 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 13:33:59,948 INFO L276 IsEmpty]: Start isEmpty. Operand 772 states and 834 transitions. [2021-05-02 13:33:59,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 772 [2021-05-02 13:33:59,967 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:59,967 INFO L523 BasicCegarLoop]: trace histogram [288, 288, 48, 48, 48, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:00,180 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 13:34:00,181 INFO L428 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:00,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:00,181 INFO L82 PathProgramCache]: Analyzing trace with hash 1099707543, now seen corresponding path program 11 times [2021-05-02 13:34:00,181 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:00,182 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [356539703] [2021-05-02 13:34:00,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:00,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:00,427 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:00,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:00,434 INFO L134 CoverageAnalysis]: Checked inductivity of 100395 backedges. 37786 proven. 3149 refuted. 0 times theorem prover too weak. 59460 trivial. 0 not checked. [2021-05-02 13:34:00,434 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:00,434 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [356539703] [2021-05-02 13:34:00,434 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [356539703] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:00,434 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [654562327] [2021-05-02 13:34:00,434 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:00,593 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 83 check-sat command(s) [2021-05-02 13:34:00,594 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:34:00,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 416 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 13:34:00,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:34:00,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:00,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:01,033 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:01,034 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:01,391 INFO L134 CoverageAnalysis]: Checked inductivity of 100395 backedges. 62978 proven. 3149 refuted. 0 times theorem prover too weak. 34268 trivial. 0 not checked. [2021-05-02 13:34:01,392 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [654562327] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:01,392 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:34:01,392 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 13:34:01,392 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225139025] [2021-05-02 13:34:01,393 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 13:34:01,393 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:01,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 13:34:01,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:34:01,394 INFO L87 Difference]: Start difference. First operand 772 states and 834 transitions. Second operand has 7 states, 7 states have (on average 8.571428571428571) internal successors, (60), 6 states have internal predecessors, (60), 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 13:34:01,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:01,702 INFO L93 Difference]: Finished difference Result 2089 states and 2258 transitions. [2021-05-02 13:34:01,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:34:01,702 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 8.571428571428571) internal successors, (60), 6 states have internal predecessors, (60), 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 771 [2021-05-02 13:34:01,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:01,707 INFO L225 Difference]: With dead ends: 2089 [2021-05-02 13:34:01,707 INFO L226 Difference]: Without dead ends: 1512 [2021-05-02 13:34:01,709 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 780 GetRequests, 772 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 90.2ms TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:34:01,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1512 states. [2021-05-02 13:34:01,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1512 to 1144. [2021-05-02 13:34:01,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1144 states, 1140 states have (on average 1.0798245614035087) internal successors, (1231), 1140 states have internal predecessors, (1231), 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 13:34:01,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1144 states to 1144 states and 1234 transitions. [2021-05-02 13:34:01,832 INFO L78 Accepts]: Start accepts. Automaton has 1144 states and 1234 transitions. Word has length 771 [2021-05-02 13:34:01,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:01,832 INFO L480 AbstractCegarLoop]: Abstraction has 1144 states and 1234 transitions. [2021-05-02 13:34:01,833 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 8.571428571428571) internal successors, (60), 6 states have internal predecessors, (60), 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 13:34:01,833 INFO L276 IsEmpty]: Start isEmpty. Operand 1144 states and 1234 transitions. [2021-05-02 13:34:01,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1144 [2021-05-02 13:34:01,843 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:01,844 INFO L523 BasicCegarLoop]: trace histogram [432, 432, 72, 72, 72, 12, 12, 12, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:02,056 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 13:34:02,057 INFO L428 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:02,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:02,057 INFO L82 PathProgramCache]: Analyzing trace with hash -1050458793, now seen corresponding path program 12 times [2021-05-02 13:34:02,057 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:02,058 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [838818470] [2021-05-02 13:34:02,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:02,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:02,425 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:02,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:02,436 INFO L134 CoverageAnalysis]: Checked inductivity of 226105 backedges. 