/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/deep-nested.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 13:31:10,406 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 13:31:10,409 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 13:31:10,448 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 13:31:10,532 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 13:31:10,567 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 13:31:10,567 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 13:31:10,568 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 13:31:10,569 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 13:31:10,569 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 13:31:10,569 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 13:31:10,569 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 13:31:10,569 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 13:31:10,569 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 13:31:10,570 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 13:31:10,570 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 13:31:10,570 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 13:31:10,570 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 13:31:10,570 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 13:31:10,570 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 13:31:10,570 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 13:31:10,571 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 13:31:10,571 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 13:31:10,571 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 13:31:10,571 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 13:31:10,571 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:31:10,571 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 13:31:10,571 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 13:31:10,572 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 13:31:10,572 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 13:31:10,572 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 13:31:10,572 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 13:31:10,572 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 13:31:10,572 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 13:31:10,909 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 13:31:10,935 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 13:31:10,937 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 13:31:10,938 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 13:31:10,939 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 13:31:10,939 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-simple/deep-nested.c [2021-05-02 13:31:11,017 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/db14a1e2c/76f1944c770246d79e19a6c90c2dcecc/FLAGdcdf5895d [2021-05-02 13:31:11,417 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 13:31:11,418 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/deep-nested.c [2021-05-02 13:31:11,423 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/db14a1e2c/76f1944c770246d79e19a6c90c2dcecc/FLAGdcdf5895d [2021-05-02 13:31:11,831 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/db14a1e2c/76f1944c770246d79e19a6c90c2dcecc [2021-05-02 13:31:11,834 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 13:31:11,836 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 13:31:11,840 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 13:31:11,840 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 13:31:11,843 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 13:31:11,844 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:31:11" (1/1) ... [2021-05-02 13:31:11,845 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2c538d9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:31:11, skipping insertion in model container [2021-05-02 13:31:11,845 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:31:11" (1/1) ... [2021-05-02 13:31:11,855 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 13:31:11,867 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 13:31:11,971 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/deep-nested.c[625,638] [2021-05-02 13:31:11,978 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:31:11,986 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 13:31:12,000 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/deep-nested.c[625,638] [2021-05-02 13:31:12,001 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:31:12,014 INFO L208 MainTranslator]: Completed translation [2021-05-02 13:31:12,015 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:31:12 WrapperNode [2021-05-02 13:31:12,015 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 13:31:12,016 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 13:31:12,016 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 13:31:12,016 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 13:31:12,061 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:31:12" (1/1) ... [2021-05-02 13:31:12,062 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:31:12" (1/1) ... [2021-05-02 13:31:12,078 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:31:12" (1/1) ... [2021-05-02 13:31:12,078 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:31:12" (1/1) ... [2021-05-02 13:31:12,092 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:31:12" (1/1) ... [2021-05-02 13:31:12,096 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:31:12" (1/1) ... [2021-05-02 13:31:12,097 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:31:12" (1/1) ... [2021-05-02 13:31:12,098 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 13:31:12,099 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 13:31:12,099 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 13:31:12,099 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 13:31:12,100 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:31:12" (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 13:31:12,175 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 13:31:12,175 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 13:31:12,176 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 13:31:12,176 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 13:31:12,176 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 13:31:12,176 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 13:31:12,176 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 13:31:12,177 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 13:31:12,177 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 13:31:12,177 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 13:31:12,177 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 13:31:12,177 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 13:31:12,178 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 13:31:12,178 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 13:31:12,475 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 13:31:12,475 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2021-05-02 13:31:12,476 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:31:12 BoogieIcfgContainer [2021-05-02 13:31:12,477 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 13:31:12,478 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 13:31:12,478 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 13:31:12,480 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 13:31:12,480 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 01:31:11" (1/3) ... [2021-05-02 13:31:12,481 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c79bc14 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:31:12, skipping insertion in model container [2021-05-02 13:31:12,481 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:31:12" (2/3) ... [2021-05-02 13:31:12,481 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c79bc14 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:31:12, skipping insertion in model container [2021-05-02 13:31:12,481 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:31:12" (3/3) ... [2021-05-02 13:31:12,482 INFO L111 eAbstractionObserver]: Analyzing ICFG deep-nested.c [2021-05-02 13:31:12,491 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 13:31:12,494 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 13:31:12,532 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 13:31:12,552 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 13:31:12,552 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 13:31:12,552 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 13:31:12,552 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 13:31:12,553 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 13:31:12,553 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 13:31:12,553 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 13:31:12,553 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 13:31:12,566 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 13:31:12,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 13:31:12,576 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:12,577 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:12,577 INFO L428 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:12,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:12,583 INFO L82 PathProgramCache]: Analyzing trace with hash 764687304, now seen corresponding path program 1 times [2021-05-02 13:31:12,590 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:12,590 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657157739] [2021-05-02 13:31:12,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:12,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:12,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:31:12,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:12,897 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 13:31:12,897 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:12,898 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657157739] [2021-05-02 13:31:12,899 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [657157739] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:31:12,899 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:31:12,900 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 13:31:12,900 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183609661] [2021-05-02 13:31:12,904 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 13:31:12,904 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:12,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 13:31:12,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:31:12,916 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 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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 13:31:13,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:13,111 