/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/Mono3_1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 12:48:31,033 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 12:48:31,034 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 12:48:31,060 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 12:48:31,082 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 12:48:31,083 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 12:48:31,084 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 12:48:31,085 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 12:48:31,085 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 12:48:31,086 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 12:48:31,088 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 12:48:31,089 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 12:48:31,090 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 12:48:31,096 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 12:48:31,099 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 12:48:31,099 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 12:48:31,101 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 12:48:31,108 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 12:48:31,114 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 12:48:31,115 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 12:48:31,119 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 12:48:31,151 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 12:48:31,151 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 12:48:31,152 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 12:48:31,153 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 12:48:31,153 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 12:48:31,153 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 12:48:31,153 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 12:48:31,153 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 12:48:31,153 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 12:48:31,153 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 12:48:31,154 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 12:48:31,154 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 12:48:31,154 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 12:48:31,154 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 12:48:31,154 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 12:48:31,154 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 12:48:31,154 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 12:48:31,155 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 12:48:31,155 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 12:48:31,155 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 12:48:31,155 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 12:48:31,155 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 12:48:31,155 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 12:48:31,156 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 12:48:31,156 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 12:48:31,156 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 12:48:31,156 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 12:48:31,156 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 12:48:31,156 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 12:48:31,490 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 12:48:31,524 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 12:48:31,526 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 12:48:31,527 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 12:48:31,530 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 12:48:31,531 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/Mono3_1.c [2021-05-02 12:48:31,596 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fc7014b13/7492f9b05720420f9cd1a93ac75754cc/FLAG8d8ec4138 [2021-05-02 12:48:32,175 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 12:48:32,176 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono3_1.c [2021-05-02 12:48:32,181 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fc7014b13/7492f9b05720420f9cd1a93ac75754cc/FLAG8d8ec4138 [2021-05-02 12:48:32,417 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fc7014b13/7492f9b05720420f9cd1a93ac75754cc [2021-05-02 12:48:32,425 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 12:48:32,427 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 12:48:32,430 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 12:48:32,430 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 12:48:32,434 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 12:48:32,434 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:48:32" (1/1) ... [2021-05-02 12:48:32,435 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@277bc2d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:48:32, skipping insertion in model container [2021-05-02 12:48:32,435 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:48:32" (1/1) ... [2021-05-02 12:48:32,441 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 12:48:32,461 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 12:48:32,609 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono3_1.c[311,324] [2021-05-02 12:48:32,622 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:48:32,635 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 12:48:32,647 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono3_1.c[311,324] [2021-05-02 12:48:32,652 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:48:32,664 INFO L208 MainTranslator]: Completed translation [2021-05-02 12:48:32,664 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:48:32 WrapperNode [2021-05-02 12:48:32,664 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 12:48:32,666 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 12:48:32,666 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 12:48:32,668 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 12:48:32,677 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:48:32" (1/1) ... [2021-05-02 12:48:32,677 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:48:32" (1/1) ... [2021-05-02 12:48:32,682 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:48:32" (1/1) ... [2021-05-02 12:48:32,682 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:48:32" (1/1) ... [2021-05-02 12:48:32,686 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:48:32" (1/1) ... [2021-05-02 12:48:32,692 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:48:32" (1/1) ... [2021-05-02 12:48:32,693 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:48:32" (1/1) ... [2021-05-02 12:48:32,696 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 12:48:32,697 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 12:48:32,697 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 12:48:32,697 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 12:48:32,699 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:48:32" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 12:48:32,800 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 12:48:32,800 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 12:48:32,800 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 12:48:32,801 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 12:48:32,801 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 12:48:32,801 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 12:48:32,801 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 12:48:32,801 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 12:48:32,801 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 12:48:32,801 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 12:48:32,801 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 12:48:32,801 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 12:48:32,801 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 12:48:32,802 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 12:48:32,802 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 12:48:32,802 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 12:48:32,802 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 12:48:33,009 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 12:48:33,009 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 12:48:33,010 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:48:33 BoogieIcfgContainer [2021-05-02 12:48:33,011 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 12:48:33,012 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 12:48:33,013 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 12:48:33,016 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 12:48:33,016 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 12:48:32" (1/3) ... [2021-05-02 12:48:33,017 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c4c4130 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:48:33, skipping insertion in model container [2021-05-02 12:48:33,017 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:48:32" (2/3) ... [2021-05-02 12:48:33,017 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c4c4130 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:48:33, skipping insertion in model container [2021-05-02 12:48:33,017 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:48:33" (3/3) ... [2021-05-02 12:48:33,018 INFO L111 eAbstractionObserver]: Analyzing ICFG Mono3_1.c [2021-05-02 12:48:33,024 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 12:48:33,027 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 12:48:33,043 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 12:48:33,062 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 12:48:33,063 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 12:48:33,063 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 12:48:33,063 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 12:48:33,063 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 12:48:33,063 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 12:48:33,063 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 12:48:33,063 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 12:48:33,077 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 12:48:33,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 12:48:33,081 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:48:33,082 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:48:33,082 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:48:33,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:48:33,087 INFO L82 PathProgramCache]: Analyzing trace with hash 1326077006, now seen corresponding path program 1 times [2021-05-02 12:48:33,094 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:48:33,095 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [656982476] [2021-05-02 12:48:33,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:48:33,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:33,390 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:48:33,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:33,407 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:48:33,408 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:48:33,408 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [656982476] [2021-05-02 12:48:33,409 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [656982476] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:48:33,409 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:48:33,409 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 12:48:33,410 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155998075] [2021-05-02 12:48:33,414 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 12:48:33,414 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:48:33,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 12:48:33,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 12:48:33,427 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:33,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:48:33,514 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-05-02 12:48:33,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 12:48:33,517 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 12:48:33,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:48:33,525 INFO L225 Difference]: With dead ends: 31 [2021-05-02 12:48:33,526 INFO L226 Difference]: Without dead ends: 14 [2021-05-02 12:48:33,530 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 71.1ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 12:48:33,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-02 12:48:33,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-02 12:48:33,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:33,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-05-02 12:48:33,571 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2021-05-02 12:48:33,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:48:33,571 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-05-02 12:48:33,571 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:33,572 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-05-02 12:48:33,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 12:48:33,573 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:48:33,574 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:48:33,574 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 12:48:33,574 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:48:33,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:48:33,575 INFO L82 PathProgramCache]: Analyzing trace with hash 1315918275, now seen corresponding path program 1 times [2021-05-02 12:48:33,576 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:48:33,576 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1888338831] [2021-05-02 12:48:33,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:48:33,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:33,700 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:48:33,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:33,730 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:48:33,731 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:48:33,731 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1888338831] [2021-05-02 12:48:33,731 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1888338831] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:48:33,732 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:48:33,732 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 12:48:33,732 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1236276989] [2021-05-02 12:48:33,734 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 12:48:33,735 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:48:33,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 12:48:33,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 12:48:33,742 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:33,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:48:33,821 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2021-05-02 12:48:33,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 12:48:33,822 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 12:48:33,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:48:33,823 INFO L225 Difference]: With dead ends: 25 [2021-05-02 12:48:33,824 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 12:48:33,825 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 68.4ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 12:48:33,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 12:48:33,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-05-02 12:48:33,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:33,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-05-02 12:48:33,839 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2021-05-02 12:48:33,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:48:33,839 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-05-02 12:48:33,839 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:33,840 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-05-02 12:48:33,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 12:48:33,841 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:48:33,841 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:48:33,842 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 12:48:33,842 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:48:33,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:48:33,843 INFO L82 PathProgramCache]: Analyzing trace with hash 644646283, now seen corresponding path program 1 times [2021-05-02 12:48:33,843 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:48:33,843 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2012854379] [2021-05-02 12:48:33,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:48:33,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:33,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:48:34,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:34,018 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:48:34,018 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:48:34,019 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2012854379] [2021-05-02 12:48:34,019 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2012854379] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:34,021 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1220632754] [2021-05-02 12:48:34,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:48:34,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:34,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 12:48:34,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:48:34,191 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:48:34,192 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1220632754] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:34,192 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:48:34,192 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-05-02 12:48:34,193 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047956877] [2021-05-02 12:48:34,194 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 12:48:34,194 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:48:34,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 12:48:34,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:48:34,196 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:34,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:48:34,403 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2021-05-02 12:48:34,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 12:48:34,404 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 12:48:34,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:48:34,405 INFO L225 Difference]: With dead ends: 28 [2021-05-02 12:48:34,405 INFO L226 Difference]: Without dead ends: 20 [2021-05-02 12:48:34,406 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 213.4ms TimeCoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:48:34,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-02 12:48:34,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2021-05-02 12:48:34,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:34,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-02 12:48:34,416 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2021-05-02 12:48:34,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:48:34,416 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-02 12:48:34,417 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:34,417 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-02 12:48:34,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 12:48:34,418 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:48:34,418 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:48:34,629 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 12:48:34,630 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:48:34,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:48:34,631 INFO L82 PathProgramCache]: Analyzing trace with hash 148462787, now seen corresponding path program 2 times [2021-05-02 12:48:34,631 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:48:34,631 