84997 proven. 9444 refuted. 0 times theorem prover too weak. 131664 trivial. 0 not checked. [2021-05-02 13:34:02,436 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:02,437 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [838818470] [2021-05-02 13:34:02,437 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [838818470] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:02,437 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [149356813] [2021-05-02 13:34:02,437 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:02,986 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 193 check-sat command(s) [2021-05-02 13:34:02,986 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:34:02,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 1031 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 13:34:03,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:34:04,038 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:04,040 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:04,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:04,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:04,243 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:04,244 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:04,260 INFO L134 CoverageAnalysis]: Checked inductivity of 226105 backedges. 85001 proven. 9444 refuted. 0 times theorem prover too weak. 131660 trivial. 0 not checked. [2021-05-02 13:34:04,260 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [149356813] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:04,260 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:34:04,260 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 13:34:04,261 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366471198] [2021-05-02 13:34:04,261 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:34:04,262 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:04,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:34:04,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:34:04,262 INFO L87 Difference]: Start difference. First operand 1144 states and 1234 transitions. Second operand has 8 states, 8 states have (on average 8.75) internal successors, (70), 7 states have internal predecessors, (70), 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 13:34:04,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:04,643 INFO L93 Difference]: Finished difference Result 2740 states and 2958 transitions. [2021-05-02 13:34:04,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:34:04,644 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 8.75) internal successors, (70), 7 states have internal predecessors, (70), 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 1143 [2021-05-02 13:34:04,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:04,650 INFO L225 Difference]: With dead ends: 2740 [2021-05-02 13:34:04,650 INFO L226 Difference]: Without dead ends: 1884 [2021-05-02 13:34:04,652 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 1154 GetRequests, 1144 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 138.5ms TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:34:04,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1884 states. [2021-05-02 13:34:04,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1884 to 1516. [2021-05-02 13:34:04,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1516 states, 1512 states have (on average 1.0787037037037037) internal successors, (1631), 1512 states have internal predecessors, (1631), 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 13:34:04,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1516 states to 1516 states and 1634 transitions. [2021-05-02 13:34:04,823 INFO L78 Accepts]: Start accepts. Automaton has 1516 states and 1634 transitions. Word has length 1143 [2021-05-02 13:34:04,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:04,823 INFO L480 AbstractCegarLoop]: Abstraction has 1516 states and 1634 transitions. [2021-05-02 13:34:04,824 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 8.75) internal successors, (70), 7 states have internal predecessors, (70), 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 13:34:04,824 INFO L276 IsEmpty]: Start isEmpty. Operand 1516 states and 1634 transitions. [2021-05-02 13:34:04,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1516 [2021-05-02 13:34:04,841 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:04,842 INFO L523 BasicCegarLoop]: trace histogram [576, 576, 96, 96, 96, 16, 16, 16, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:05,054 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 13:34:05,054 INFO L428 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:05,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:05,055 INFO L82 PathProgramCache]: Analyzing trace with hash -295917545, now seen corresponding path program 13 times [2021-05-02 13:34:05,055 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:05,055 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1914131234] [2021-05-02 13:34:05,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:05,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:05,585 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:05,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:05,600 INFO L134 CoverageAnalysis]: Checked inductivity of 402167 backedges. 151090 proven. 18886 refuted. 0 times theorem prover too weak. 232191 trivial. 