INFO L93 Difference]: Finished difference Result 45 states and 68 transitions. [2021-05-02 13:31:13,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 13:31:13,112 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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 13 [2021-05-02 13:31:13,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:13,118 INFO L225 Difference]: With dead ends: 45 [2021-05-02 13:31:13,119 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 13:31:13,121 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 146.0ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:31:13,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 13:31:13,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-05-02 13:31:13,157 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 13:31:13,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-05-02 13:31:13,158 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2021-05-02 13:31:13,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:13,159 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-05-02 13:31:13,159 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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 13:31:13,159 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-05-02 13:31:13,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-02 13:31:13,160 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:13,160 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:13,160 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 13:31:13,160 INFO L428 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:13,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:13,161 INFO L82 PathProgramCache]: Analyzing trace with hash 296825287, now seen corresponding path program 1 times [2021-05-02 13:31:13,161 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:13,161 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [736680060] [2021-05-02 13:31:13,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:13,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:13,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:31:13,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:13,370 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:31:13,370 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:13,370 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [736680060] [2021-05-02 13:31:13,371 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [736680060] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:13,371 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2128171456] [2021-05-02 13:31:13,371 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 13:31:13,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:13,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 13:31:13,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:31:13,607 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:31:13,608 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2128171456] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:13,608 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:31:13,608 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 9 [2021-05-02 13:31:13,609 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091583306] [2021-05-02 13:31:13,610 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:31:13,610 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:13,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:31:13,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:31:13,615 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 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 13:31:14,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:14,245 INFO L93 Difference]: Finished difference Result 60 states and 78 transitions. [2021-05-02 13:31:14,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 13:31:14,246 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 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 16 [2021-05-02 13:31:14,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:14,247 INFO L225 Difference]: With dead ends: 60 [2021-05-02 13:31:14,247 INFO L226 Difference]: Without dead ends: 58 [2021-05-02 13:31:14,248 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 473.1ms TimeCoverageRelationStatistics Valid=76, Invalid=164, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:31:14,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-02 13:31:14,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 29. [2021-05-02 13:31:14,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 25 states have (on average 1.32) internal successors, (33), 25 states have internal predecessors, (33), 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 13:31:14,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2021-05-02 13:31:14,257 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 16 [2021-05-02 13:31:14,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:14,257 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2021-05-02 13:31:14,257 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 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 13:31:14,258 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2021-05-02 13:31:14,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 13:31:14,258 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:14,259 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:14,483 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 13:31:14,484 INFO L428 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:14,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:14,485 INFO L82 PathProgramCache]: Analyzing trace with hash -1896155711, now seen corresponding path program 1 times [2021-05-02 13:31:14,485 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:14,485 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1988404706] [2021-05-02 13:31:14,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:14,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:14,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:31:14,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:14,766 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 1 proven. 14 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-02 13:31:14,766 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:14,767 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1988404706] [2021-05-02 13:31:14,767 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1988404706] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:14,767 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1625297340] [2021-05-02 13:31:14,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:14,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:14,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 13:31:14,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:31:14,939 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:14,961 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 13:31:14,961 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1625297340] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:14,961 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:31:14,962 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 13 [2021-05-02 13:31:14,962 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793004414] [2021-05-02 13:31:14,962 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 13:31:14,962 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:14,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 13:31:14,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-05-02 13:31:14,963 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:31:15,538 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 53 [2021-05-02 13:31:16,171 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 51 [2021-05-02 13:31:16,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:16,217 INFO L93 Difference]: Finished difference Result 92 states and 119 transitions. [2021-05-02 13:31:16,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 13:31:16,218 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-05-02 13:31:16,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:16,220 INFO L225 Difference]: With dead ends: 92 [2021-05-02 13:31:16,220 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 13:31:16,221 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 1111.7ms TimeCoverageRelationStatistics Valid=157, Invalid=493, Unknown=0, NotChecked=0, Total=650 [2021-05-02 13:31:16,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 13:31:16,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 35. [2021-05-02 13:31:16,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 31 states have (on average 1.1935483870967742) internal successors, (37), 31 states have internal predecessors, (37), 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 13:31:16,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 40 transitions. [2021-05-02 13:31:16,238 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 40 transitions. Word has length 25 [2021-05-02 13:31:16,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:16,238 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 40 transitions. [2021-05-02 13:31:16,238 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:31:16,238 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 40 transitions. [2021-05-02 13:31:16,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 13:31:16,239 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:16,239 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:16,462 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:16,462 INFO L428 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:16,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:16,463 INFO L82 PathProgramCache]: Analyzing trace with hash -201502367, now seen corresponding path program 2 times [2021-05-02 13:31:16,463 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:16,463 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [804318489] [2021-05-02 13:31:16,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:16,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:16,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:31:16,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:16,639 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 10 proven. 