/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/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/nested5-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 18:52:34,122 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 18:52:34,124 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 18:52:34,142 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 18:52:34,149 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 18:52:34,149 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 18:52:34,150 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 18:52:34,151 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 18:52:34,151 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 18:52:34,152 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 18:52:34,153 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 18:52:34,154 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 18:52:34,155 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 18:52:34,156 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 18:52:34,156 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 18:52:34,157 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 18:52:34,159 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 18:52:34,164 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 18:52:34,165 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 18:52:34,165 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 18:52:34,166 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 18:52:34,173 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 18:52:34,174 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 18:52:34,174 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 18:52:34,175 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 18:52:34,175 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 18:52:34,175 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 18:52:34,175 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 18:52:34,175 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 18:52:34,175 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 18:52:34,175 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 18:52:34,176 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 18:52:34,176 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 18:52:34,176 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 18:52:34,176 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 18:52:34,176 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 18:52:34,176 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 18:52:34,176 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 18:52:34,176 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 18:52:34,177 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 18:52:34,177 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 18:52:34,177 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 18:52:34,177 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 18:52:34,178 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 18:52:34,421 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 18:52:34,438 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 18:52:34,440 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 18:52:34,441 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 18:52:34,442 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 18:52:34,442 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/nested5-2.c [2021-05-02 18:52:34,486 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f1fc3970e/db4d89ca34a145c8b147ebf491996646/FLAGc698f92de [2021-05-02 18:52:34,832 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 18:52:34,832 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested5-2.c [2021-05-02 18:52:34,836 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f1fc3970e/db4d89ca34a145c8b147ebf491996646/FLAGc698f92de [2021-05-02 18:52:34,849 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f1fc3970e/db4d89ca34a145c8b147ebf491996646 [2021-05-02 18:52:34,851 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 18:52:34,852 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 18:52:34,856 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 18:52:34,857 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 18:52:34,859 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 18:52:34,860 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:52:34" (1/1) ... [2021-05-02 18:52:34,860 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5440a7c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:52:34, skipping insertion in model container [2021-05-02 18:52:34,861 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:52:34" (1/1) ... [2021-05-02 18:52:34,865 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 18:52:34,876 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 18:52:34,978 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/nested5-2.c[321,334] [2021-05-02 18:52:34,988 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:52:34,993 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 18:52:35,051 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/nested5-2.c[321,334] [2021-05-02 18:52:35,056 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:52:35,064 INFO L208 MainTranslator]: Completed translation [2021-05-02 18:52:35,064 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:52:35 WrapperNode [2021-05-02 18:52:35,064 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 18:52:35,065 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 18:52:35,065 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 18:52:35,065 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 18:52:35,073 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:52:35" (1/1) ... [2021-05-02 18:52:35,078 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:52:35" (1/1) ... [2021-05-02 18:52:35,082 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:52:35" (1/1) ... [2021-05-02 18:52:35,083 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:52:35" (1/1) ... [2021-05-02 18:52:35,091 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:52:35" (1/1) ... [2021-05-02 18:52:35,095 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:52:35" (1/1) ... [2021-05-02 18:52:35,099 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:52:35" (1/1) ... [2021-05-02 18:52:35,102 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 18:52:35,103 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 18:52:35,103 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 18:52:35,103 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 18:52:35,104 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:52:35" (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 18:52:35,159 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 18:52:35,159 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 18:52:35,160 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 18:52:35,160 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 18:52:35,160 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 18:52:35,160 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 18:52:35,160 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 18:52:35,160 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 18:52:35,160 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 18:52:35,160 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 18:52:35,160 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 18:52:35,161 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 18:52:35,161 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 18:52:35,161 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 18:52:35,161 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 18:52:35,161 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 18:52:35,161 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 18:52:35,336 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 18:52:35,336 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2021-05-02 18:52:35,337 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:52:35 BoogieIcfgContainer [2021-05-02 18:52:35,337 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 18:52:35,353 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 18:52:35,353 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 18:52:35,354 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 18:52:35,355 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:52:35" (1/1) ... [2021-05-02 18:52:35,366 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:52:35 BasicIcfg [2021-05-02 18:52:35,366 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 18:52:35,367 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 18:52:35,367 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 18:52:35,385 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 18:52:35,385 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 06:52:34" (1/4) ... [2021-05-02 18:52:35,386 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35203d7d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:52:35, skipping insertion in model container [2021-05-02 18:52:35,386 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:52:35" (2/4) ... [2021-05-02 18:52:35,386 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35203d7d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:52:35, skipping insertion in model container [2021-05-02 18:52:35,386 