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1249142294] [2021-05-02 12:48:34,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:48:34,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:34,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:48:34,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:34,809 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:48:34,810 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:48:34,810 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1249142294] [2021-05-02 12:48:34,810 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1249142294] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:34,810 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1254240148] [2021-05-02 12:48:34,811 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:48:34,867 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:48:34,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:48:34,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 12:48:34,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:48:35,038 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:48:35,039 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1254240148] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:35,039 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:48:35,039 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 11 [2021-05-02 12:48:35,040 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1356443153] [2021-05-02 12:48:35,040 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 12:48:35,040 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:48:35,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 12:48:35,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:48:35,041 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:35,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:48:35,291 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-05-02 12:48:35,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 12:48:35,291 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 12:48:35,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:48:35,292 INFO L225 Difference]: With dead ends: 31 [2021-05-02 12:48:35,292 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 12:48:35,293 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 291.6ms TimeCoverageRelationStatistics Valid=68, Invalid=204, Unknown=0, NotChecked=0, Total=272 [2021-05-02 12:48:35,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 12:48:35,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-05-02 12:48:35,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:35,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-05-02 12:48:35,301 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 17 [2021-05-02 12:48:35,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:48:35,302 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-05-02 12:48:35,303 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:35,303 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-05-02 12:48:35,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 12:48:35,304 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:48:35,304 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:48:35,533 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:48:35,533 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:48:35,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:48:35,534 INFO L82 PathProgramCache]: Analyzing trace with hash 1623366283, now seen corresponding path program 3 times [2021-05-02 12:48:35,534 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:48:35,534 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [614618642] [2021-05-02 12:48:35,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:48:35,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:35,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:48:35,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:35,680 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:48:35,680 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:48:35,681 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [614618642] [2021-05-02 12:48:35,681 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [614618642] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:35,681 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [496519001] [2021-05-02 12:48:35,681 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:48:35,725 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 12:48:35,726 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:48:35,727 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 12:48:35,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:48:35,801 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:35,821 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 12:48:35,821 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [496519001] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:48:35,822 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 12:48:35,822 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [7] total 9 [2021-05-02 12:48:35,822 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092724681] [2021-05-02 12:48:35,822 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 12:48:35,823 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:48:35,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 12:48:35,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-05-02 12:48:35,824 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:35,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:48:35,866 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2021-05-02 12:48:35,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 12:48:35,867 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-02 12:48:35,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:48:35,868 INFO L225 Difference]: With dead ends: 32 [2021-05-02 12:48:35,868 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 12:48:35,869 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 107.9ms TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:48:35,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 12:48:35,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2021-05-02 12:48:35,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:35,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-05-02 12:48:35,874 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 20 [2021-05-02 12:48:35,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:48:35,875 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-05-02 12:48:35,875 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:35,875 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-05-02 12:48:35,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 12:48:35,876 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:48:35,876 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:48:36,089 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:48:36,089 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:48:36,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:48:36,090 INFO L82 PathProgramCache]: Analyzing trace with hash 438017605, now seen corresponding path program 1 times [2021-05-02 12:48:36,090 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:48:36,090 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [8921032] [2021-05-02 12:48:36,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:48:36,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:36,214 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:48:36,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:36,227 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:48:36,228 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:48:36,228 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [8921032] [2021-05-02 12:48:36,228 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [8921032] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:36,228 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1369532340] [2021-05-02 12:48:36,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:48:36,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:36,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 12:48:36,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:48:36,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:36,345 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:48:36,346 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1369532340] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:36,346 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:48:36,346 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 12:48:36,346 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145266867] [2021-05-02 12:48:36,347 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 12:48:36,347 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:48:36,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 12:48:36,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:48:36,348 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:36,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:48:36,552 INFO L93 Difference]: Finished difference Result 38 states and 41 transitions. [2021-05-02 12:48:36,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 12:48:36,552 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-02 12:48:36,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:48:36,553 INFO L225 Difference]: With dead ends: 38 [2021-05-02 12:48:36,553 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 12:48:36,554 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 187.4ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:48:36,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 12:48:36,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2021-05-02 12:48:36,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:36,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2021-05-02 12:48:36,559 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 23 [2021-05-02 12:48:36,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:48:36,559 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2021-05-02 12:48:36,559 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:36,560 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2021-05-02 12:48:36,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 12:48:36,560 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:48:36,560 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:48:36,777 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:48:36,777 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:48:36,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:48:36,777 INFO L82 PathProgramCache]: Analyzing trace with hash 1329686029, now seen corresponding path program 2 times [2021-05-02 12:48:36,777 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:48:36,778 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2144521777] [2021-05-02 12:48:36,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:48:36,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:36,915 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:48:36,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:36,932 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 9 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:48:36,935 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:48:36,935 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2144521777] [2021-05-02 12:48:36,936 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2144521777] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:36,936 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2137806079] [2021-05-02 12:48:36,936 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:48:36,994 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:48:36,994 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:48:36,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 12:48:36,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:48:37,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:37,106 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:48:37,106 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2137806079] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:37,106 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:48:37,106 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2021-05-02 12:48:37,106 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560370701] [2021-05-02 12:48:37,107 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 12:48:37,107 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:48:37,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 12:48:37,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:48:37,108 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:37,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:48:37,478 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2021-05-02 12:48:37,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 12:48:37,479 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-02 12:48:37,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:48:37,481 INFO L225 Difference]: With dead ends: 44 [2021-05-02 12:48:37,481 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 12:48:37,482 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 301.5ms TimeCoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:48:37,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 12:48:37,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2021-05-02 12:48:37,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 28 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:37,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2021-05-02 12:48:37,503 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 26 [2021-05-02 12:48:37,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:48:37,504 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2021-05-02 12:48:37,504 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:37,504 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2021-05-02 12:48:37,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 12:48:37,504 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:48:37,505 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:48:37,705 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 12:48:37,706 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:48:37,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:48:37,706 INFO L82 PathProgramCache]: Analyzing trace with hash 2015361805, now seen corresponding path program 3 times [2021-05-02 12:48:37,706 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:48:37,707 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [995587680] [2021-05-02 12:48:37,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:48:37,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:37,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:48:37,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:37,853 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 13 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:48:37,853 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:48:37,853 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [995587680] [2021-05-02 12:48:37,853 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [995587680] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:37,853 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1918099] [2021-05-02 12:48:37,854 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:48:37,912 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 12:48:37,912 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:48:37,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 12:48:37,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:48:38,047 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:38,056 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 2 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 12:48:38,057 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1918099] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:38,057 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:48:38,057 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5] total 13 [2021-05-02 12:48:38,058 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460335659] [2021-05-02 12:48:38,058 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 12:48:38,058 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:48:38,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 12:48:38,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=111, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:48:38,059 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand has 13 states, 13 states have (on average 3.0) internal successors, (39), 12 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:38,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:48:38,708 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2021-05-02 12:48:38,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 12:48:38,708 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.0) internal successors, (39), 12 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 12:48:38,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:48:38,710 INFO L225 Difference]: With dead ends: 58 [2021-05-02 12:48:38,710 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 12:48:38,711 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 608.4ms TimeCoverageRelationStatistics Valid=172, Invalid=478, Unknown=0, NotChecked=0, Total=650 [2021-05-02 12:48:38,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 12:48:38,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 42. [2021-05-02 12:48:38,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 37 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:38,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2021-05-02 12:48:38,718 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 32 [2021-05-02 12:48:38,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:48:38,719 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2021-05-02 12:48:38,719 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.0) internal successors, (39), 12 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:38,719 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2021-05-02 12:48:38,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 12:48:38,720 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:48:38,720 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:48:38,945 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:48:38,945 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:48:38,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:48:38,948 INFO L82 PathProgramCache]: Analyzing trace with hash -986291837, now seen corresponding path program 4 times [2021-05-02 12:48:38,948 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:48:38,948 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [790248646] [2021-05-02 12:48:38,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:48:38,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:39,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:48:39,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:39,145 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 43 proven. 