24 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-05-02 13:31:16,639 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:16,640 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [804318489] [2021-05-02 13:31:16,640 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [804318489] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:16,640 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [476893026] [2021-05-02 13:31:16,640 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:16,692 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-05-02 13:31:16,693 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:31:16,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 13:31:16,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:31:16,804 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-05-02 13:31:16,804 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [476893026] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:31:16,804 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:31:16,805 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [7] total 8 [2021-05-02 13:31:16,805 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386635104] [2021-05-02 13:31:16,805 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 13:31:16,805 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:16,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 13:31:16,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:31:16,806 INFO L87 Difference]: Start difference. First operand 35 states and 40 transitions. Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 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 13:31:16,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:16,867 INFO L93 Difference]: Finished difference Result 64 states and 74 transitions. [2021-05-02 13:31:16,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 13:31:16,868 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 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 31 [2021-05-02 13:31:16,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:16,869 INFO L225 Difference]: With dead ends: 64 [2021-05-02 13:31:16,869 INFO L226 Difference]: Without dead ends: 62 [2021-05-02 13:31:16,869 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 81.1ms TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:31:16,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-02 13:31:16,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 53. [2021-05-02 13:31:16,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 49 states have (on average 1.2040816326530612) internal successors, (59), 49 states have internal predecessors, (59), 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 13:31:16,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 62 transitions. [2021-05-02 13:31:16,882 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 62 transitions. Word has length 31 [2021-05-02 13:31:16,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:16,883 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 62 transitions. [2021-05-02 13:31:16,883 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 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 13:31:16,883 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 62 transitions. [2021-05-02 13:31:16,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 13:31:16,884 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:16,884 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:17,084 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:17,084 INFO L428 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:17,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:17,085 INFO L82 PathProgramCache]: Analyzing trace with hash 60151215, now seen corresponding path program 1 times [2021-05-02 13:31:17,085 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:17,085 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [998869098] [2021-05-02 13:31:17,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:17,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:17,261 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:31:17,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:17,270 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-05-02 13:31:17,270 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:17,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [998869098] [2021-05-02 13:31:17,270 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [998869098] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:17,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [964733988] [2021-05-02 13:31:17,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:17,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:17,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 13:31:17,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:31:17,542 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 27 proven. 9 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-05-02 13:31:17,542 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [964733988] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:17,543 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:31:17,543 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-05-02 13:31:17,543 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959313634] [2021-05-02 13:31:17,544 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 13:31:17,544 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:17,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 13:31:17,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:31:17,546 INFO L87 Difference]: Start difference. First operand 53 states and 62 transitions. Second operand has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 11 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 13:31:19,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:19,047 INFO L93 Difference]: Finished difference Result 213 states and 258 transitions. [2021-05-02 13:31:19,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 13:31:19,047 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 11 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 34 [2021-05-02 13:31:19,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:19,049 INFO L225 Difference]: With dead ends: 213 [2021-05-02 13:31:19,049 INFO L226 Difference]: Without dead ends: 166 [2021-05-02 13:31:19,050 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 258 ImplicationChecksByTransitivity, 1302.4ms TimeCoverageRelationStatistics Valid=266, Invalid=856, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 13:31:19,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-05-02 13:31:19,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 90. [2021-05-02 13:31:19,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 86 states have (on average 1.197674418604651) internal successors, (103), 86 states have internal predecessors, (103), 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 13:31:19,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 106 transitions. [2021-05-02 13:31:19,066 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 106 transitions. Word has length 34 [2021-05-02 13:31:19,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:19,066 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 106 transitions. [2021-05-02 13:31:19,066 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 11 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 13:31:19,066 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 106 transitions. [2021-05-02 13:31:19,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 13:31:19,068 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:19,068 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:19,280 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:19,281 INFO L428 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:19,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:19,281 INFO L82 PathProgramCache]: Analyzing trace with hash -433028043, now seen corresponding path program 1 times [2021-05-02 13:31:19,281 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:19,281 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [183974820] [2021-05-02 13:31:19,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:19,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:19,459 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:31:19,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:19,464 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-05-02 13:31:19,465 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:19,465 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [183974820] [2021-05-02 13:31:19,465 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [183974820] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:19,465 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1823007202] [2021-05-02 13:31:19,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 13:31:19,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:19,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 13:31:19,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:31:19,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:19,653 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 13:31:19,654 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1823007202] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:19,654 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:31:19,654 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-05-02 13:31:19,654 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560271317] [2021-05-02 13:31:19,654 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 13:31:19,654 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:19,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 13:31:19,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:31:19,655 INFO L87 Difference]: Start difference. First operand 90 states and 106 transitions. Second operand has 12 states, 12 states have (on average 3.75) internal successors, (45), 11 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 13:31:20,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:20,974 INFO L93 Difference]: Finished difference Result 343 states and 406 transitions. [2021-05-02 13:31:20,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 13:31:20,975 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.75) internal successors, (45), 11 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 46 [2021-05-02 13:31:20,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:20,976 INFO L225 Difference]: With dead ends: 343 [2021-05-02 13:31:20,976 INFO L226 Difference]: Without dead ends: 245 [2021-05-02 13:31:20,977 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 1132.8ms TimeCoverageRelationStatistics Valid=276, Invalid=914, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 13:31:20,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2021-05-02 13:31:20,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 125. [2021-05-02 13:31:20,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 121 states have (on average 1.1818181818181819) internal successors, (143), 121 states have internal predecessors, (143), 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 13:31:20,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 146 transitions. [2021-05-02 13:31:20,998 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 146 transitions. Word has length 46 [2021-05-02 13:31:20,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:20,998 INFO L480 AbstractCegarLoop]: Abstraction has 125 states and 146 transitions. [2021-05-02 13:31:20,998 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.75) internal successors, (45), 11 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 13:31:20,998 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 146 transitions. [2021-05-02 13:31:21,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-05-02 13:31:21,001 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:21,001 INFO L523 BasicCegarLoop]: trace histogram [21, 20, 20, 7, 6, 6, 6, 5, 5, 5, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:21,223 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 13:31:21,224 INFO L428 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:21,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:21,224 INFO L82 PathProgramCache]: Analyzing trace with hash -223154552, now seen corresponding path program 1 times [2021-05-02 13:31:21,224 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:21,224 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1760180004] [2021-05-02 13:31:21,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:21,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:21,607 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:31:21,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:21,612 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 28 proven. 