0 not checked. [2021-05-02 13:34:05,601 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:05,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1914131234] [2021-05-02 13:34:05,601 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1914131234] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:05,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [344294592] [2021-05-02 13:34:05,601 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:06,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:06,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 2522 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 13:34:06,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:34:06,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:06,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:06,239 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:06,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:06,339 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:06,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:06,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:06,439 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:07,482 INFO L134 CoverageAnalysis]: Checked inductivity of 402167 backedges. 151090 proven. 18886 refuted. 0 times theorem prover too weak. 232191 trivial. 0 not checked. [2021-05-02 13:34:07,482 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [344294592] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:07,482 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:34:07,482 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 13:34:07,483 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786754520] [2021-05-02 13:34:07,483 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:34:07,484 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:07,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:34:07,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:34:07,484 INFO L87 Difference]: Start difference. First operand 1516 states and 1634 transitions. Second operand has 9 states, 9 states have (on average 7.222222222222222) internal successors, (65), 8 states have internal predecessors, (65), 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 13:34:07,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:07,856 INFO L93 Difference]: Finished difference Result 3391 states and 3658 transitions. [2021-05-02 13:34:07,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:34:07,857 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 7.222222222222222) internal successors, (65), 8 states have internal predecessors, (65), 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 1515 [2021-05-02 13:34:07,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:07,864 INFO L225 Difference]: With dead ends: 3391 [2021-05-02 13:34:07,864 INFO L226 Difference]: Without dead ends: 2256 [2021-05-02 13:34:07,866 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 1528 GetRequests, 1516 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 133.2ms TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:34:07,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2256 states. [2021-05-02 13:34:08,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2256 to 1888. [2021-05-02 13:34:08,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1888 states, 1884 states have (on average 1.0780254777070064) internal successors, (2031), 1884 states have internal predecessors, (2031), 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 13:34:08,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1888 states to 1888 states and 2034 transitions. [2021-05-02 13:34:08,055 INFO L78 Accepts]: Start accepts. Automaton has 1888 states and 2034 transitions. Word has length 1515 [2021-05-02 13:34:08,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:08,056 INFO L480 AbstractCegarLoop]: Abstraction has 1888 states and 2034 transitions. [2021-05-02 13:34:08,056 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 7.222222222222222) internal successors, (65), 8 states have internal predecessors, (65), 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 13:34:08,056 INFO L276 IsEmpty]: Start isEmpty. Operand 1888 states and 2034 transitions. [2021-05-02 13:34:08,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1888 [2021-05-02 13:34:08,079 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:08,080 INFO L523 BasicCegarLoop]: trace histogram [720, 720, 120, 120, 120, 20, 20, 20, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:08,280 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:08,281 INFO L428 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:08,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:08,281 INFO L82 PathProgramCache]: Analyzing trace with hash 221392087, now seen corresponding path program 14 times [2021-05-02 13:34:08,281 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:08,281 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1503230421] [2021-05-02 13:34:08,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:08,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:08,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:08,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:08,985 INFO L134 CoverageAnalysis]: Checked inductivity of 628581 backedges. 236065 proven. 31475 refuted. 0 times theorem prover too weak. 361041 trivial. 0 not checked. [2021-05-02 13:34:08,986 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:08,986 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1503230421] [2021-05-02 13:34:08,986 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1503230421] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:08,986 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [116150960] [2021-05-02 13:34:08,986 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:09,432 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:34:09,433 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:34:09,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 3122 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 13:34:09,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:34:09,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:09,611 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:09,711 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:09,714 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:09,816 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:09,817 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:09,915 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:09,916 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:10,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:10,020 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:11,265 INFO L134 CoverageAnalysis]: Checked inductivity of 628581 backedges. 