100 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 12:48:39,145 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:48:39,145 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [790248646] [2021-05-02 12:48:39,145 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [790248646] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:39,145 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [93527499] [2021-05-02 12:48:39,145 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:48:39,218 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:48:39,218 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:48:39,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 12:48:39,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:48:39,355 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:39,366 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 19 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:48:39,366 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [93527499] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:39,366 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:48:39,366 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 14 [2021-05-02 12:48:39,367 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137563112] [2021-05-02 12:48:39,367 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 12:48:39,367 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:48:39,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 12:48:39,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:48:39,368 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:39,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:48:39,886 INFO L93 Difference]: Finished difference Result 62 states and 68 transitions. [2021-05-02 12:48:39,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 12:48:39,886 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-02 12:48:39,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:48:39,887 INFO L225 Difference]: With dead ends: 62 [2021-05-02 12:48:39,887 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 12:48:39,888 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 448.8ms TimeCoverageRelationStatistics Valid=83, Invalid=469, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:48:39,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 12:48:39,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2021-05-02 12:48:39,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 43 states have (on average 1.069767441860465) internal successors, (46), 43 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:39,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2021-05-02 12:48:39,895 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 41 [2021-05-02 12:48:39,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:48:39,895 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2021-05-02 12:48:39,895 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:39,895 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2021-05-02 12:48:39,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 12:48:39,896 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:48:39,896 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:48:40,109 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:48:40,109 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:48:40,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:48:40,110 INFO L82 PathProgramCache]: Analyzing trace with hash -356832125, now seen corresponding path program 5 times [2021-05-02 12:48:40,110 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:48:40,110 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1798383290] [2021-05-02 12:48:40,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:48:40,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:40,313 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:48:40,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:40,322 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 53 proven. 155 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 12:48:40,323 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:48:40,323 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1798383290] [2021-05-02 12:48:40,323 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1798383290] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:40,323 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [479556126] [2021-05-02 12:48:40,323 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:48:40,471 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2021-05-02 12:48:40,472 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:48:40,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 12:48:40,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:48:40,636 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:40,649 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 53 proven. 155 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 12:48:40,649 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [479556126] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:40,649 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:48:40,650 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-02 12:48:40,650 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1357380253] [2021-05-02 12:48:40,650 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 12:48:40,650 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:48:40,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 12:48:40,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-02 12:48:40,651 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand has 15 states, 15 states have (on average 3.066666666666667) internal successors, (46), 14 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:41,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:48:41,254 INFO L93 Difference]: Finished difference Result 65 states and 70 transitions. [2021-05-02 12:48:41,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 12:48:41,255 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.066666666666667) internal successors, (46), 14 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-05-02 12:48:41,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:48:41,256 INFO L225 Difference]: With dead ends: 65 [2021-05-02 12:48:41,256 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 12:48:41,257 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 43 SyntacticMatches, 7 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 528.1ms TimeCoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2021-05-02 12:48:41,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 12:48:41,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2021-05-02 12:48:41,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.065217391304348) internal successors, (49), 46 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:41,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2021-05-02 12:48:41,264 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 47 [2021-05-02 12:48:41,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:48:41,264 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2021-05-02 12:48:41,264 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 3.066666666666667) internal successors, (46), 14 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:41,264 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2021-05-02 12:48:41,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 12:48:41,265 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:48:41,265 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:48:41,470 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 12:48:41,471 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:48:41,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:48:41,471 INFO L82 PathProgramCache]: Analyzing trace with hash 309861451, now seen corresponding path program 6 times [2021-05-02 12:48:41,471 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:48:41,471 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [373614936] [2021-05-02 12:48:41,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:48:41,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:41,693 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:48:41,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:41,699 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 58 proven. 187 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 12:48:41,699 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:48:41,699 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [373614936] [2021-05-02 12:48:41,699 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [373614936] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:41,699 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2053920474] [2021-05-02 12:48:41,704 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 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:48:41,855 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-05-02 12:48:41,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:48:41,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 12:48:41,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:48:42,021 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:42,029 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 85 proven. 7 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 12:48:42,029 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2053920474] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:42,029 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:48:42,029 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 6] total 19 [2021-05-02 12:48:42,029 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [285130527] [2021-05-02 12:48:42,030 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 12:48:42,030 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:48:42,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 12:48:42,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=257, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:48:42,031 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand has 19 states, 19 states have (on average 3.1052631578947367) internal successors, (59), 18 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:43,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:48:43,219 INFO L93 Difference]: Finished difference Result 82 states and 93 transitions. [2021-05-02 12:48:43,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 12:48:43,219 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.1052631578947367) internal successors, (59), 18 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-02 12:48:43,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:48:43,222 INFO L225 Difference]: With dead ends: 82 [2021-05-02 12:48:43,222 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 12:48:43,223 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 213 ImplicationChecksByTransitivity, 1106.9ms TimeCoverageRelationStatistics Valid=350, Invalid=1210, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 12:48:43,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 12:48:43,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 60. [2021-05-02 12:48:43,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 55 states have (on average 1.0727272727272728) internal successors, (59), 55 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:43,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 63 transitions. [2021-05-02 12:48:43,231 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 63 transitions. Word has length 50 [2021-05-02 12:48:43,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:48:43,231 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 63 transitions. [2021-05-02 12:48:43,231 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 3.1052631578947367) internal successors, (59), 18 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:43,231 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 63 transitions. [2021-05-02 12:48:43,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 12:48:43,232 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:48:43,232 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:48:43,437 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:48:43,437 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:48:43,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:48:43,438 INFO L82 PathProgramCache]: Analyzing trace with hash 820907909, now seen corresponding path program 7 times [2021-05-02 12:48:43,438 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:48:43,438 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1007049517] [2021-05-02 12:48:43,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:48:43,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:43,725 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:48:43,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:43,733 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 109 proven. 260 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 12:48:43,733 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:48:43,733 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1007049517] [2021-05-02 12:48:43,734 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1007049517] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:43,734 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [712800960] [2021-05-02 12:48:43,734 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 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:48:43,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:43,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 12:48:43,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:48:43,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:43,979 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 109 proven. 260 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 12:48:43,979 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [712800960] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:43,979 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:48:43,979 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 12:48:43,979 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331809637] [2021-05-02 12:48:43,980 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 12:48:43,980 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:48:43,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 12:48:43,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:48:43,981 INFO L87 Difference]: Start difference. First operand 60 states and 63 transitions. Second operand has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 17 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:44,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:48:44,699 INFO L93 Difference]: Finished difference Result 80 states and 87 transitions. [2021-05-02 12:48:44,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 12:48:44,699 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 17 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-02 12:48:44,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:48:44,700 INFO L225 Difference]: With dead ends: 80 [2021-05-02 12:48:44,700 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 12:48:44,701 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 602.9ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-02 12:48:44,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 12:48:44,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2021-05-02 12:48:44,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.0689655172413792) internal successors, (62), 58 states have internal predecessors, (62), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:44,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2021-05-02 12:48:44,708 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 59 [2021-05-02 12:48:44,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:48:44,708 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2021-05-02 12:48:44,708 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 17 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:44,708 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2021-05-02 12:48:44,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 12:48:44,709 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:48:44,709 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 14, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:48:44,916 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:48:44,917 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:48:44,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:48:44,918 INFO L82 PathProgramCache]: Analyzing trace with hash 1209635661, now seen corresponding path program 8 times [2021-05-02 12:48:44,918 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:48:44,918 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [550188128] [2021-05-02 12:48:44,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:48:44,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:45,240 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:48:45,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:45,258 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 117 proven. 301 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 12:48:45,258 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:48:45,258 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [550188128] [2021-05-02 12:48:45,258 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [550188128] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:45,258 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [929127002] [2021-05-02 12:48:45,259 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 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:48:45,311 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:48:45,312 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:48:45,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-02 12:48:45,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:48:45,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:45,535 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 0 proven. 425 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:48:45,535 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [929127002] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:45,535 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:48:45,535 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 20] total 22 [2021-05-02 12:48:45,535 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229581034] [2021-05-02 12:48:45,536 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 12:48:45,536 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:48:45,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 12:48:45,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=406, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:48:45,537 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand has 22 states, 22 states have (on average 3.0) internal successors, (66), 21 states have internal predecessors, (66), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:46,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:48:46,688 INFO L93 Difference]: Finished difference Result 92 states and 102 transitions. [2021-05-02 12:48:46,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 12:48:46,689 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.0) internal successors, (66), 21 states have internal predecessors, (66), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2021-05-02 12:48:46,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:48:46,689 INFO L225 Difference]: With dead ends: 92 [2021-05-02 12:48:46,690 INFO L226 Difference]: Without dead ends: 76 [2021-05-02 12:48:46,691 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 813.9ms TimeCoverageRelationStatistics Valid=143, Invalid=1417, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 12:48:46,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-02 12:48:46,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2021-05-02 12:48:46,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.0571428571428572) internal successors, (74), 70 states have internal predecessors, (74), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:46,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2021-05-02 12:48:46,701 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 62 [2021-05-02 12:48:46,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:48:46,701 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2021-05-02 12:48:46,701 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 3.0) internal successors, (66), 21 states have internal predecessors, (66), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:46,701 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2021-05-02 12:48:46,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-02 12:48:46,702 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:48:46,702 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 18, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:48:46,917 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 12:48:46,917 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:48:46,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:48:46,918 INFO L82 PathProgramCache]: Analyzing trace with hash -790233779, now seen corresponding path program 9 times [2021-05-02 12:48:46,918 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:48:46,918 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [624319203] [2021-05-02 12:48:46,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:48:46,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:47,273 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:48:47,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:47,282 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 149 proven. 