226 refuted. 0 times theorem prover too weak. 664 trivial. 0 not checked. [2021-05-02 13:31:21,612 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:21,612 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1760180004] [2021-05-02 13:31:21,613 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1760180004] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:21,613 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [824608648] [2021-05-02 13:31:21,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 13:31:21,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:21,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 13:31:21,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:31:21,883 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:21,991 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 416 proven. 60 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2021-05-02 13:31:21,991 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [824608648] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:21,993 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:31:21,993 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 17 [2021-05-02 13:31:21,993 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916594591] [2021-05-02 13:31:21,994 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 13:31:21,994 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:21,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 13:31:21,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2021-05-02 13:31:21,995 INFO L87 Difference]: Start difference. First operand 125 states and 146 transitions. Second operand has 17 states, 17 states have (on average 5.0) internal successors, (85), 16 states have internal predecessors, (85), 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 13:31:24,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:24,163 INFO L93 Difference]: Finished difference Result 641 states and 784 transitions. [2021-05-02 13:31:24,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 13:31:24,163 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 5.0) internal successors, (85), 16 states have internal predecessors, (85), 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 124 [2021-05-02 13:31:24,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:24,165 INFO L225 Difference]: With dead ends: 641 [2021-05-02 13:31:24,166 INFO L226 Difference]: Without dead ends: 483 [2021-05-02 13:31:24,167 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 389 ImplicationChecksByTransitivity, 1711.2ms TimeCoverageRelationStatistics Valid=311, Invalid=1411, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 13:31:24,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 483 states. [2021-05-02 13:31:24,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 483 to 319. [2021-05-02 13:31:24,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 319 states, 315 states have (on average 1.1365079365079365) internal successors, (358), 315 states have internal predecessors, (358), 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 13:31:24,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 361 transitions. [2021-05-02 13:31:24,212 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 361 transitions. Word has length 124 [2021-05-02 13:31:24,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:24,212 INFO L480 AbstractCegarLoop]: Abstraction has 319 states and 361 transitions. [2021-05-02 13:31:24,212 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 5.0) internal successors, (85), 16 states have internal predecessors, (85), 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 13:31:24,212 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 361 transitions. [2021-05-02 13:31:24,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 281 [2021-05-02 13:31:24,216 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:24,216 INFO L523 BasicCegarLoop]: trace histogram [58, 57, 57, 12, 11, 11, 11, 10, 10, 10, 9, 9, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:24,419 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:24,420 INFO L428 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:24,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:24,420 INFO L82 PathProgramCache]: Analyzing trace with hash 2040532169, now seen corresponding path program 2 times [2021-05-02 13:31:24,420 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:24,420 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1105301578] [2021-05-02 13:31:24,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:24,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:25,044 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:31:25,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:25,053 INFO L134 CoverageAnalysis]: Checked inductivity of 6222 backedges. 53 proven. 990 refuted. 0 times theorem prover too weak. 5179 trivial. 0 not checked. [2021-05-02 13:31:25,053 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:25,053 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1105301578] [2021-05-02 13:31:25,053 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1105301578] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:25,055 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1283503694] [2021-05-02 13:31:25,055 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 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 13:31:25,193 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:31:25,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:31:25,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 521 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 13:31:25,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:31:25,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:25,629 INFO L134 CoverageAnalysis]: Checked inductivity of 6222 backedges. 985 proven. 18 refuted. 0 times theorem prover too weak. 5219 trivial. 0 not checked. [2021-05-02 13:31:25,629 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1283503694] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:25,629 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:31:25,629 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7] total 17 [2021-05-02 13:31:25,629 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904803941] [2021-05-02 13:31:25,630 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 13:31:25,630 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:25,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 13:31:25,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-05-02 13:31:25,631 INFO L87 Difference]: Start difference. First operand 319 states and 361 transitions. Second operand has 17 states, 17 states have (on average 4.294117647058823) internal successors, (73), 16 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 13:31:27,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:27,908 INFO L93 Difference]: Finished difference Result 1451 states and 1694 transitions. [2021-05-02 13:31:27,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 13:31:27,909 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 4.294117647058823) internal successors, (73), 16 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 280 [2021-05-02 13:31:27,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:27,912 INFO L225 Difference]: With dead ends: 1451 [2021-05-02 13:31:27,912 INFO L226 Difference]: Without dead ends: 1045 [2021-05-02 13:31:27,915 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 279 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 366 ImplicationChecksByTransitivity, 1821.8ms TimeCoverageRelationStatistics Valid=322, Invalid=1400, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 13:31:27,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1045 states. [2021-05-02 13:31:27,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1045 to 623. [2021-05-02 13:31:27,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 623 states, 619 states have (on average 1.0775444264943457) internal successors, (667), 619 states have internal predecessors, (667), 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 13:31:27,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 623 states to 623 states and 670 transitions. [2021-05-02 13:31:27,984 INFO L78 Accepts]: Start accepts. Automaton has 623 states and 670 transitions. Word has length 280 [2021-05-02 13:31:27,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:27,985 INFO L480 AbstractCegarLoop]: Abstraction has 623 states and 670 transitions. [2021-05-02 13:31:27,985 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 4.294117647058823) internal successors, (73), 16 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 13:31:27,985 INFO L276 IsEmpty]: Start isEmpty. Operand 623 states and 670 transitions. [2021-05-02 13:31:27,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 623 [2021-05-02 13:31:27,995 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:27,995 INFO L523 BasicCegarLoop]: trace histogram [161, 160, 160, 23, 22, 22, 11, 10, 10, 10, 9, 9, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:28,208 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:28,209 INFO L428 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:28,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:28,209 INFO L82 PathProgramCache]: Analyzing trace with hash 1960519738, now seen corresponding path program 3 times [2021-05-02 13:31:28,209 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:28,210 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [444122321] [2021-05-02 13:31:28,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:28,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:29,479 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:31:29,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:29,498 INFO L134 CoverageAnalysis]: Checked inductivity of 43353 backedges. 