236065 proven. 31475 refuted. 0 times theorem prover too weak. 361041 trivial. 0 not checked. [2021-05-02 13:34:11,265 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [116150960] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:11,265 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:34:11,266 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 13:34:11,266 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [11230699] [2021-05-02 13:34:11,267 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:34:11,267 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:11,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:34:11,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:34:11,267 INFO L87 Difference]: Start difference. First operand 1888 states and 2034 transitions. Second operand has 10 states, 10 states have (on average 7.3) internal successors, (73), 9 states have internal predecessors, (73), 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 13:34:11,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:11,667 INFO L93 Difference]: Finished difference Result 3674 states and 3962 transitions. [2021-05-02 13:34:11,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:34:11,668 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 7.3) internal successors, (73), 9 states have internal predecessors, (73), 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 1887 [2021-05-02 13:34:11,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:11,674 INFO L225 Difference]: With dead ends: 3674 [2021-05-02 13:34:11,674 INFO L226 Difference]: Without dead ends: 2260 [2021-05-02 13:34:11,678 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 1902 GetRequests, 1888 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 167.9ms TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:34:11,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2260 states. [2021-05-02 13:34:11,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2260 to 2260. [2021-05-02 13:34:11,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2260 states, 2256 states have (on average 1.0775709219858156) internal successors, (2431), 2256 states have internal predecessors, (2431), 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 13:34:11,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2260 states to 2260 states and 2434 transitions. [2021-05-02 13:34:11,920 INFO L78 Accepts]: Start accepts. Automaton has 2260 states and 2434 transitions. Word has length 1887 [2021-05-02 13:34:11,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:11,921 INFO L480 AbstractCegarLoop]: Abstraction has 2260 states and 2434 transitions. [2021-05-02 13:34:11,921 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 7.3) internal successors, (73), 9 states have internal predecessors, (73), 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 13:34:11,921 INFO L276 IsEmpty]: Start isEmpty. Operand 2260 states and 2434 transitions. [2021-05-02 13:34:11,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2260 [2021-05-02 13:34:11,955 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:11,956 INFO L523 BasicCegarLoop]: trace histogram [864, 864, 144, 144, 144, 24, 24, 24, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:12,156 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:12,157 INFO L428 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:12,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:12,157 INFO L82 PathProgramCache]: Analyzing trace with hash -1650812009, now seen corresponding path program 15 times [2021-05-02 13:34:12,157 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:12,157 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1720724615] [2021-05-02 13:34:12,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:12,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:13,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:13,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:13,132 INFO L134 CoverageAnalysis]: Checked inductivity of 905347 backedges. 453235 proven. 113309 refuted. 0 times theorem prover too weak. 338803 trivial. 0 not checked. [2021-05-02 13:34:13,132 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:13,132 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1720724615] [2021-05-02 13:34:13,132 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1720724615] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:13,132 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1676905963] [2021-05-02 13:34:13,132 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:14,907 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 377 check-sat command(s) [2021-05-02 13:34:14,907 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:34:14,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 2387 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 13:34:14,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:34:17,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:17,663 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:17,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:17,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:17,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:17,768 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:17,811 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:17,813 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:17,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:17,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:17,913 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:17,946 INFO L134 CoverageAnalysis]: Checked inductivity of 905347 backedges. 582727 proven. 0 refuted. 0 times theorem prover too weak. 322620 trivial. 