495 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 12:48:47,283 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:48:47,283 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [624319203] [2021-05-02 12:48:47,283 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [624319203] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:47,283 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1841551485] [2021-05-02 12:48:47,283 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:48:47,390 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-05-02 12:48:47,391 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:48:47,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 12:48:47,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:48:47,637 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:47,648 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 194 proven. 15 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2021-05-02 12:48:47,648 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1841551485] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:47,648 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:48:47,648 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 7] total 27 [2021-05-02 12:48:47,649 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1569313450] [2021-05-02 12:48:47,649 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 12:48:47,649 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:48:47,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 12:48:47,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=552, Unknown=0, NotChecked=0, Total=702 [2021-05-02 12:48:47,651 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand has 27 states, 27 states have (on average 3.074074074074074) internal successors, (83), 26 states have internal predecessors, (83), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:50,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:48:50,221 INFO L93 Difference]: Finished difference Result 112 states and 126 transitions. [2021-05-02 12:48:50,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 12:48:50,222 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.074074074074074) internal successors, (83), 26 states have internal predecessors, (83), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 74 [2021-05-02 12:48:50,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:48:50,223 INFO L225 Difference]: With dead ends: 112 [2021-05-02 12:48:50,223 INFO L226 Difference]: Without dead ends: 96 [2021-05-02 12:48:50,225 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 465 ImplicationChecksByTransitivity, 2283.6ms TimeCoverageRelationStatistics Valid=641, Invalid=2665, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 12:48:50,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-02 12:48:50,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 84. [2021-05-02 12:48:50,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 79 states have (on average 1.0632911392405062) internal successors, (84), 79 states have internal predecessors, (84), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:50,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 88 transitions. [2021-05-02 12:48:50,235 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 88 transitions. Word has length 74 [2021-05-02 12:48:50,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:48:50,235 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 88 transitions. [2021-05-02 12:48:50,235 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 3.074074074074074) internal successors, (83), 26 states have internal predecessors, (83), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:50,236 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 88 transitions. [2021-05-02 12:48:50,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 12:48:50,237 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:48:50,237 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 20, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:48:50,447 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 12:48:50,448 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:48:50,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:48:50,449 INFO L82 PathProgramCache]: Analyzing trace with hash -2009565373, now seen corresponding path program 10 times [2021-05-02 12:48:50,449 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:48:50,449 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [997304438] [2021-05-02 12:48:50,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:48:50,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:50,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:48:50,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:50,912 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 227 proven. 610 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:48:50,913 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:48:50,913 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [997304438] [2021-05-02 12:48:50,913 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [997304438] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:50,913 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1391412445] [2021-05-02 12:48:50,913 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 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:48:50,994 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:48:50,994 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:48:50,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 44 conjunts are in the unsatisfiable core [2021-05-02 12:48:50,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:48:51,207 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:51,237 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 227 proven. 610 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:48:51,238 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1391412445] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:51,238 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:48:51,238 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 12:48:51,239 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757787875] [2021-05-02 12:48:51,240 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 12:48:51,240 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:48:51,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 12:48:51,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-02 12:48:51,242 INFO L87 Difference]: Start difference. First operand 84 states and 88 transitions. Second operand has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:52,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:48:52,588 INFO L93 Difference]: Finished difference Result 107 states and 116 transitions. [2021-05-02 12:48:52,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 12:48:52,589 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2021-05-02 12:48:52,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:48:52,590 INFO L225 Difference]: With dead ends: 107 [2021-05-02 12:48:52,590 INFO L226 Difference]: Without dead ends: 88 [2021-05-02 12:48:52,591 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 84 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 1024.3ms TimeCoverageRelationStatistics Valid=173, Invalid=1897, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 12:48:52,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-05-02 12:48:52,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2021-05-02 12:48:52,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.0609756097560976) internal successors, (87), 82 states have internal predecessors, (87), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:52,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 91 transitions. [2021-05-02 12:48:52,601 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 91 transitions. Word has length 83 [2021-05-02 12:48:52,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:48:52,601 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 91 transitions. [2021-05-02 12:48:52,602 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:52,602 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 91 transitions. [2021-05-02 12:48:52,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-02 12:48:52,603 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:48:52,603 INFO L523 BasicCegarLoop]: trace histogram [25, 25, 21, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:48:52,816 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 12:48:52,817 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:48:52,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:48:52,817 INFO L82 PathProgramCache]: Analyzing trace with hash -1954077941, now seen corresponding path program 11 times [2021-05-02 12:48:52,818 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:48:52,818 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2110862510] [2021-05-02 12:48:52,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:48:52,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:53,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:48:53,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:53,233 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 238 proven. 672 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:48:53,233 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:48:53,233 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2110862510] [2021-05-02 12:48:53,233 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2110862510] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:53,233 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1844844665] [2021-05-02 12:48:53,233 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:48:55,685 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 26 check-sat command(s) [2021-05-02 12:48:55,685 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:48:55,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 54 conjunts are in the unsatisfiable core [2021-05-02 12:48:55,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:48:56,024 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:56,041 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 181 proven. 737 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 12:48:56,041 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1844844665] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:56,041 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:48:56,041 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 27 [2021-05-02 12:48:56,041 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [871456960] [2021-05-02 12:48:56,042 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 12:48:56,042 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:48:56,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 12:48:56,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=629, Unknown=0, NotChecked=0, Total=702 [2021-05-02 12:48:56,043 INFO L87 Difference]: Start difference. First operand 87 states and 91 transitions. Second operand has 27 states, 27 states have (on average 3.037037037037037) internal successors, (82), 26 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:57,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:48:57,466 INFO L93 Difference]: Finished difference Result 113 states and 123 transitions. [2021-05-02 12:48:57,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 12:48:57,466 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.037037037037037) internal successors, (82), 26 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 86 [2021-05-02 12:48:57,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:48:57,467 INFO L225 Difference]: With dead ends: 113 [2021-05-02 12:48:57,467 INFO L226 Difference]: Without dead ends: 94 [2021-05-02 12:48:57,468 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 80 SyntacticMatches, 8 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 274 ImplicationChecksByTransitivity, 1185.7ms TimeCoverageRelationStatistics Valid=187, Invalid=2263, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 12:48:57,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-02 12:48:57,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2021-05-02 12:48:57,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 88 states have (on average 1.0568181818181819) internal successors, (93), 88 states have internal predecessors, (93), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:57,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 97 transitions. [2021-05-02 12:48:57,475 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 97 transitions. Word has length 86 [2021-05-02 12:48:57,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:48:57,476 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 97 transitions. [2021-05-02 12:48:57,476 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 3.037037037037037) internal successors, (82), 26 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:48:57,476 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 97 transitions. [2021-05-02 12:48:57,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-05-02 12:48:57,477 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:48:57,477 INFO L523 BasicCegarLoop]: trace histogram [27, 27, 23, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:48:57,677 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:48:57,678 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:48:57,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:48:57,678 INFO L82 PathProgramCache]: Analyzing trace with hash 1506818059, now seen corresponding path program 12 times [2021-05-02 12:48:57,678 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:48:57,678 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1839361242] [2021-05-02 12:48:57,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:48:57,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:58,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:48:58,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:58,115 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 260 proven. 805 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:48:58,115 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:48:58,115 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1839361242] [2021-05-02 12:48:58,116 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1839361242] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:58,116 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1585681242] [2021-05-02 12:48:58,116 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:48:58,388 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2021-05-02 12:48:58,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:48:58,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 12:48:58,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:48:59,199 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:59,217 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 317 proven. 26 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2021-05-02 12:48:59,217 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1585681242] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:59,217 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:48:59,217 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 9] total 34 [2021-05-02 12:48:59,217 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500609931] [2021-05-02 12:48:59,219 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 12:48:59,219 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:48:59,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 12:48:59,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=987, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 12:48:59,220 INFO L87 Difference]: Start difference. First operand 93 states and 97 transitions. Second operand has 34 states, 34 states have (on average 2.9705882352941178) internal successors, (101), 33 states have internal predecessors, (101), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:01,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:01,646 INFO L93 Difference]: Finished difference Result 124 states and 137 transitions. [2021-05-02 12:49:01,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 12:49:01,646 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.9705882352941178) internal successors, (101), 33 states have internal predecessors, (101), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 92 [2021-05-02 12:49:01,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:01,647 INFO L225 Difference]: With dead ends: 124 [2021-05-02 12:49:01,647 INFO L226 Difference]: Without dead ends: 105 [2021-05-02 12:49:01,648 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 86 SyntacticMatches, 7 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 549 ImplicationChecksByTransitivity, 2260.1ms TimeCoverageRelationStatistics Valid=430, Invalid=3860, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 12:49:01,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-05-02 12:49:01,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 103. [2021-05-02 12:49:01,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.030612244897959) internal successors, (101), 98 states have internal predecessors, (101), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:01,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 105 transitions. [2021-05-02 12:49:01,657 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 105 transitions. Word has length 92 [2021-05-02 12:49:01,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:01,657 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 105 transitions. [2021-05-02 12:49:01,657 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.9705882352941178) internal successors, (101), 33 states have internal predecessors, (101), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:01,658 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 105 transitions. [2021-05-02 12:49:01,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 12:49:01,658 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:01,659 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 25, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:01,864 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 12:49:01,864 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:01,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:01,865 INFO L82 PathProgramCache]: Analyzing trace with hash -341468219, now seen corresponding path program 13 times [2021-05-02 12:49:01,865 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:01,865 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1259797945] [2021-05-02 12:49:01,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:01,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:02,362 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:02,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:02,373 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 359 proven. 950 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 12:49:02,374 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:02,374 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1259797945] [2021-05-02 12:49:02,374 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1259797945] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:02,374 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1568929744] [2021-05-02 12:49:02,374 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:02,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:02,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 54 conjunts are in the unsatisfiable core [2021-05-02 12:49:02,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:02,674 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:02,695 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 359 proven. 