64 proven. 3772 refuted. 0 times theorem prover too weak. 39517 trivial. 0 not checked. [2021-05-02 13:31:29,498 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:29,498 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [444122321] [2021-05-02 13:31:29,498 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [444122321] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:29,498 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1741004631] [2021-05-02 13:31:29,498 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 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 13:31:29,627 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 13:31:29,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:31:29,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 13:31:29,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:31:30,705 INFO L134 CoverageAnalysis]: Checked inductivity of 43353 backedges. 14589 proven. 956 refuted. 0 times theorem prover too weak. 27808 trivial. 0 not checked. [2021-05-02 13:31:30,705 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1741004631] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:30,705 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:31:30,705 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 5] total 17 [2021-05-02 13:31:30,707 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1625638217] [2021-05-02 13:31:30,708 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 13:31:30,708 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:30,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 13:31:30,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-02 13:31:30,709 INFO L87 Difference]: Start difference. First operand 623 states and 670 transitions. Second operand has 17 states, 17 states have (on average 4.823529411764706) internal successors, (82), 16 states have internal predecessors, (82), 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 13:31:33,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:33,041 INFO L93 Difference]: Finished difference Result 3250 states and 3573 transitions. [2021-05-02 13:31:33,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 13:31:33,042 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 4.823529411764706) internal successors, (82), 16 states have internal predecessors, (82), 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 622 [2021-05-02 13:31:33,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:33,050 INFO L225 Difference]: With dead ends: 3250 [2021-05-02 13:31:33,050 INFO L226 Difference]: Without dead ends: 2636 [2021-05-02 13:31:33,052 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 667 GetRequests, 621 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 1955.3ms TimeCoverageRelationStatistics Valid=433, Invalid=1729, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 13:31:33,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2636 states. [2021-05-02 13:31:33,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2636 to 1394. [2021-05-02 13:31:33,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1394 states, 1390 states have (on average 1.056115107913669) internal successors, (1468), 1390 states have internal predecessors, (1468), 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 13:31:33,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1394 states to 1394 states and 1471 transitions. [2021-05-02 13:31:33,195 INFO L78 Accepts]: Start accepts. Automaton has 1394 states and 1471 transitions. Word has length 622 [2021-05-02 13:31:33,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:33,195 INFO L480 AbstractCegarLoop]: Abstraction has 1394 states and 1471 transitions. [2021-05-02 13:31:33,196 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 4.823529411764706) internal successors, (82), 16 states have internal predecessors, (82), 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 13:31:33,196 INFO L276 IsEmpty]: Start isEmpty. Operand 1394 states and 1471 transitions. [2021-05-02 13:31:33,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1394 [2021-05-02 13:31:33,253 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:33,254 INFO L523 BasicCegarLoop]: trace histogram [388, 387, 387, 43, 42, 42, 21, 20, 20, 10, 9, 9, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:33,468 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-05-02 13:31:33,469 INFO L428 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:33,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:33,469 INFO L82 PathProgramCache]: Analyzing trace with hash 1034667073, now seen corresponding path program 4 times [2021-05-02 13:31:33,470 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:33,470 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476262166] [2021-05-02 13:31:33,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:36,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:37,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:31:37,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:37,391 INFO L134 CoverageAnalysis]: Checked inductivity of 245549 backedges. 104 proven. 11508 refuted. 0 times theorem prover too weak. 233937 trivial. 0 not checked. [2021-05-02 13:31:37,391 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:37,391 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1476262166] [2021-05-02 13:31:37,393 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1476262166] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:37,394 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2120897655] [2021-05-02 13:31:37,394 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 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 13:31:37,880 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:31:37,881 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:31:37,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 2087 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 13:31:37,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:31:38,164 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:39,537 INFO L134 CoverageAnalysis]: Checked inductivity of 245549 backedges. 21804 proven. 320 refuted. 0 times theorem prover too weak. 223425 trivial. 0 not checked. [2021-05-02 13:31:39,538 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2120897655] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:39,538 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:31:39,538 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 9] total 23 [2021-05-02 13:31:39,538 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811461318] [2021-05-02 13:31:39,540 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 13:31:39,540 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:39,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 13:31:39,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=440, Unknown=0, NotChecked=0, Total=506 [2021-05-02 13:31:39,541 INFO L87 Difference]: Start difference. First operand 1394 states and 1471 transitions. Second operand has 23 states, 23 states have (on average 4.086956521739131) internal successors, (94), 22 states have internal predecessors, (94), 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 13:31:44,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:44,357 INFO L93 Difference]: Finished difference Result 4673 states and 5073 transitions. [2021-05-02 13:31:44,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 13:31:44,357 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 4.086956521739131) internal successors, (94), 22 states have internal predecessors, (94), 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 1393 [2021-05-02 13:31:44,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:44,365 INFO L225 Difference]: With dead ends: 4673 [2021-05-02 13:31:44,365 INFO L226 Difference]: Without dead ends: 3213 [2021-05-02 13:31:44,368 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 1459 GetRequests, 1390 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1306 ImplicationChecksByTransitivity, 3776.2ms TimeCoverageRelationStatistics Valid=635, Invalid=4335, Unknown=0, NotChecked=0, Total=4970 [2021-05-02 13:31:44,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3213 states. [2021-05-02 13:31:44,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3213 to 2405. [2021-05-02 13:31:44,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2405 states, 2401 states have (on average 1.0412328196584757) internal successors, (2500), 2401 states have internal predecessors, (2500), 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 13:31:44,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2405 states to 2405 states and 2503 transitions. [2021-05-02 13:31:44,655 INFO L78 Accepts]: Start accepts. Automaton has 2405 states and 2503 transitions. Word has length 1393 [2021-05-02 13:31:44,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:44,655 INFO L480 AbstractCegarLoop]: Abstraction has 2405 states and 2503 transitions. [2021-05-02 13:31:44,656 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 4.086956521739131) internal successors, (94), 22 states have internal predecessors, (94), 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 13:31:44,656 INFO L276 IsEmpty]: Start isEmpty. Operand 2405 states and 2503 transitions. [2021-05-02 13:31:44,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2405 [2021-05-02 13:31:44,696 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:44,696 INFO L523 BasicCegarLoop]: trace histogram [704, 703, 703, 64, 63, 63, 21, 20, 20, 10, 9, 9, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:44,923 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:44,923 INFO L428 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:44,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:44,924 INFO L82 PathProgramCache]: Analyzing trace with hash 462099815, now seen corresponding path program 5 times [2021-05-02 13:31:44,924 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:44,924 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1961576290] [2021-05-02 13:31:44,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:49,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:50,772 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:31:50,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:50,806 INFO L134 CoverageAnalysis]: Checked inductivity of 794140 backedges. 125 proven. 25163 refuted. 