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:52:35" (3/4) ... [2021-05-02 18:52:35,386 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35203d7d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 06:52:35, skipping insertion in model container [2021-05-02 18:52:35,386 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:52:35" (4/4) ... [2021-05-02 18:52:35,387 INFO L111 eAbstractionObserver]: Analyzing ICFG nested5-2.cJordan [2021-05-02 18:52:35,390 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 18:52:35,393 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 18:52:35,410 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 18:52:35,430 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 18:52:35,430 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 18:52:35,430 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 18:52:35,430 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 18:52:35,430 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 18:52:35,430 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 18:52:35,430 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 18:52:35,430 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 18:52:35,455 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 20 states have (on average 1.6) internal successors, (32), 21 states have internal predecessors, (32), 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 18:52:35,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 18:52:35,459 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:35,459 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:35,459 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:35,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:35,462 INFO L82 PathProgramCache]: Analyzing trace with hash -1895308246, now seen corresponding path program 1 times [2021-05-02 18:52:35,484 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:35,484 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1577101868] [2021-05-02 18:52:35,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:35,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:35,636 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:35,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:35,647 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 18:52:35,647 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:35,647 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1577101868] [2021-05-02 18:52:35,648 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1577101868] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:52:35,648 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:52:35,648 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 18:52:35,648 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187438418] [2021-05-02 18:52:35,651 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 18:52:35,651 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:35,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 18:52:35,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:52:35,661 INFO L87 Difference]: Start difference. First operand has 28 states, 20 states have (on average 1.6) internal successors, (32), 21 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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 18:52:35,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:35,686 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2021-05-02 18:52:35,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 18:52:35,687 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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 15 [2021-05-02 18:52:35,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:35,691 INFO L225 Difference]: With dead ends: 28 [2021-05-02 18:52:35,691 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 18:52:35,692 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 25.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:52:35,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 18:52:35,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-02 18:52:35,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:35,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2021-05-02 18:52:35,711 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 15 [2021-05-02 18:52:35,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:35,711 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2021-05-02 18:52:35,711 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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 18:52:35,711 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2021-05-02 18:52:35,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 18:52:35,712 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:35,712 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:35,712 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 18:52:35,712 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:35,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:35,713 INFO L82 PathProgramCache]: Analyzing trace with hash -1894384725, now seen corresponding path program 1 times [2021-05-02 18:52:35,713 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:35,713 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [683425854] [2021-05-02 18:52:35,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:35,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:35,785 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:35,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:35,809 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 18:52:35,809 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:35,809 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [683425854] [2021-05-02 18:52:35,810 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [683425854] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:52:35,810 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:52:35,811 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 18:52:35,811 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1320073749] [2021-05-02 18:52:35,812 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 18:52:35,812 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:35,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 18:52:35,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 18:52:35,816 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 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 18:52:35,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:35,935 INFO L93 Difference]: Finished difference Result 32 states and 39 transitions. [2021-05-02 18:52:35,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 18:52:35,936 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 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 15 [2021-05-02 18:52:35,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:35,937 INFO L225 Difference]: With dead ends: 32 [2021-05-02 18:52:35,937 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 18:52:35,937 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 60.9ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 18:52:35,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 18:52:35,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2021-05-02 18:52:35,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:35,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2021-05-02 18:52:35,940 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 15 [2021-05-02 18:52:35,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:35,940 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2021-05-02 18:52:35,940 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 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 18:52:35,940 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2021-05-02 18:52:35,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 18:52:35,941 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:35,941 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:35,941 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 18:52:35,941 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:35,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:35,942 INFO L82 PathProgramCache]: Analyzing trace with hash 1473809801, now seen corresponding path program 1 times [2021-05-02 18:52:35,942 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:35,942 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [212844143] [2021-05-02 18:52:35,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:35,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:36,053 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:36,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:36,067 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 18:52:36,068 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:36,068 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [212844143] [2021-05-02 18:52:36,068 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [212844143] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:36,068 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [393393777] [2021-05-02 18:52:36,068 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 18:52:36,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:36,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 18:52:36,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:36,180 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 18:52:36,180 