950 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 12:49:02,695 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1568929744] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:02,695 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:02,695 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 12:49:02,696 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778285760] [2021-05-02 12:49:02,696 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 12:49:02,696 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:02,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 12:49:02,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-02 12:49:02,697 INFO L87 Difference]: Start difference. First operand 103 states and 105 transitions. Second operand has 30 states, 30 states have (on average 3.033333333333333) internal successors, (91), 29 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:04,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:04,461 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2021-05-02 12:49:04,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 12:49:04,462 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 3.033333333333333) internal successors, (91), 29 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2021-05-02 12:49:04,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:04,463 INFO L225 Difference]: With dead ends: 130 [2021-05-02 12:49:04,463 INFO L226 Difference]: Without dead ends: 107 [2021-05-02 12:49:04,464 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 102 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 330 ImplicationChecksByTransitivity, 1291.3ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 12:49:04,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-05-02 12:49:04,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 106. [2021-05-02 12:49:04,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 101 states have (on average 1.0297029702970297) internal successors, (104), 101 states have internal predecessors, (104), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:04,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 108 transitions. [2021-05-02 12:49:04,471 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 108 transitions. Word has length 101 [2021-05-02 12:49:04,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:04,472 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 108 transitions. [2021-05-02 12:49:04,472 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 3.033333333333333) internal successors, (91), 29 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:04,472 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 108 transitions. [2021-05-02 12:49:04,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-05-02 12:49:04,473 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:04,473 INFO L523 BasicCegarLoop]: trace histogram [31, 31, 26, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:04,677 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 12:49:04,677 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:04,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:04,677 INFO L82 PathProgramCache]: Analyzing trace with hash 1943790989, now seen corresponding path program 14 times [2021-05-02 12:49:04,677 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:04,678 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2047817181] [2021-05-02 12:49:04,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:04,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:05,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:05,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:05,270 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 373 proven. 1027 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 12:49:05,270 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:05,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2047817181] [2021-05-02 12:49:05,270 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2047817181] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:05,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470217032] [2021-05-02 12:49:05,271 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:05,352 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:49:05,353 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:49:05,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-02 12:49:05,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:05,714 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:05,722 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 0 proven. 1426 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:49:05,722 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [470217032] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:05,722 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:05,723 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 34] total 36 [2021-05-02 12:49:05,723 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672651545] [2021-05-02 12:49:05,724 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 12:49:05,724 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:05,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 12:49:05,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1164, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 12:49:05,725 INFO L87 Difference]: Start difference. First operand 106 states and 108 transitions. Second operand has 36 states, 36 states have (on average 3.0) internal successors, (108), 35 states have internal predecessors, (108), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:08,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:08,156 INFO L93 Difference]: Finished difference Result 148 states and 158 transitions. [2021-05-02 12:49:08,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 12:49:08,165 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.0) internal successors, (108), 35 states have internal predecessors, (108), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 104 [2021-05-02 12:49:08,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:08,165 INFO L225 Difference]: With dead ends: 148 [2021-05-02 12:49:08,166 INFO L226 Difference]: Without dead ends: 125 [2021-05-02 12:49:08,170 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 101 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 515 ImplicationChecksByTransitivity, 1766.1ms TimeCoverageRelationStatistics Valid=251, Invalid=4305, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 12:49:08,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-02 12:49:08,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 124. [2021-05-02 12:49:08,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 119 states have (on average 1.0252100840336134) internal successors, (122), 119 states have internal predecessors, (122), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:08,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 126 transitions. [2021-05-02 12:49:08,180 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 126 transitions. Word has length 104 [2021-05-02 12:49:08,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:08,180 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 126 transitions. [2021-05-02 12:49:08,180 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 3.0) internal successors, (108), 35 states have internal predecessors, (108), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:08,180 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 126 transitions. [2021-05-02 12:49:08,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-05-02 12:49:08,181 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:08,181 INFO L523 BasicCegarLoop]: trace histogram [37, 37, 32, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:08,396 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:08,397 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:08,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:08,397 INFO L82 PathProgramCache]: Analyzing trace with hash -696638323, now seen corresponding path program 15 times [2021-05-02 12:49:08,398 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:08,398 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1135610867] [2021-05-02 12:49:08,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:08,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:09,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:09,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:09,167 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 457 proven. 1552 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 12:49:09,167 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:09,167 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1135610867] [2021-05-02 12:49:09,167 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1135610867] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:09,167 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [485338222] [2021-05-02 12:49:09,168 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:09,353 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-02 12:49:09,354 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:49:09,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 12:49:09,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:09,807 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:09,819 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 538 proven. 40 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2021-05-02 12:49:09,819 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [485338222] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:09,819 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:09,819 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 9] total 43 [2021-05-02 12:49:09,820 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883844326] [2021-05-02 12:49:09,820 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 12:49:09,820 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:09,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 12:49:09,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=1487, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 12:49:09,821 INFO L87 Difference]: Start difference. First operand 124 states and 126 transitions. Second operand has 43 states, 43 states have (on average 3.046511627906977) internal successors, (131), 42 states have internal predecessors, (131), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:15,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:15,007 INFO L93 Difference]: Finished difference Result 173 states and 186 transitions. [2021-05-02 12:49:15,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-02 12:49:15,007 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 3.046511627906977) internal successors, (131), 42 states have internal predecessors, (131), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 122 [2021-05-02 12:49:15,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:15,008 INFO L225 Difference]: With dead ends: 173 [2021-05-02 12:49:15,008 INFO L226 Difference]: Without dead ends: 150 [2021-05-02 12:49:15,011 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1263 ImplicationChecksByTransitivity, 4801.7ms TimeCoverageRelationStatistics Valid=1436, Invalid=7306, Unknown=0, NotChecked=0, Total=8742 [2021-05-02 12:49:15,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-05-02 12:49:15,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 132. [2021-05-02 12:49:15,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 127 states have (on average 1.0236220472440944) internal successors, (130), 127 states have internal predecessors, (130), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:15,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 134 transitions. [2021-05-02 12:49:15,020 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 134 transitions. Word has length 122 [2021-05-02 12:49:15,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:15,020 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 134 transitions. [2021-05-02 12:49:15,020 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 3.046511627906977) internal successors, (131), 42 states have internal predecessors, (131), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:15,020 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 134 transitions. [2021-05-02 12:49:15,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-02 12:49:15,021 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:15,021 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 34, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:15,226 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:15,227 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:15,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:15,227 INFO L82 PathProgramCache]: Analyzing trace with hash -1978005501, now seen corresponding path program 16 times [2021-05-02 12:49:15,227 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:15,227 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [902574149] [2021-05-02 12:49:15,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:15,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:16,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:16,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:16,137 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 589 proven. 1751 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 12:49:16,138 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:16,138 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [902574149] [2021-05-02 12:49:16,138 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [902574149] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:16,138 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2069661166] [2021-05-02 12:49:16,138 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:16,208 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:49:16,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:49:16,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 72 conjunts are in the unsatisfiable core [2021-05-02 12:49:16,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:16,488 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:16,513 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 589 proven. 1751 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 12:49:16,513 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2069661166] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:16,514 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:16,514 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37] total 39 [2021-05-02 12:49:16,514 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142511837] [2021-05-02 12:49:16,514 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 12:49:16,514 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:16,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 12:49:16,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 12:49:16,515 INFO L87 Difference]: Start difference. First operand 132 states and 134 transitions. Second operand has 39 states, 39 states have (on average 3.0256410256410255) internal successors, (118), 38 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:19,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:19,506 INFO L93 Difference]: Finished difference Result 161 states and 166 transitions. [2021-05-02 12:49:19,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 12:49:19,506 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 3.0256410256410255) internal successors, (118), 38 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 131 [2021-05-02 12:49:19,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:19,507 INFO L225 Difference]: With dead ends: 161 [2021-05-02 12:49:19,507 INFO L226 Difference]: Without dead ends: 136 [2021-05-02 12:49:19,509 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 132 SyntacticMatches, 2 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 600 ImplicationChecksByTransitivity, 2181.2ms TimeCoverageRelationStatistics Valid=285, Invalid=5117, Unknown=0, NotChecked=0, Total=5402 [2021-05-02 12:49:19,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-05-02 12:49:19,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 135. [2021-05-02 12:49:19,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 130 states have (on average 1.023076923076923) internal successors, (133), 130 states have internal predecessors, (133), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:19,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 137 transitions. [2021-05-02 12:49:19,519 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 137 transitions. Word has length 131 [2021-05-02 12:49:19,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:19,519 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 137 transitions. [2021-05-02 12:49:19,519 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 3.0256410256410255) internal successors, (118), 38 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:19,519 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 137 transitions. [2021-05-02 12:49:19,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-05-02 12:49:19,520 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:19,520 INFO L523 BasicCegarLoop]: trace histogram [41, 41, 35, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:19,743 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:19,743 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:19,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:19,744 INFO L82 PathProgramCache]: Analyzing trace with hash 113705931, now seen corresponding path program 17 times [2021-05-02 12:49:19,744 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:19,744 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [706888126] [2021-05-02 12:49:19,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:19,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:20,628 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:20,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:20,646 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 606 proven. 1855 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 12:49:20,647 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:20,647 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [706888126] [2021-05-02 12:49:20,647 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [706888126] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:20,647 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [366809995] [2021-05-02 12:49:20,647 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:37,160 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 42 check-sat command(s) [2021-05-02 12:49:37,161 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:49:37,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 80 conjunts are in the unsatisfiable core [2021-05-02 12:49:37,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:37,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:37,621 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 309 proven. 