0 times theorem prover too weak. 768852 trivial. 0 not checked. [2021-05-02 13:31:50,806 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:50,806 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1961576290] [2021-05-02 13:31:50,806 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1961576290] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:50,806 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1649806098] [2021-05-02 13:31:50,806 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 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 13:35:50,760 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 60 check-sat command(s) [2021-05-02 13:35:50,760 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:35:50,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 63 conjunts are in the unsatisfiable core [2021-05-02 13:35:50,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:35:52,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:54,447 INFO L134 CoverageAnalysis]: Checked inductivity of 794140 backedges. 199381 proven. 1519 refuted. 0 times theorem prover too weak. 593240 trivial. 0 not checked. [2021-05-02 13:35:54,448 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1649806098] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:35:54,448 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:35:54,448 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 32] total 48 [2021-05-02 13:35:54,449 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [61327113] [2021-05-02 13:35:54,451 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-02 13:35:54,451 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:35:54,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-02 13:35:54,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2112, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 13:35:54,452 INFO L87 Difference]: Start difference. First operand 2405 states and 2503 transitions. Second operand has 48 states, 48 states have (on average 3.5416666666666665) internal successors, (170), 47 states have internal predecessors, (170), 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 13:36:00,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:36:00,070 INFO L93 Difference]: Finished difference Result 6061 states and 6432 transitions. [2021-05-02 13:36:00,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 13:36:00,070 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 3.5416666666666665) internal successors, (170), 47 states have internal predecessors, (170), 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 2404 [2021-05-02 13:36:00,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:36:00,079 INFO L225 Difference]: With dead ends: 6061 [2021-05-02 13:36:00,079 INFO L226 Difference]: Without dead ends: 3410 [2021-05-02 13:36:00,086 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 2472 GetRequests, 2378 SyntacticMatches, 2 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2640 ImplicationChecksByTransitivity, 4783.4ms TimeCoverageRelationStatistics Valid=665, Invalid=8077, Unknown=0, NotChecked=0, Total=8742 [2021-05-02 13:36:00,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3410 states. [2021-05-02 13:36:00,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3410 to 2663. [2021-05-02 13:36:00,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2663 states, 2659 states have (on average 1.037232042121098) internal successors, (2758), 2659 states have internal predecessors, (2758), 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 13:36:00,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2663 states to 2663 states and 2761 transitions. [2021-05-02 13:36:00,384 INFO L78 Accepts]: Start accepts. Automaton has 2663 states and 2761 transitions. Word has length 2404 [2021-05-02 13:36:00,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:36:00,385 INFO L480 AbstractCegarLoop]: Abstraction has 2663 states and 2761 transitions. [2021-05-02 13:36:00,385 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 3.5416666666666665) internal successors, (170), 47 states have internal predecessors, (170), 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 13:36:00,385 INFO L276 IsEmpty]: Start isEmpty. Operand 2663 states and 2761 transitions. [2021-05-02 13:36:00,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2663 [2021-05-02 13:36:00,434 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:36:00,435 INFO L523 BasicCegarLoop]: trace histogram [790, 789, 789, 64, 63, 63, 21, 20, 20, 10, 9, 9, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:36:00,652 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:36:00,652 INFO L428 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:36:00,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:36:00,653 INFO L82 PathProgramCache]: Analyzing trace with hash -1141509725, now seen corresponding path program 6 times [2021-05-02 13:36:00,653 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:36:00,653 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1921352963] [2021-05-02 13:36:00,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:36:05,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:36:07,578 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:36:07,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:36:07,612 INFO L134 CoverageAnalysis]: Checked inductivity of 992069 backedges. 125 proven. 30567 refuted. 0 times theorem prover too weak. 961377 trivial. 0 not checked. [2021-05-02 13:36:07,612 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:36:07,613 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1921352963] [2021-05-02 13:36:07,613 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1921352963] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:36:07,613 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1443743927] [2021-05-02 13:36:07,613 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 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 13:36:16,917 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2021-05-02 13:36:16,917 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:36:16,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 415 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-02 13:36:16,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:36:21,341 INFO L134 CoverageAnalysis]: Checked inductivity of 992069 backedges. 502138 proven. 353 refuted. 0 times theorem prover too weak. 489578 trivial. 0 not checked. [2021-05-02 13:36:21,341 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1443743927] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:36:21,341 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:36:21,342 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17] total 34 [2021-05-02 13:36:21,342 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2011686016] [2021-05-02 13:36:21,343 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 13:36:21,343 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:36:21,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 13:36:21,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=952, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 13:36:21,344 INFO L87 Difference]: Start difference. First operand 2663 states and 2761 transitions. Second operand has 34 states, 34 states have (on average 3.8823529411764706) internal successors, (132), 33 states have internal predecessors, (132), 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 13:36:22,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:36:22,666 INFO L93 Difference]: Finished difference Result 5727 states and 6031 transitions. [2021-05-02 13:36:22,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 13:36:22,666 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 3.8823529411764706) internal successors, (132), 33 states have internal predecessors, (132), 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 2662 [2021-05-02 13:36:22,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:36:22,673 INFO L225 Difference]: With dead ends: 5727 [2021-05-02 13:36:22,673 INFO L226 Difference]: Without dead ends: 3111 [2021-05-02 13:36:22,677 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 2698 GetRequests, 2645 SyntacticMatches, 5 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 498 ImplicationChecksByTransitivity, 1385.6ms TimeCoverageRelationStatistics Valid=359, Invalid=2091, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 13:36:22,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3111 states. [2021-05-02 13:36:23,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3111 to 2984. [2021-05-02 13:36:23,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2984 states, 2980 states have (on average 1.0332214765100671) internal successors, (3079), 2980 states have internal predecessors, (3079), 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 13:36:23,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2984 states to 2984 states and 3082 transitions. [2021-05-02 13:36:23,041 INFO L78 Accepts]: Start accepts. Automaton has 2984 states and 3082 transitions. Word has length 2662 [2021-05-02 13:36:23,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:36:23,042 INFO L480 AbstractCegarLoop]: Abstraction has 2984 states and 3082 transitions. [2021-05-02 13:36:23,042 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 3.8823529411764706) internal successors, (132), 33 states have internal predecessors, (132), 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 13:36:23,042 INFO L276 IsEmpty]: Start isEmpty. Operand 2984 states and 3082 transitions. [2021-05-02 13:36:23,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2984 [2021-05-02 13:36:23,118 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:36:23,118 INFO L523 BasicCegarLoop]: trace histogram [897, 896, 896, 64, 63, 63, 21, 20, 20, 10, 9, 9, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:36:23,319 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 13:36:23,319 INFO L428 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:36:23,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:36:23,320 INFO L82 PathProgramCache]: Analyzing trace with hash 1384224164, now seen corresponding path program 7 times [2021-05-02 13:36:23,320 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:36:23,320 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1198728072] [2021-05-02 13:36:23,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:36:28,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:36:31,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:36:31,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:36:31,101 INFO L134 CoverageAnalysis]: Checked inductivity of 1269306 backedges. 125 proven. 40054 refuted. 0 times theorem prover too weak. 1229127 trivial. 