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [393393777] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:36,180 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:36,180 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 18:52:36,180 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2008304049] [2021-05-02 18:52:36,181 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 18:52:36,181 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:36,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 18:52:36,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 18:52:36,181 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 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 18:52:36,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:36,287 INFO L93 Difference]: Finished difference Result 34 states and 41 transitions. [2021-05-02 18:52:36,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 18:52:36,287 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 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 17 [2021-05-02 18:52:36,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:36,290 INFO L225 Difference]: With dead ends: 34 [2021-05-02 18:52:36,290 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 18:52:36,291 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 80.7ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:52:36,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 18:52:36,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 26. [2021-05-02 18:52:36,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 20 states have (on average 1.25) internal successors, (25), 20 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:36,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2021-05-02 18:52:36,299 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 17 [2021-05-02 18:52:36,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:36,299 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2021-05-02 18:52:36,299 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 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 18:52:36,299 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2021-05-02 18:52:36,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 18:52:36,300 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:36,300 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:36,516 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 18:52:36,516 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:36,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:36,517 INFO L82 PathProgramCache]: Analyzing trace with hash -96591897, now seen corresponding path program 2 times [2021-05-02 18:52:36,517 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:36,517 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [532051116] [2021-05-02 18:52:36,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:36,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:36,585 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:36,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:36,601 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:36,601 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:36,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [532051116] [2021-05-02 18:52:36,601 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [532051116] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:36,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1852626149] [2021-05-02 18:52:36,601 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 18:52:36,640 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:52:36,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:36,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 18:52:36,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:36,726 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:36,746 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:36,746 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1852626149] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:36,746 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:36,747 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 18:52:36,747 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333791093] [2021-05-02 18:52:36,747 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 18:52:36,747 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:36,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 18:52:36,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 18:52:36,748 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:36,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:36,931 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2021-05-02 18:52:36,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 18:52:36,932 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-02 18:52:36,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:36,932 INFO L225 Difference]: With dead ends: 36 [2021-05-02 18:52:36,932 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 18:52:36,933 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 120.3ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:52:36,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 18:52:36,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 28. [2021-05-02 18:52:36,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:36,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2021-05-02 18:52:36,935 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 19 [2021-05-02 18:52:36,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:36,935 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2021-05-02 18:52:36,935 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:36,935 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2021-05-02 18:52:36,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 18:52:36,936 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:36,936 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:37,151 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:37,151 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:37,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:37,152 INFO L82 PathProgramCache]: Analyzing trace with hash -1719102779, now seen corresponding path program 3 times [2021-05-02 18:52:37,152 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:37,152 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [298505118] [2021-05-02 18:52:37,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:37,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:37,219 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:37,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:37,225 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:37,225 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:37,225 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [298505118] [2021-05-02 18:52:37,225 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [298505118] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:37,225 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1776336006] [2021-05-02 18:52:37,225 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 18:52:37,289 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 18:52:37,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:37,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 18:52:37,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:37,350 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:37,358 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:37,358 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1776336006] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:37,358 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:37,358 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 18:52:37,358 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363162153] [2021-05-02 18:52:37,359 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 18:52:37,359 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:37,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 18:52:37,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:52:37,360 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:37,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:37,548 INFO L93 Difference]: Finished difference Result 38 states and 45 transitions. [2021-05-02 18:52:37,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 18:52:37,548 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2021-05-02 18:52:37,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:37,549 INFO L225 Difference]: With dead ends: 38 [2021-05-02 18:52:37,549 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 18:52:37,549 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 131.7ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:52:37,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 18:52:37,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 30. [2021-05-02 18:52:37,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 24 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:37,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2021-05-02 18:52:37,552 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 21 [2021-05-02 18:52:37,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:37,552 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2021-05-02 18:52:37,552 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:37,552 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2021-05-02 