2185 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 12:49:37,622 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [366809995] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:37,622 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:37,622 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 41] total 43 [2021-05-02 12:49:37,622 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43228203] [2021-05-02 12:49:37,624 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 12:49:37,624 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:37,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 12:49:37,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1687, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 12:49:37,626 INFO L87 Difference]: Start difference. First operand 135 states and 137 transitions. Second operand has 43 states, 43 states have (on average 3.0232558139534884) internal successors, (130), 42 states have internal predecessors, (130), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:41,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:41,163 INFO L93 Difference]: Finished difference Result 173 states and 181 transitions. [2021-05-02 12:49:41,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-02 12:49:41,165 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 3.0232558139534884) internal successors, (130), 42 states have internal predecessors, (130), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 134 [2021-05-02 12:49:41,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:41,166 INFO L225 Difference]: With dead ends: 173 [2021-05-02 12:49:41,166 INFO L226 Difference]: Without dead ends: 148 [2021-05-02 12:49:41,167 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 132 SyntacticMatches, 2 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 756 ImplicationChecksByTransitivity, 2493.5ms TimeCoverageRelationStatistics Valid=311, Invalid=6331, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 12:49:41,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-05-02 12:49:41,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 147. [2021-05-02 12:49:41,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 142 states have (on average 1.0211267605633803) internal successors, (145), 142 states have internal predecessors, (145), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:41,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 149 transitions. [2021-05-02 12:49:41,176 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 149 transitions. Word has length 134 [2021-05-02 12:49:41,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:41,176 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 149 transitions. [2021-05-02 12:49:41,176 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 3.0232558139534884) internal successors, (130), 42 states have internal predecessors, (130), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:41,176 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 149 transitions. [2021-05-02 12:49:41,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-05-02 12:49:41,177 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:41,177 INFO L523 BasicCegarLoop]: trace histogram [45, 45, 39, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:41,381 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 12:49:41,381 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:41,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:41,381 INFO L82 PathProgramCache]: Analyzing trace with hash -1858507317, now seen corresponding path program 18 times [2021-05-02 12:49:41,382 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:41,382 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773333141] [2021-05-02 12:49:41,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:41,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:42,342 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:42,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:42,357 INFO L134 CoverageAnalysis]: Checked inductivity of 3015 backedges. 674 proven. 2301 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 12:49:42,358 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:42,358 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1773333141] [2021-05-02 12:49:42,358 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1773333141] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:42,358 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1262939843] [2021-05-02 12:49:42,358 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:42,729 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 21 check-sat command(s) [2021-05-02 12:49:42,729 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:49:42,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 12:49:42,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:42,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:42,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:42,813 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:44,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:44,152 INFO L134 CoverageAnalysis]: Checked inductivity of 3015 backedges. 773 proven. 57 refuted. 0 times theorem prover too weak. 2185 trivial. 0 not checked. [2021-05-02 12:49:44,153 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1262939843] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:44,153 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:44,153 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 11] total 52 [2021-05-02 12:49:44,153 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737834491] [2021-05-02 12:49:44,153 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-02 12:49:44,153 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:44,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-02 12:49:44,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=292, Invalid=2360, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 12:49:44,154 INFO L87 Difference]: Start difference. First operand 147 states and 149 transitions. Second operand has 52 states, 52 states have (on average 2.980769230769231) internal successors, (155), 51 states have internal predecessors, (155), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:50,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:50,892 INFO L93 Difference]: Finished difference Result 190 states and 201 transitions. [2021-05-02 12:49:50,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-02 12:49:50,893 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.980769230769231) internal successors, (155), 51 states have internal predecessors, (155), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 146 [2021-05-02 12:49:50,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:50,894 INFO L225 Difference]: With dead ends: 190 [2021-05-02 12:49:50,894 INFO L226 Difference]: Without dead ends: 165 [2021-05-02 12:49:50,895 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 140 SyntacticMatches, 7 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1516 ImplicationChecksByTransitivity, 6319.6ms TimeCoverageRelationStatistics Valid=1049, Invalid=10081, Unknown=0, NotChecked=0, Total=11130 [2021-05-02 12:49:50,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-05-02 12:49:50,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 157. [2021-05-02 12:49:50,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 152 states have (on average 1.019736842105263) internal successors, (155), 152 states have internal predecessors, (155), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:50,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 159 transitions. [2021-05-02 12:49:50,906 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 159 transitions. Word has length 146 [2021-05-02 12:49:50,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:50,907 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 159 transitions. [2021-05-02 12:49:50,907 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 2.980769230769231) internal successors, (155), 51 states have internal predecessors, (155), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:50,907 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 159 transitions. [2021-05-02 12:49:50,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-05-02 12:49:50,907 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:50,908 INFO L523 BasicCegarLoop]: trace histogram [48, 48, 41, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:51,117 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 12:49:51,117 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:51,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:51,117 INFO L82 PathProgramCache]: Analyzing trace with hash 1876250117, now seen corresponding path program 19 times [2021-05-02 12:49:51,117 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:51,117 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [564968673] [2021-05-02 12:49:51,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:51,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:52,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:52,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:52,240 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 833 proven. 2542 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 12:49:52,240 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:52,240 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [564968673] [2021-05-02 12:49:52,240 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [564968673] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:52,241 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [758058057] [2021-05-02 12:49:52,241 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:52,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:52,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 375 conjuncts, 86 conjunts are in the unsatisfiable core [2021-05-02 12:49:52,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:52,647 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:52,678 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 833 proven. 2542 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 12:49:52,679 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [758058057] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:52,679 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:52,679 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44] total 46 [2021-05-02 12:49:52,679 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [558078841] [2021-05-02 12:49:52,679 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 12:49:52,679 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:52,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 12:49:52,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1939, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 12:49:52,680 INFO L87 Difference]: Start difference. First operand 157 states and 159 transitions. Second operand has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:56,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:56,813 INFO L93 Difference]: Finished difference Result 190 states and 195 transitions. [2021-05-02 12:49:56,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 12:49:56,814 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 155 [2021-05-02 12:49:56,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:56,815 INFO L225 Difference]: With dead ends: 190 [2021-05-02 12:49:56,815 INFO L226 Difference]: Without dead ends: 161 [2021-05-02 12:49:56,816 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 156 SyntacticMatches, 2 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 866 ImplicationChecksByTransitivity, 2818.0ms TimeCoverageRelationStatistics Valid=341, Invalid=7315, Unknown=0, NotChecked=0, Total=7656 [2021-05-02 12:49:56,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-05-02 12:49:56,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 160. [2021-05-02 12:49:56,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 155 states have (on average 1.0193548387096774) internal successors, (158), 155 states have internal predecessors, (158), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:56,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 162 transitions. [2021-05-02 12:49:56,828 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 162 transitions. Word has length 155 [2021-05-02 12:49:56,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:56,828 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 162 transitions. [2021-05-02 12:49:56,828 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:56,828 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 162 transitions. [2021-05-02 12:49:56,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-05-02 12:49:56,829 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:56,829 INFO L523 BasicCegarLoop]: trace histogram [49, 49, 42, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:57,037 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:57,037 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:57,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:57,037 INFO L82 PathProgramCache]: Analyzing trace with hash 1237152205, now seen corresponding path program 20 times [2021-05-02 12:49:57,038 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:57,038 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1569164601] [2021-05-02 12:49:57,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:57,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:58,437 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:58,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:58,451 INFO L134 CoverageAnalysis]: Checked inductivity of 3577 backedges. 853 proven. 2667 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 12:49:58,451 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:58,451 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1569164601] [2021-05-02 12:49:58,451 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1569164601] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:58,451 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1404642559] [2021-05-02 12:49:58,451 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:58,524 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:49:58,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:49:58,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 381 conjuncts, 101 conjunts are in the unsatisfiable core [2021-05-02 12:49:58,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:59,154 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:59,165 INFO L134 CoverageAnalysis]: Checked inductivity of 3577 backedges. 0 proven. 3577 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:49:59,165 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1404642559] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:59,165 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:59,165 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 52] total 54 [2021-05-02 12:49:59,165 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398630218] [2021-05-02 12:49:59,165 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-02 12:49:59,165 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:59,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-02 12:49:59,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=2714, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 12:49:59,166 INFO L87 Difference]: Start difference. First operand 160 states and 162 transitions. Second operand has 54 states, 54 states have (on average 3.0) internal successors, (162), 53 states have internal predecessors, (162), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:04,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:04,587 INFO L93 Difference]: Finished difference Result 214 states and 226 transitions. [2021-05-02 12:50:04,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 12:50:04,588 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 3.0) internal successors, (162), 53 states have internal predecessors, (162), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 158 [2021-05-02 12:50:04,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:04,589 INFO L225 Difference]: With dead ends: 214 [2021-05-02 12:50:04,589 INFO L226 Difference]: Without dead ends: 185 [2021-05-02 12:50:04,590 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 153 SyntacticMatches, 1 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1250 ImplicationChecksByTransitivity, 3741.9ms TimeCoverageRelationStatistics Valid=391, Invalid=10321, Unknown=0, NotChecked=0, Total=10712 [2021-05-02 12:50:04,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-05-02 12:50:04,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 184. [2021-05-02 12:50:04,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 179 states have (on average 1.0167597765363128) internal successors, (182), 179 states have internal predecessors, (182), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:04,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 186 transitions. [2021-05-02 12:50:04,602 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 186 transitions. Word has length 158 [2021-05-02 12:50:04,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:04,603 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 186 transitions. [2021-05-02 12:50:04,603 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 3.0) internal successors, (162), 53 states have internal predecessors, (162), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:04,603 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 186 transitions. [2021-05-02 12:50:04,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2021-05-02 12:50:04,604 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:04,604 INFO L523 BasicCegarLoop]: trace histogram [57, 57, 50, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:04,812 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 12:50:04,813 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:04,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:04,813 INFO L82 PathProgramCache]: Analyzing trace with hash 1427588557, now seen corresponding path program 21 times [2021-05-02 12:50:04,813 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:04,813 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1315741239] [2021-05-02 12:50:04,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:04,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:06,417 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:06,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:06,431 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 1013 proven. 3775 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 12:50:06,432 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:06,432 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1315741239] [2021-05-02 12:50:06,432 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1315741239] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:06,432 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [706453243] [2021-05-02 12:50:06,432 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:06,581 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-05-02 12:50:06,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:50:06,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 12:50:06,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:07,571 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:07,591 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 1142 proven. 