0 not checked. [2021-05-02 13:36:31,102 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:36:31,102 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1198728072] [2021-05-02 13:36:31,102 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1198728072] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:36:31,102 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1842315094] [2021-05-02 13:36:31,102 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 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 13:36:31,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:36:31,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 4249 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 13:36:31,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:36:32,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:36:35,192 INFO L134 CoverageAnalysis]: Checked inductivity of 1269306 backedges. 215883 proven. 5873 refuted. 0 times theorem prover too weak. 1047550 trivial. 0 not checked. [2021-05-02 13:36:35,193 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1842315094] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:36:35,193 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:36:35,193 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 9] total 28 [2021-05-02 13:36:35,194 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2066669409] [2021-05-02 13:36:35,195 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 13:36:35,195 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:36:35,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 13:36:35,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=670, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:36:35,196 INFO L87 Difference]: Start difference. First operand 2984 states and 3082 transitions. Second operand has 28 states, 28 states have (on average 4.107142857142857) internal successors, (115), 27 states have internal predecessors, (115), 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 13:36:37,156 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 52 [2021-05-02 13:36:43,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:36:43,053 INFO L93 Difference]: Finished difference Result 9556 states and 10078 transitions. [2021-05-02 13:36:43,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-05-02 13:36:43,054 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 4.107142857142857) internal successors, (115), 27 states have internal predecessors, (115), 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 2983 [2021-05-02 13:36:43,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:36:43,067 INFO L225 Difference]: With dead ends: 9556 [2021-05-02 13:36:43,067 INFO L226 Difference]: Without dead ends: 6523 [2021-05-02 13:36:43,074 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 3074 GetRequests, 2980 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2531 ImplicationChecksByTransitivity, 6139.7ms TimeCoverageRelationStatistics Valid=915, Invalid=8205, Unknown=0, NotChecked=0, Total=9120 [2021-05-02 13:36:43,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6523 states. [2021-05-02 13:36:43,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6523 to 6221. [2021-05-02 13:36:43,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6221 states, 6217 states have (on average 1.02814862473862) internal successors, (6392), 6217 states have internal predecessors, (6392), 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 13:36:43,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6221 states to 6221 states and 6395 transitions. [2021-05-02 13:36:43,664 INFO L78 Accepts]: Start accepts. Automaton has 6221 states and 6395 transitions. Word has length 2983 [2021-05-02 13:36:43,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:36:43,665 INFO L480 AbstractCegarLoop]: Abstraction has 6221 states and 6395 transitions. [2021-05-02 13:36:43,665 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 4.107142857142857) internal successors, (115), 27 states have internal predecessors, (115), 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 13:36:43,665 INFO L276 IsEmpty]: Start isEmpty. Operand 6221 states and 6395 transitions. [2021-05-02 13:36:43,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4916 [2021-05-02 13:36:43,856 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:36:43,857 INFO L523 BasicCegarLoop]: trace histogram [1501, 1500, 1500, 94, 93, 93, 31, 30, 30, 10, 9, 9, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:36:44,058 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 13:36:44,058 INFO L428 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:36:44,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:36:44,059 INFO L82 PathProgramCache]: Analyzing trace with hash 679291420, now seen corresponding path program 8 times [2021-05-02 13:36:44,059 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:36:44,059 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [738282972] [2021-05-02 13:36:44,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:37:00,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:37:04,578 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:37:04,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:37:04,657 INFO L134 CoverageAnalysis]: Checked inductivity of 3532846 backedges. 175 proven. 76173 refuted. 0 times theorem prover too weak. 3456498 trivial. 0 not checked. [2021-05-02 13:37:04,657 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:37:04,657 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [738282972] [2021-05-02 13:37:04,658 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [738282972] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:37:04,658 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [999724450] [2021-05-02 13:37:04,658 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 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 13:37:06,145 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:37:06,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:37:06,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 6905 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 13:37:06,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:37:13,159 INFO L134 CoverageAnalysis]: Checked inductivity of 3532846 backedges. 29811 proven. 2315896 refuted. 0 times theorem prover too weak. 1187139 trivial. 0 not checked. [2021-05-02 13:37:13,160 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [999724450] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:37:13,160 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:37:13,160 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 11] total 32 [2021-05-02 13:37:13,161 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478134672] [2021-05-02 13:37:13,163 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 13:37:13,163 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:37:13,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 13:37:13,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=892, Unknown=0, NotChecked=0, Total=992 [2021-05-02 13:37:13,164 INFO L87 Difference]: Start difference. First operand 6221 states and 6395 transitions. Second operand has 32 states, 32 states have (on average 4.34375) internal successors, (139), 31 states have internal predecessors, (139), 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 13:37:23,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:37:23,780 INFO L93 Difference]: Finished difference Result 16468 states and 17210 transitions. [2021-05-02 13:37:23,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-05-02 13:37:23,781 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 4.34375) internal successors, (139), 31 states have internal predecessors, (139), 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 4915 [2021-05-02 13:37:23,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:37:23,802 INFO L225 Difference]: With dead ends: 16468 [2021-05-02 13:37:23,803 INFO L226 Difference]: Without dead ends: 9714 [2021-05-02 13:37:23,812 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 5019 GetRequests, 4909 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3731 ImplicationChecksByTransitivity, 7433.8ms TimeCoverageRelationStatistics Valid=1066, Invalid=11366, Unknown=0, NotChecked=0, Total=12432 [2021-05-02 13:37:23,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9714 states. [2021-05-02 13:37:24,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9714 to 6707. [2021-05-02 13:37:24,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6707 states, 6703 states have (on average 1.0267044606892437) internal successors, (6882), 6703 states have internal predecessors, (6882), 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 13:37:24,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6707 states to 6707 states and 6885 transitions. [2021-05-02 13:37:24,455 INFO L78 Accepts]: Start accepts. Automaton has 6707 states and 6885 transitions. Word has length 4915 [2021-05-02 13:37:24,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:37:24,456 INFO L480 AbstractCegarLoop]: Abstraction has 6707 states and 6885 transitions. [2021-05-02 13:37:24,456 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 4.34375) internal successors, (139), 31 states have internal predecessors, (139), 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 13:37:24,456 INFO L276 IsEmpty]: Start isEmpty. Operand 6707 states and 6885 transitions. [2021-05-02 13:37:24,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6707 [2021-05-02 13:37:24,765 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:37:24,766 INFO L523 BasicCegarLoop]: trace histogram [2058, 2057, 2057, 121, 120, 120, 40, 39, 39, 13, 12, 12, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:37:24,967 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 13:37:24,967 INFO L428 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:37:24,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:37:24,968 INFO L82 PathProgramCache]: Analyzing trace with hash 283196335, now seen corresponding path program 9 times [2021-05-02 13:37:24,969 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:37:24,969 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1089182358] [2021-05-02 13:37:24,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:37:58,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:38:06,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:38:06,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:38:07,095 INFO L134 CoverageAnalysis]: Checked inductivity of 6624124 backedges. 228 proven. 110722 refuted. 0 times theorem prover too weak. 6513174 trivial. 