18:52:37,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 18:52:37,552 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:37,552 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:37,768 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:37,768 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:37,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:37,769 INFO L82 PathProgramCache]: Analyzing trace with hash -1878931933, now seen corresponding path program 4 times [2021-05-02 18:52:37,769 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:37,769 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [337803882] [2021-05-02 18:52:37,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:37,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:37,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:37,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:37,849 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:37,849 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:37,849 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [337803882] [2021-05-02 18:52:37,849 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [337803882] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:37,849 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [375556158] [2021-05-02 18:52:37,849 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:37,883 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:52:37,883 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:37,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 18:52:37,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:37,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:37,942 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:37,942 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [375556158] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:37,942 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:37,942 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 18:52:37,943 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332933157] [2021-05-02 18:52:37,943 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 18:52:37,943 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:37,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 18:52:37,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-02 18:52:37,945 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 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 18:52:38,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:38,173 INFO L93 Difference]: Finished difference Result 40 states and 47 transitions. [2021-05-02 18:52:38,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 18:52:38,174 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 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 23 [2021-05-02 18:52:38,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:38,174 INFO L225 Difference]: With dead ends: 40 [2021-05-02 18:52:38,174 INFO L226 Difference]: Without dead ends: 40 [2021-05-02 18:52:38,174 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 165.7ms TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:52:38,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-02 18:52:38,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 32. [2021-05-02 18:52:38,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 26 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:38,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2021-05-02 18:52:38,177 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 23 [2021-05-02 18:52:38,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:38,177 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2021-05-02 18:52:38,177 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 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 18:52:38,177 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2021-05-02 18:52:38,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 18:52:38,177 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:38,177 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:38,392 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:38,392 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:38,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:38,393 INFO L82 PathProgramCache]: Analyzing trace with hash -855926271, now seen corresponding path program 5 times [2021-05-02 18:52:38,393 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:38,393 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [286539254] [2021-05-02 18:52:38,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:38,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:38,467 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:38,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:38,473 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:38,473 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:38,473 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [286539254] [2021-05-02 18:52:38,474 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [286539254] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:38,474 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [758086043] [2021-05-02 18:52:38,474 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:38,587 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 18:52:38,587 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:38,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 18:52:38,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:38,676 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:38,684 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:38,684 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [758086043] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:38,684 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:38,684 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 18:52:38,685 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626947672] [2021-05-02 18:52:38,685 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 18:52:38,685 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:38,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 18:52:38,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:52:38,685 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:38,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:38,922 INFO L93 Difference]: Finished difference Result 42 states and 49 transitions. [2021-05-02 18:52:38,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 18:52:38,922 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-05-02 18:52:38,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:38,922 INFO L225 Difference]: With dead ends: 42 [2021-05-02 18:52:38,923 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 18:52:38,923 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 23 SyntacticMatches, 5 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 196.1ms TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2021-05-02 18:52:38,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 18:52:38,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 34. [2021-05-02 18:52:38,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 28 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:38,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2021-05-02 18:52:38,925 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 25 [2021-05-02 18:52:38,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:38,925 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2021-05-02 18:52:38,925 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:38,925 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2021-05-02 18:52:38,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 18:52:38,926 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:38,926 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:39,141 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 18:52:39,141 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:39,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:39,141 INFO L82 PathProgramCache]: Analyzing trace with hash -1294995873, now seen corresponding path program 6 times [2021-05-02 18:52:39,141 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:39,141 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1441834194] [2021-05-02 18:52:39,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:39,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:39,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:39,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:39,246 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:39,246 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:39,247 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1441834194] [2021-05-02 18:52:39,247 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1441834194] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:39,247 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [238753547] [2021-05-02 18:52:39,247 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:39,317 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 18:52:39,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:39,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 18:52:39,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:39,382 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:39,382 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [238753547] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:39,382 