0 not checked. [2021-05-02 13:34:17,947 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1676905963] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:34:17,947 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:34:17,947 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [6] total 21 [2021-05-02 13:34:17,947 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325750473] [2021-05-02 13:34:17,948 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 13:34:17,948 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:17,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 13:34:17,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2021-05-02 13:34:17,949 INFO L87 Difference]: Start difference. First operand 2260 states and 2434 transitions. Second operand has 17 states, 17 states have (on average 3.5294117647058822) internal successors, (60), 17 states have internal predecessors, (60), 1 states have call successors, (2), 1 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 13:34:18,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:18,349 INFO L93 Difference]: Finished difference Result 2260 states and 2434 transitions. [2021-05-02 13:34:18,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 13:34:18,350 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.5294117647058822) internal successors, (60), 17 states have internal predecessors, (60), 1 states have call successors, (2), 1 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 2259 [2021-05-02 13:34:18,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:18,354 INFO L225 Difference]: With dead ends: 2260 [2021-05-02 13:34:18,354 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 13:34:18,357 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 2265 GetRequests, 2246 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 251.7ms TimeCoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2021-05-02 13:34:18,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 13:34:18,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 13:34:18,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-02 13:34:18,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 13:34:18,359 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 2259 [2021-05-02 13:34:18,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:18,359 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 13:34:18,359 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 3.5294117647058822) internal successors, (60), 17 states have internal predecessors, (60), 1 states have call successors, (2), 1 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 13:34:18,359 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 13:34:18,359 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 13:34:18,584 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-05-02 13:34:18,586 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-05-02 13:34:20,075 WARN L205 SmtUtils]: Spent 1.39 s on a formula simplification. DAG size of input: 566 DAG size of output: 100 [2021-05-02 13:34:49,025 WARN L205 SmtUtils]: Spent 28.94 s on a formula simplification. DAG size of input: 3330 DAG size of output: 554 [2021-05-02 13:34:49,334 WARN L205 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 15 [2021-05-02 13:34:53,574 WARN L205 SmtUtils]: Spent 4.23 s on a formula simplification. DAG size of input: 509 DAG size of output: 14 [2021-05-02 13:34:53,698 INFO L198 CegarLoopUtils]: For program point reach_errorEXIT(line 13) no Hoare annotation was computed. [2021-05-02 13:34:53,698 INFO L198 CegarLoopUtils]: For program point reach_errorENTRY(line 13) no Hoare annotation was computed. [2021-05-02 13:34:53,698 INFO L198 CegarLoopUtils]: For program point reach_errorFINAL(line 13) no Hoare annotation was computed. [2021-05-02 13:34:53,698 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2021-05-02 13:34:53,698 INFO L194 CegarLoopUtils]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#t~string5.base| |old(#t~string5.base)|) (= |#t~string5.offset| |old(#t~string5.offset)|) (= |old(#length)| |#length|) (= |#t~string6.base| |old(#t~string6.base)|) (= |#t~string6.offset| |old(#t~string6.offset)|) (= |#t~string4.base| |old(#t~string4.base)|) (= |#NULL.base| |old(#NULL.base)|) (= |#t~string4.offset| |old(#t~string4.offset)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|)) [2021-05-02 13:34:53,698 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2021-05-02 13:34:53,698 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-05-02 13:34:53,698 INFO L201 CegarLoopUtils]: At program point L-1(line -1) the Hoare annotation is: true [2021-05-02 13:34:53,698 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2021-05-02 13:34:53,698 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2021-05-02 13:34:53,699 INFO L198 CegarLoopUtils]: For program point L27-2(lines 27 29) no Hoare annotation was computed. [2021-05-02 13:34:53,699 INFO L198 CegarLoopUtils]: For program point mainEXIT(lines 15 38) no Hoare annotation was computed. [2021-05-02 13:34:53,699 INFO L194 CegarLoopUtils]: At program point L27-3(lines 27 29) the Hoare annotation is: (and (<= main_~c~0 5) (< main_~b~0 6) (<= main_~d~0 5) (< main_~e~0 7) (< main_~a~0 6)) [2021-05-02 13:34:53,699 INFO L198 CegarLoopUtils]: For program point L23-2(lines 23 33) no Hoare annotation was computed. [2021-05-02 13:34:53,699 INFO L194 CegarLoopUtils]: At program point L23-3(lines 23 33) the Hoare annotation is: (and (<= 6 main_~c~0) (< main_~d~0 7) (<= 6 main_~d~0) (<= 6 main_~e~0) (< main_~a~0 7) (< main_~e~0 7) (< main_~b~0 7) (<= 6 main_~b~0) (< main_~c~0 7)) [2021-05-02 13:34:53,699 INFO L198 CegarLoopUtils]: For program point L23-4(lines 15 38) no Hoare annotation was computed. [2021-05-02 13:34:53,699 INFO L198 CegarLoopUtils]: For program point L24-2(lines 24 32) no Hoare annotation was computed. [2021-05-02 13:34:53,699 INFO L194 CegarLoopUtils]: At program point L24-3(lines 24 32) the Hoare annotation is: (and (<= 6 main_~c~0) (< main_~d~0 7) (<= 6 main_~d~0) (<= 6 main_~e~0) (< main_~e~0 7) (< main_~b~0 7) (< main_~a~0 6) (< main_~c~0 7)) [2021-05-02 13:34:53,699 INFO L198 CegarLoopUtils]: For program point L25-2(lines 25 31) no Hoare annotation was computed. [2021-05-02 13:34:53,699 INFO L194 CegarLoopUtils]: At program point L25-3(lines 25 31) the Hoare annotation is: (and (< main_~b~0 6) (< main_~d~0 7) (<= 6 main_~d~0) (<= 6 main_~e~0) (< main_~e~0 7) (< main_~a~0 6) (< main_~c~0 7)) [2021-05-02 