77 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2021-05-02 12:50:07,592 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [706453243] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:07,592 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:07,592 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 12] total 64 [2021-05-02 12:50:07,592 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550791869] [2021-05-02 12:50:07,593 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2021-05-02 12:50:07,593 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:07,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-05-02 12:50:07,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=549, Invalid=3483, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 12:50:07,594 INFO L87 Difference]: Start difference. First operand 184 states and 186 transitions. Second operand has 64 states, 64 states have (on average 2.984375) internal successors, (191), 63 states have internal predecessors, (191), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:14,194 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 40 [2021-05-02 12:50:15,552 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 40 [2021-05-02 12:50:16,944 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 42 [2021-05-02 12:50:18,684 WARN L205 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 12:50:23,263 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 12:50:23,687 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 40 [2021-05-02 12:50:23,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:23,688 INFO L93 Difference]: Finished difference Result 242 states and 256 transitions. [2021-05-02 12:50:23,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-05-02 12:50:23,689 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.984375) internal successors, (191), 63 states have internal predecessors, (191), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 182 [2021-05-02 12:50:23,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:23,690 INFO L225 Difference]: With dead ends: 242 [2021-05-02 12:50:23,690 INFO L226 Difference]: Without dead ends: 213 [2021-05-02 12:50:23,691 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 182 SyntacticMatches, 1 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2733 ImplicationChecksByTransitivity, 14917.4ms TimeCoverageRelationStatistics Valid=2215, Invalid=16691, Unknown=0, NotChecked=0, Total=18906 [2021-05-02 12:50:23,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2021-05-02 12:50:23,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 193. [2021-05-02 12:50:23,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 188 states have (on average 1.0159574468085106) internal successors, (191), 188 states have internal predecessors, (191), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:23,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 195 transitions. [2021-05-02 12:50:23,708 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 195 transitions. Word has length 182 [2021-05-02 12:50:23,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:23,709 INFO L480 AbstractCegarLoop]: Abstraction has 193 states and 195 transitions. [2021-05-02 12:50:23,709 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 64 states, 64 states have (on average 2.984375) internal successors, (191), 63 states have internal predecessors, (191), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:23,709 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 195 transitions. [2021-05-02 12:50:23,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-05-02 12:50:23,710 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:23,710 INFO L523 BasicCegarLoop]: trace histogram [60, 60, 52, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:23,917 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:23,918 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:23,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:23,918 INFO L82 PathProgramCache]: Analyzing trace with hash -67117373, now seen corresponding path program 22 times [2021-05-02 12:50:23,918 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:23,918 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [10725714] [2021-05-02 12:50:23,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:23,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:25,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:25,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:25,880 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 1211 proven. 4082 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 12:50:25,880 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:25,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [10725714] [2021-05-02 12:50:25,880 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [10725714] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:25,881 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1601124148] [2021-05-02 12:50:25,881 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:25,973 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:50:25,973 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:50:25,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 447 conjuncts, 108 conjunts are in the unsatisfiable core [2021-05-02 12:50:25,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:26,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:26,484 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 1211 proven. 4082 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 12:50:26,484 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1601124148] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:26,484 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:26,484 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 55] total 57 [2021-05-02 12:50:26,484 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784671029] [2021-05-02 12:50:26,485 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-02 12:50:26,485 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:26,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-02 12:50:26,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=3028, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 12:50:26,486 INFO L87 Difference]: Start difference. First operand 193 states and 195 transitions. Second operand has 57 states, 57 states have (on average 3.017543859649123) internal successors, (172), 56 states have internal predecessors, (172), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:33,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:33,618 INFO L93 Difference]: Finished difference Result 229 states and 234 transitions. [2021-05-02 12:50:33,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-02 12:50:33,619 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 3.017543859649123) internal successors, (172), 56 states have internal predecessors, (172), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 191 [2021-05-02 12:50:33,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:33,620 INFO L225 Difference]: With dead ends: 229 [2021-05-02 12:50:33,620 INFO L226 Difference]: Without dead ends: 197 [2021-05-02 12:50:33,621 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 192 SyntacticMatches, 2 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1383 ImplicationChecksByTransitivity, 4708.2ms TimeCoverageRelationStatistics Valid=429, Invalid=11561, Unknown=0, NotChecked=0, Total=11990 [2021-05-02 12:50:33,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-05-02 12:50:33,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 196. [2021-05-02 12:50:33,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 191 states have (on average 1.0157068062827226) internal successors, (194), 191 states have internal predecessors, (194), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:33,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 198 transitions. [2021-05-02 12:50:33,636 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 198 transitions. Word has length 191 [2021-05-02 12:50:33,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:33,637 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 198 transitions. [2021-05-02 12:50:33,637 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 3.017543859649123) internal successors, (172), 56 states have internal predecessors, (172), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:33,637 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 198 transitions. [2021-05-02 12:50:33,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2021-05-02 12:50:33,638 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:33,638 INFO L523 BasicCegarLoop]: trace histogram [61, 61, 53, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:33,856 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 12:50:33,857 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:33,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:33,857 INFO L82 PathProgramCache]: Analyzing trace with hash 1324334731, now seen corresponding path program 23 times [2021-05-02 12:50:33,857 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:33,857 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1963684505] [2021-05-02 12:50:33,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:33,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:35,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:35,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:35,911 INFO L134 CoverageAnalysis]: Checked inductivity of 5551 backedges. 1234 proven. 4240 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 12:50:35,911 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:35,911 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1963684505] [2021-05-02 12:50:35,911 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1963684505] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:35,911 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [764696012] [2021-05-02 12:50:35,912 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:52:41,159 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 62 check-sat command(s) [2021-05-02 12:52:41,159 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:52:41,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 453 conjuncts, 158 conjunts are in the unsatisfiable core [2021-05-02 12:52:41,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:52:43,098 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:52:43,125 INFO L134 CoverageAnalysis]: Checked inductivity of 5551 backedges. 946 proven. 4565 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 12:52:43,126 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [764696012] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:52:43,126 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:52:43,126 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 58] total 60 [2021-05-02 12:52:43,126 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1288877343] [2021-05-02 12:52:43,126 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-02 12:52:43,126 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:52:43,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-02 12:52:43,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=3369, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 12:52:43,127 INFO L87 Difference]: Start difference. First operand 196 states and 198 transitions. Second operand has 60 states, 60 states have (on average 3.0166666666666666) internal successors, (181), 59 states have internal predecessors, (181), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:52:50,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:52:50,283 INFO L93 Difference]: Finished difference Result 238 states and 245 transitions. [2021-05-02 12:52:50,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-02 12:52:50,284 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 3.0166666666666666) internal successors, (181), 59 states have internal predecessors, (181), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 194 [2021-05-02 12:52:50,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:52:50,285 INFO L225 Difference]: With dead ends: 238 [2021-05-02 12:52:50,285 INFO L226 Difference]: Without dead ends: 206 [2021-05-02 12:52:50,286 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 309 GetRequests, 149 SyntacticMatches, 46 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1640 ImplicationChecksByTransitivity, 6207.9ms TimeCoverageRelationStatistics Valid=449, Invalid=12891, Unknown=0, NotChecked=0, Total=13340 [2021-05-02 12:52:50,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2021-05-02 12:52:50,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 205. [2021-05-02 12:52:50,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 200 states have (on average 1.015) internal successors, (203), 200 states have internal predecessors, (203), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:52:50,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 207 transitions. [2021-05-02 12:52:50,304 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 207 transitions. Word has length 194 [2021-05-02 12:52:50,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:52:50,304 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 207 transitions. [2021-05-02 12:52:50,304 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 60 states have (on average 3.0166666666666666) internal successors, (181), 59 states have internal predecessors, (181), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:52:50,304 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 207 transitions. [2021-05-02 12:52:50,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2021-05-02 12:52:50,305 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:52:50,305 INFO L523 BasicCegarLoop]: trace histogram [64, 64, 56, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:52:50,512 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 12:52:50,513 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:52:50,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:52:50,513 INFO L82 PathProgramCache]: Analyzing trace with hash 694203587, now seen corresponding path program 24 times [2021-05-02 12:52:50,513 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:52:50,513 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [629747952] [2021-05-02 12:52:50,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:52:50,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:52:52,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:52:52,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:52:52,335 INFO L134 CoverageAnalysis]: Checked inductivity of 6112 backedges. 1303 proven. 4732 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 12:52:52,335 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:52:52,335 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [629747952] [2021-05-02 12:52:52,335 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [629747952] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:52:52,335 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1455438024] [2021-05-02 12:52:52,335 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:52:53,384 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 27 check-sat command(s) [2021-05-02 12:52:53,384 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:52:53,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 66 conjunts are in the unsatisfiable core [2021-05-02 12:52:53,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:52:53,467 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:52:55,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:52:55,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:52:58,838 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:52:58,856 INFO L134 CoverageAnalysis]: Checked inductivity of 6112 backedges. 1840 proven. 1209 refuted. 0 times theorem prover too weak. 3063 trivial. 0 not checked. [2021-05-02 12:52:58,857 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1455438024] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:52:58,857 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:52:58,857 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 29] total 87 [2021-05-02 12:52:58,857 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630150597] [2021-05-02 12:52:58,858 INFO L460 AbstractCegarLoop]: Interpolant automaton has 87 states [2021-05-02 12:52:58,858 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:52:58,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-05-02 12:52:58,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1250, Invalid=6232, Unknown=0, NotChecked=0, Total=7482 [2021-05-02 12:52:58,859 INFO L87 Difference]: Start difference. First operand 205 states and 207 transitions. Second operand has 87 states, 87 states have (on average 2.7586206896551726) internal successors, (240), 86 states have internal predecessors, (240), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:07,801 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 45 [2021-05-02 12:53:08,429 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 40 [2021-05-02 12:53:14,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:14,208 INFO L93 Difference]: Finished difference Result 275 states and 292 transitions. [2021-05-02 12:53:14,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-05-02 12:53:14,208 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 2.7586206896551726) internal successors, (240), 86 states have internal predecessors, (240), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 203 [2021-05-02 12:53:14,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:14,209 INFO L225 Difference]: With dead ends: 275 [2021-05-02 12:53:14,209 INFO L226 Difference]: Without dead ends: 243 [2021-05-02 12:53:14,211 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 174 SyntacticMatches, 14 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5053 ImplicationChecksByTransitivity, 16159.6ms TimeCoverageRelationStatistics Valid=4057, Invalid=26045, Unknown=0, NotChecked=0, Total=30102 [2021-05-02 12:53:14,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2021-05-02 12:53:14,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 214. [2021-05-02 12:53:14,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 209 states have (on average 1.014354066985646) internal successors, (212), 209 states have internal predecessors, (212), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:14,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 216 transitions. [2021-05-02 12:53:14,226 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 216 transitions. Word has length 203 [2021-05-02 12:53:14,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:14,227 INFO L480 AbstractCegarLoop]: Abstraction has 214 states and 216 transitions. [2021-05-02 12:53:14,227 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 87 states, 87 states have (on average 2.7586206896551726) internal successors, (240), 86 states have internal predecessors, (240), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:14,227 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 216 transitions. [2021-05-02 12:53:14,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2021-05-02 12:53:14,228 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:14,228 INFO L523 BasicCegarLoop]: trace histogram [67, 67, 58, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:14,432 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 12:53:14,433 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:14,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:14,433 INFO L82 PathProgramCache]: Analyzing trace with hash 965135885, now seen corresponding path program 25 times [2021-05-02 12:53:14,433 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:14,433 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [20525520] [2021-05-02 12:53:14,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:14,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:16,673 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:16,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:16,687 INFO L134 CoverageAnalysis]: Checked inductivity of 6700 backedges. 1525 proven. 5075 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:53:16,687 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:16,687 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [20525520] [2021-05-02 12:53:16,687 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [20525520] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:16,687 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2033287962] [2021-05-02 12:53:16,687 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:16,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:16,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 489 conjuncts, 120 conjunts are in the unsatisfiable core [2021-05-02 12:53:16,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:17,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:17,391 INFO L134 CoverageAnalysis]: Checked inductivity of 6700 backedges. 1525 proven. 