0 not checked. [2021-05-02 13:38:07,095 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:38:07,095 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1089182358] [2021-05-02 13:38:07,096 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1089182358] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:38:07,096 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [749558655] [2021-05-02 13:38:07,096 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 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 13:38:20,733 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-05-02 13:38:20,733 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:38:20,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 461 conjuncts, 47 conjunts are in the unsatisfiable core [2021-05-02 13:38:20,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:38:31,269 INFO L134 CoverageAnalysis]: Checked inductivity of 6624124 backedges. 1283172 proven. 442 refuted. 0 times theorem prover too weak. 5340510 trivial. 0 not checked. [2021-05-02 13:38:31,270 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [749558655] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:38:31,270 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:38:31,271 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 22] total 44 [2021-05-02 13:38:31,271 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235726768] [2021-05-02 13:38:31,274 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 13:38:31,274 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:38:31,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 13:38:31,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=1662, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 13:38:31,275 INFO L87 Difference]: Start difference. First operand 6707 states and 6885 transitions. Second operand has 44 states, 44 states have (on average 3.590909090909091) internal successors, (158), 43 states have internal predecessors, (158), 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 13:38:33,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:38:33,688 INFO L93 Difference]: Finished difference Result 14319 states and 14918 transitions. [2021-05-02 13:38:33,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 13:38:33,689 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 3.590909090909091) internal successors, (158), 43 states have internal predecessors, (158), 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 6706 [2021-05-02 13:38:33,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:38:33,701 INFO L225 Difference]: With dead ends: 14319 [2021-05-02 13:38:33,701 INFO L226 Difference]: Without dead ends: 7674 [2021-05-02 13:38:33,712 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6752 GetRequests, 6689 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 758 ImplicationChecksByTransitivity, 2057.9ms TimeCoverageRelationStatistics Valid=484, Invalid=3676, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 13:38:33,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7674 states. [2021-05-02 13:38:34,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7674 to 7433. [2021-05-02 13:38:34,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7433 states, 7429 states have (on average 1.024094763763629) internal successors, (7608), 7429 states have internal predecessors, (7608), 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 13:38:34,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7433 states to 7433 states and 7611 transitions. [2021-05-02 13:38:34,424 INFO L78 Accepts]: Start accepts. Automaton has 7433 states and 7611 transitions. Word has length 6706 [2021-05-02 13:38:34,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:38:34,425 INFO L480 AbstractCegarLoop]: Abstraction has 7433 states and 7611 transitions. [2021-05-02 13:38:34,425 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 3.590909090909091) internal successors, (158), 43 states have internal predecessors, (158), 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 13:38:34,425 INFO L276 IsEmpty]: Start isEmpty. Operand 7433 states and 7611 transitions. [2021-05-02 13:38:34,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7433 [2021-05-02 13:38:34,738 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:38:34,740 INFO L523 BasicCegarLoop]: trace histogram [2300, 2299, 2299, 121, 120, 120, 40, 39, 39, 13, 12, 12, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:38:34,940 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:38:34,941 INFO L428 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:38:34,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:38:34,942 INFO L82 PathProgramCache]: Analyzing trace with hash 817510927, now seen corresponding path program 10 times [2021-05-02 13:38:34,942 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:38:34,942 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [912723041] [2021-05-02 13:38:34,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:39:19,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:39:29,384 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:39:29,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:39:29,574 INFO L134 CoverageAnalysis]: Checked inductivity of 8234513 backedges. 228 proven. 137471 refuted. 0 times theorem prover too weak. 8096814 trivial. 0 not checked. [2021-05-02 13:39:29,575 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:39:29,575 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [912723041] [2021-05-02 13:39:29,575 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [912723041] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:39:29,575 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1209064115] [2021-05-02 13:39:29,575 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 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 13:39:35,650 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:39:35,651 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:39:35,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 10341 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 13:39:35,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:39:37,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:44,481 INFO L134 CoverageAnalysis]: Checked inductivity of 8234513 backedges. 2397869 proven. 41459 refuted. 0 times theorem prover too weak. 5795185 trivial. 0 not checked. [2021-05-02 13:39:44,481 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1209064115] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:39:44,481 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:39:44,482 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 13] total 37 [2021-05-02 13:39:44,482 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1003262999] [2021-05-02 13:39:44,485 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 13:39:44,485 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:39:44,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 13:39:44,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1215, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 13:39:44,486 INFO L87 Difference]: Start difference. First operand 7433 states and 7611 transitions. Second operand has 37 states, 37 states have (on average 4.351351351351352) internal successors, (161), 36 states have internal predecessors, (161), 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 13:40:00,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:40:00,256 INFO L93 Difference]: Finished difference Result 21181 states and 21989 transitions. [2021-05-02 13:40:00,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2021-05-02 13:40:00,257 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 4.351351351351352) internal successors, (161), 36 states have internal predecessors, (161), 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 7432 [2021-05-02 13:40:00,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:40:00,276 INFO L225 Difference]: With dead ends: 21181 [2021-05-02 13:40:00,277 INFO L226 Difference]: Without dead ends: 13134 [2021-05-02 13:40:00,289 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7574 GetRequests, 7428 SyntacticMatches, 0 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6840 ImplicationChecksByTransitivity, 10841.0ms TimeCoverageRelationStatistics Valid=1427, Invalid=20329, Unknown=0, NotChecked=0, Total=21756 [2021-05-02 13:40:00,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13134 states. [2021-05-02 13:40:01,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13134 to 10316. [2021-05-02 13:40:01,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10316 states, 10312 states have (on average 1.0212373933281613) internal successors, (10531), 10312 states have internal predecessors, (10531), 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 13:40:01,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10316 states to 10316 states and 10534 transitions. [2021-05-02 13:40:01,316 INFO L78 Accepts]: Start accepts. Automaton has 10316 states and 10534 transitions. Word has length 7432 [2021-05-02 13:40:01,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:40:01,317 INFO L480 AbstractCegarLoop]: Abstraction has 10316 states and 10534 transitions. [2021-05-02 13:40:01,317 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 4.351351351351352) internal successors, (161), 36 states have internal predecessors, (161), 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 13:40:01,318 INFO L276 IsEmpty]: Start isEmpty. Operand 10316 states and 10534 transitions. [2021-05-02 13:40:02,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10316 [2021-05-02 13:40:02,029 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:40:02,031 INFO L523 BasicCegarLoop]: trace histogram [3221, 3220, 3220, 161, 160, 160, 40, 39, 39, 13, 12, 12, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:40:02,232 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 13:40:02,233 INFO L428 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:40:02,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:40:02,235 INFO L82 PathProgramCache]: Analyzing trace with hash -784667232, now seen corresponding path program 11 times [2021-05-02 13:40:02,235 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:40:02,235 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1210741880] [2021-05-02 13:40:02,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:41:55,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:42:11,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:42:11,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:42:12,046 INFO L134 CoverageAnalysis]: Checked inductivity of 16117172 backedges. 268 proven. 202370 refuted. 0 times theorem prover too weak. 15914534 trivial. 0 not checked. [2021-05-02 13:42:12,046 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:42:12,046 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1210741880] [2021-05-02 13:42:12,047 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1210741880] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:42:12,047 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [569269024] [2021-05-02 13:42:12,047 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true