13:34:53,699 INFO L198 CegarLoopUtils]: For program point mainFINAL(lines 15 38) no Hoare annotation was computed. [2021-05-02 13:34:53,699 INFO L198 CegarLoopUtils]: For program point L34-1(lines 34 36) no Hoare annotation was computed. [2021-05-02 13:34:53,700 INFO L198 CegarLoopUtils]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 35) no Hoare annotation was computed. [2021-05-02 13:34:53,700 INFO L201 CegarLoopUtils]: At program point mainENTRY(lines 15 38) the Hoare annotation is: true [2021-05-02 13:34:53,700 INFO L198 CegarLoopUtils]: For program point L26-2(lines 26 30) no Hoare annotation was computed. [2021-05-02 13:34:53,700 INFO L194 CegarLoopUtils]: At program point L26-3(lines 26 30) the Hoare annotation is: (and (<= main_~c~0 5) (< main_~b~0 6) (< main_~d~0 7) (<= 6 main_~e~0) (< main_~e~0 7) (< main_~a~0 6)) [2021-05-02 13:34:53,700 INFO L198 CegarLoopUtils]: For program point L35(line 35) no Hoare annotation was computed. [2021-05-02 13:34:53,721 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 01:34:53 BoogieIcfgContainer [2021-05-02 13:34:53,721 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 13:34:53,722 INFO L168 Benchmark]: Toolchain (without parser) took 67073.59 ms. Allocated memory was 185.6 MB in the beginning and 1.6 GB in the end (delta: 1.4 GB). Free memory was 149.6 MB in the beginning and 1.1 GB in the end (delta: -927.3 MB). Peak memory consumption was 1.0 GB. Max. memory is 8.0 GB. [2021-05-02 13:34:53,722 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 185.6 MB. Free memory is still 166.2 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 13:34:53,722 INFO L168 Benchmark]: CACSL2BoogieTranslator took 249.53 ms. Allocated memory is still 185.6 MB. Free memory was 149.4 MB in the beginning and 168.4 MB in the end (delta: -18.9 MB). Peak memory consumption was 11.0 MB. Max. memory is 8.0 GB. [2021-05-02 13:34:53,724 INFO L168 Benchmark]: Boogie Preprocessor took 44.50 ms. Allocated memory is still 185.6 MB. Free memory was 168.4 MB in the beginning and 166.8 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-02 13:34:53,725 INFO L168 Benchmark]: RCFGBuilder took 375.02 ms. Allocated memory is still 185.6 MB. Free memory was 166.8 MB in the beginning and 152.1 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2021-05-02 13:34:53,725 INFO L168 Benchmark]: TraceAbstraction took 66397.10 ms. Allocated memory was 185.6 MB in the beginning and 1.6 GB in the end (delta: 1.4 GB). Free memory was 151.6 MB in the beginning and 1.1 GB in the end (delta: -925.3 MB). Peak memory consumption was 1.0 GB. Max. memory is 8.0 GB. [2021-05-02 13:34:53,725 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 ms. Allocated memory is still 185.6 MB. Free memory is still 166.2 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 249.53 ms. Allocated memory is still 185.6 MB. Free memory was 149.4 MB in the beginning and 168.4 MB in the end (delta: -18.9 MB). Peak memory consumption was 11.0 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 44.50 ms. Allocated memory is still 185.6 MB. Free memory was 168.4 MB in the beginning and 166.8 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 375.02 ms. Allocated memory is still 185.6 MB. Free memory was 166.8 MB in the beginning and 152.1 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 66397.10 ms. Allocated memory was 185.6 MB in the beginning and 1.6 GB in the end (delta: 1.4 GB). Free memory was 151.6 MB in the beginning and 1.1 GB in the end (delta: -925.3 MB). Peak memory consumption was 1.0 GB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 35]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 31175.5ms, OverallIterations: 21, TraceHistogramMax: 864, EmptinessCheckTime: 153.9ms, AutomataDifference: 5491.3ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 35112.2ms, InitialAbstractionConstructionTime: 7.7ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 407 SDtfs, 1128 SDslu, 317 SDs, 0 SdLazy, 1365 SolverSat, 177 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1199.7ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 10363 GetRequests, 10157 SyntacticMatches, 0 SemanticMatches, 206 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 507 ImplicationChecksByTransitivity, 3108.3ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=2260occurred in iteration=20, InterpolantAutomatonStates: 160, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 1233.3ms AutomataMinimizationTime, 21 MinimizatonAttempts, 1728 StatesRemovedByMinimization, 16 NontrivialMinimizations, HoareAnnotationStatistics: 0.0ms HoareAnnotationTime, 9 LocationsWithAnnotation, 9 PreInvPairs, 1222 NumberOfFragments, 144 HoareAnnotationTreeSize, 9 FomulaSimplifications, 148106240 FormulaSimplificationTreeSizeReduction, 30466.4ms HoareSimplificationTime, 9 FomulaSimplificationsInter, 119402 FormulaSimplificationTreeSizeReductionInter, 4622.1ms HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 910.6ms SsaConstructionTime, 4478.6ms SatisfiabilityAnalysisTime, 15016.3ms InterpolantComputationTime, 20352 NumberOfCodeBlocks, 17614 NumberOfCodeBlocksAsserted, 756 NumberOfCheckSat, 20316 ConstructedInterpolants, 0 QuantifiedInterpolants, 34582 SizeOfPredicates, 5 NumberOfNonLiveVariables, 12908 ConjunctsInSsa, 88 ConjunctsInUnsatCore, 36 InterpolantComputations, 7 PerfectInterpolantSequences, 4614108/4856934 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 25]: Loop Invariant Derived loop invariant: (((((b < 6 && d < 7) && 6 <= d) && 6 <= e) && e < 7) && a < 6) && c < 7 - InvariantResult [Line: 26]: Loop Invariant Derived loop invariant: ((((c <= 5 && b < 6) && d < 7) && 6 <= e) && e < 7) && a < 6 - InvariantResult [Line: 27]: Loop Invariant Derived loop invariant: (((c <= 5 && b < 6) && d <= 5) && e < 7) && a < 6 - InvariantResult [Line: 23]: Loop Invariant Derived loop invariant: (((((((6 <= c && d < 7) && 6 <= d) && 6 <= e) && a < 7) && e < 7) && b < 7) && 6 <= b) && c < 7 - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: ((((((6 <= c && d < 7) && 6 <= d) && 6 <= e) && e < 7) && b < 7) && a < 6) && c < 7 RESULT: Ultimate proved your program to be correct! Received shutdown request...