5075 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:53:17,391 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2033287962] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:17,391 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:17,391 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 61] total 63 [2021-05-02 12:53:17,391 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29093325] [2021-05-02 12:53:17,391 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2021-05-02 12:53:17,391 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:17,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-05-02 12:53:17,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=3724, Unknown=0, NotChecked=0, Total=3906 [2021-05-02 12:53:17,392 INFO L87 Difference]: Start difference. First operand 214 states and 216 transitions. Second operand has 63 states, 63 states have (on average 3.015873015873016) internal successors, (190), 62 states have internal predecessors, (190), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:26,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:26,436 INFO L93 Difference]: Finished difference Result 253 states and 258 transitions. [2021-05-02 12:53:26,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-05-02 12:53:26,437 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 3.015873015873016) internal successors, (190), 62 states have internal predecessors, (190), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 212 [2021-05-02 12:53:26,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:26,438 INFO L225 Difference]: With dead ends: 253 [2021-05-02 12:53:26,438 INFO L226 Difference]: Without dead ends: 218 [2021-05-02 12:53:26,439 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 213 SyntacticMatches, 2 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1716 ImplicationChecksByTransitivity, 5628.9ms TimeCoverageRelationStatistics Valid=477, Invalid=14285, Unknown=0, NotChecked=0, Total=14762 [2021-05-02 12:53:26,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2021-05-02 12:53:26,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 217. [2021-05-02 12:53:26,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 212 states have (on average 1.0141509433962264) internal successors, (215), 212 states have internal predecessors, (215), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:26,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 219 transitions. [2021-05-02 12:53:26,455 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 219 transitions. Word has length 212 [2021-05-02 12:53:26,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:26,456 INFO L480 AbstractCegarLoop]: Abstraction has 217 states and 219 transitions. [2021-05-02 12:53:26,456 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 63 states, 63 states have (on average 3.015873015873016) internal successors, (190), 62 states have internal predecessors, (190), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:26,456 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 219 transitions. [2021-05-02 12:53:26,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2021-05-02 12:53:26,457 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:26,457 INFO L523 BasicCegarLoop]: trace histogram [68, 68, 59, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:26,676 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:26,677 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:26,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:26,677 INFO L82 PathProgramCache]: Analyzing trace with hash -134079675, now seen corresponding path program 26 times [2021-05-02 12:53:26,677 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:26,677 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [304853671] [2021-05-02 12:53:26,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:26,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:29,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:29,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:29,138 INFO L134 CoverageAnalysis]: Checked inductivity of 6902 backedges. 1551 proven. 5251 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:53:29,138 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:29,139 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [304853671] [2021-05-02 12:53:29,139 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [304853671] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:29,139 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [611594656] [2021-05-02 12:53:29,139 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:29,245 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:53:29,247 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:29,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 495 conjuncts, 139 conjunts are in the unsatisfiable core [2021-05-02 12:53:29,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:30,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:30,388 INFO L134 CoverageAnalysis]: Checked inductivity of 6902 backedges. 0 proven. 6902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:53:30,388 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [611594656] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:30,388 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:30,389 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 71] total 73 [2021-05-02 12:53:30,389 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [860753661] [2021-05-02 12:53:30,389 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2021-05-02 12:53:30,389 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:30,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-05-02 12:53:30,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=5053, Unknown=0, NotChecked=0, Total=5256 [2021-05-02 12:53:30,390 INFO L87 Difference]: Start difference. First operand 217 states and 219 transitions. Second operand has 73 states, 73 states have (on average 3.0) internal successors, (219), 72 states have internal predecessors, (219), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:42,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:42,627 INFO L93 Difference]: Finished difference Result 283 states and 297 transitions. [2021-05-02 12:53:42,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-05-02 12:53:42,627 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 3.0) internal successors, (219), 72 states have internal predecessors, (219), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 215 [2021-05-02 12:53:42,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:42,629 INFO L225 Difference]: With dead ends: 283 [2021-05-02 12:53:42,629 INFO L226 Difference]: Without dead ends: 248 [2021-05-02 12:53:42,630 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 208 SyntacticMatches, 1 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2377 ImplicationChecksByTransitivity, 7392.8ms TimeCoverageRelationStatistics Valid=539, Invalid=19483, Unknown=0, NotChecked=0, Total=20022 [2021-05-02 12:53:42,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2021-05-02 12:53:42,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 247. [2021-05-02 12:53:42,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 247 states, 242 states have (on average 1.012396694214876) internal successors, (245), 242 states have internal predecessors, (245), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:42,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 249 transitions. [2021-05-02 12:53:42,651 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 249 transitions. Word has length 215 [2021-05-02 12:53:42,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:42,651 INFO L480 AbstractCegarLoop]: Abstraction has 247 states and 249 transitions. [2021-05-02 12:53:42,651 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 73 states, 73 states have (on average 3.0) internal successors, (219), 72 states have internal predecessors, (219), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:42,651 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 249 transitions. [2021-05-02 12:53:42,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2021-05-02 12:53:42,652 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:42,653 INFO L523 BasicCegarLoop]: trace histogram [78, 78, 69, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:42,875 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-02 12:53:42,876 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:42,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:42,876 INFO L82 PathProgramCache]: Analyzing trace with hash 1407668805, now seen corresponding path program 27 times [2021-05-02 12:53:42,876 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:42,876 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2076154300] [2021-05-02 12:53:42,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:42,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:45,934 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:45,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:45,952 INFO L134 CoverageAnalysis]: Checked inductivity of 9087 backedges. 1811 proven. 7176 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:53:45,952 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:45,952 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2076154300] [2021-05-02 12:53:45,952 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2076154300] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:45,952 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1052968852] [2021-05-02 12:53:45,952 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:46,133 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-05-02 12:53:46,133 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:46,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 12:53:46,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:48,510 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:48,527 INFO L134 CoverageAnalysis]: Checked inductivity of 9087 backedges. 1991 proven. 126 refuted. 0 times theorem prover too weak. 6970 trivial. 0 not checked. [2021-05-02 12:53:48,527 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1052968852] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:48,527 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:48,527 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 14] total 85 [2021-05-02 12:53:48,527 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737541125] [2021-05-02 12:53:48,528 INFO L460 AbstractCegarLoop]: Interpolant automaton has 85 states [2021-05-02 12:53:48,528 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:48,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2021-05-02 12:53:48,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=823, Invalid=6317, Unknown=0, NotChecked=0, Total=7140 [2021-05-02 12:53:48,529 INFO L87 Difference]: Start difference. First operand 247 states and 249 transitions. Second operand has 85 states, 85 states have (on average 2.988235294117647) internal successors, (254), 84 states have internal predecessors, (254), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:02,438 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 40 [2021-05-02 12:54:03,278 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 12:54:04,655 WARN L205 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 40 [2021-05-02 12:54:06,750 WARN L205 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 42 [2021-05-02 12:54:10,287 WARN L205 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 42 [2021-05-02 12:54:12,917 WARN L205 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 42 [2021-05-02 12:54:15,373 WARN L205 SmtUtils]: Spent 369.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 42 [2021-05-02 12:54:16,771 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 42 [2021-05-02 12:54:18,090 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 12:54:22,919 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 40 [2021-05-02 12:54:24,079 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 40 [2021-05-02 12:54:25,568 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 40 [2021-05-02 12:54:26,347 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 12:54:27,430 WARN L205 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 40 [2021-05-02 12:54:27,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:27,432 INFO L93 Difference]: Finished difference Result 314 states and 329 transitions. [2021-05-02 12:54:27,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-05-02 12:54:27,432 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 85 states have (on average 2.988235294117647) internal successors, (254), 84 states have internal predecessors, (254), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 245 [2021-05-02 12:54:27,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:27,433 INFO L225 Difference]: With dead ends: 314 [2021-05-02 12:54:27,433 INFO L226 Difference]: Without dead ends: 279 [2021-05-02 12:54:27,435 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 243 SyntacticMatches, 3 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4718 ImplicationChecksByTransitivity, 35347.9ms TimeCoverageRelationStatistics Valid=3303, Invalid=29639, Unknown=0, NotChecked=0, Total=32942 [2021-05-02 12:54:27,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2021-05-02 12:54:27,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 256. [2021-05-02 12:54:27,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 251 states have (on average 1.0119521912350598) internal successors, (254), 251 states have internal predecessors, (254), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:27,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 258 transitions. [2021-05-02 12:54:27,456 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 258 transitions. Word has length 245 [2021-05-02 12:54:27,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:27,457 INFO L480 AbstractCegarLoop]: Abstraction has 256 states and 258 transitions. [2021-05-02 12:54:27,457 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 85 states, 85 states have (on average 2.988235294117647) internal successors, (254), 84 states have internal predecessors, (254), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:27,457 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 258 transitions. [2021-05-02 12:54:27,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2021-05-02 12:54:27,458 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:27,458 INFO L523 BasicCegarLoop]: trace histogram [81, 81, 71, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:27,662 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:27,662 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:27,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:27,662 INFO L82 PathProgramCache]: Analyzing trace with hash 1768941899, now seen corresponding path program 28 times [2021-05-02 12:54:27,662 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:27,663 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [444752314] [2021-05-02 12:54:27,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:27,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:31,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:31,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:31,851 INFO L134 CoverageAnalysis]: Checked inductivity of 9801 backedges. 2078 proven. 7597 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 12:54:31,852 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:31,852 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [444752314] [2021-05-02 12:54:31,852 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [444752314] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:31,852 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1776273628] [2021-05-02 12:54:31,852 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:31,950 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:54:31,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:54:31,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 573 conjuncts, 146 conjunts are in the unsatisfiable core [2021-05-02 12:54:31,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:32,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:32,847 INFO L134 CoverageAnalysis]: Checked inductivity of 9801 backedges. 2078 proven. 7597 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 12:54:32,848 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1776273628] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:32,848 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:32,848 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 74] total 76 [2021-05-02 12:54:32,848 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618559733] [2021-05-02 12:54:32,849 INFO L460 AbstractCegarLoop]: Interpolant automaton has 76 states [2021-05-02 12:54:32,849 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:32,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-05-02 12:54:32,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=5479, Unknown=0, NotChecked=0, Total=5700 [2021-05-02 12:54:32,850 INFO L87 Difference]: Start difference. First operand 256 states and 258 transitions. Second operand has 76 states, 76 states have (on average 3.013157894736842) internal successors, (229), 75 states have internal predecessors, (229), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:51,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:51,015 INFO L93 Difference]: Finished difference Result 298 states and 303 transitions. [2021-05-02 12:54:51,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-05-02 12:54:51,015 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 3.013157894736842) internal successors, (229), 75 states have internal predecessors, (229), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 254 [2021-05-02 12:54:51,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:51,017 INFO L225 Difference]: With dead ends: 298 [2021-05-02 12:54:51,017 INFO L226 Difference]: Without dead ends: 260 [2021-05-02 12:54:51,018 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 255 SyntacticMatches, 2 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2561 ImplicationChecksByTransitivity, 10183.7ms TimeCoverageRelationStatistics Valid=581, Invalid=21175, Unknown=0, NotChecked=0, Total=21756 [2021-05-02 12:54:51,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-05-02 12:54:51,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 259. [2021-05-02 12:54:51,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 254 states have (on average 1.0118110236220472) internal successors, (257), 254 states have internal predecessors, (257), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:51,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 261 transitions. [2021-05-02 12:54:51,039 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 261 transitions. Word has length 254 [2021-05-02 12:54:51,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:51,040 INFO L480 AbstractCegarLoop]: Abstraction has 259 states and 261 transitions. [2021-05-02 12:54:51,040 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 76 states, 76 states have (on average 3.013157894736842) internal successors, (229), 75 states have internal predecessors, (229), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:51,040 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 261 transitions. [2021-05-02 12:54:51,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2021-05-02 12:54:51,041 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:51,041 INFO L523 BasicCegarLoop]: trace histogram [82, 82, 72, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:51,265 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-02 12:54:51,265 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:51,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:51,266 INFO L82 PathProgramCache]: Analyzing trace with hash -1295306621, now seen corresponding path program 29 times [2021-05-02 12:54:51,266 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:51,266 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [521066932] [2021-05-02 12:54:51,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:51,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:55,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:55,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:55,987 INFO L134 CoverageAnalysis]: Checked inductivity of 10045 backedges. 2107 proven. 7812 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 12:54:55,987 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:55,987 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [521066932] [2021-05-02 12:54:55,987 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [521066932] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:55,987 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [882975986] [2021-05-02 12:54:55,987 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true