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:39,383 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 18:52:39,383 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220625472] [2021-05-02 18:52:39,383 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 18:52:39,383 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:39,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 18:52:39,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 18:52:39,383 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 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 18:52:39,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:39,658 INFO L93 Difference]: Finished difference Result 44 states and 51 transitions. [2021-05-02 18:52:39,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 18:52:39,658 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 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 27 [2021-05-02 18:52:39,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:39,659 INFO L225 Difference]: With dead ends: 44 [2021-05-02 18:52:39,659 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 18:52:39,659 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 27 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 232.2ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-02 18:52:39,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 18:52:39,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 36. [2021-05-02 18:52:39,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 30 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:39,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2021-05-02 18:52:39,661 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 27 [2021-05-02 18:52:39,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:39,661 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2021-05-02 18:52:39,661 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 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 18:52:39,661 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2021-05-02 18:52:39,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 18:52:39,662 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:39,662 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:39,865 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:39,865 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:39,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:39,865 INFO L82 PathProgramCache]: Analyzing trace with hash 1960878909, now seen corresponding path program 7 times [2021-05-02 18:52:39,866 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:39,866 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1422826155] [2021-05-02 18:52:39,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:39,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:39,954 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:39,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:39,958 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:39,958 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:39,958 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1422826155] [2021-05-02 18:52:39,958 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1422826155] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:39,958 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2095960805] [2021-05-02 18:52:39,958 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:40,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:40,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 18:52:40,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:40,101 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:40,108 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:40,108 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2095960805] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:40,108 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:40,108 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 18:52:40,108 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785826949] [2021-05-02 18:52:40,109 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 18:52:40,109 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:40,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 18:52:40,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:52:40,109 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 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 18:52:40,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:40,409 INFO L93 Difference]: Finished difference Result 46 states and 53 transitions. [2021-05-02 18:52:40,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 18:52:40,409 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 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 29 [2021-05-02 18:52:40,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:40,410 INFO L225 Difference]: With dead ends: 46 [2021-05-02 18:52:40,410 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 18:52:40,410 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 256.6ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:52:40,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 18:52:40,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 38. [2021-05-02 18:52:40,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 32 states have (on average 1.15625) internal successors, (37), 32 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:40,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2021-05-02 18:52:40,412 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 29 [2021-05-02 18:52:40,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:40,412 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2021-05-02 18:52:40,412 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 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 18:52:40,412 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2021-05-02 18:52:40,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 18:52:40,413 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:40,413 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:40,628 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:40,629 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:40,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:40,629 INFO L82 PathProgramCache]: Analyzing trace with hash -174614373, now seen corresponding path program 8 times [2021-05-02 18:52:40,629 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:40,629 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1360363096] [2021-05-02 18:52:40,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:40,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:40,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:40,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:40,734 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:40,734 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:40,735 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1360363096] [2021-05-02 18:52:40,735 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1360363096] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:40,735 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2110030865] [2021-05-02 18:52:40,735 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:40,795 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:52:40,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:40,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 18:52:40,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:40,850 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:40,856 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:40,856 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2110030865] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:40,856 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:40,856 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 18:52:40,856 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556450223] [2021-05-02 18:52:40,857 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 18:52:40,857 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:40,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 18:52:40,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-02 18:52:40,857 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:41,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:41,224 INFO L93 Difference]: Finished difference Result 48 states and 55 transitions. [2021-05-02 18:52:41,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 18:52:41,224 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-02 18:52:41,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:41,226 INFO L225 Difference]: With dead ends: 48 [2021-05-02 18:52:41,226 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 18:52:41,226 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 279.8ms TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-02 18:52:41,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 18:52:41,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 40. [2021-05-02 18:52:41,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 34 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:41,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2021-05-02 18:52:41,233 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 31 [2021-05-02 18:52:41,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:41,233 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2021-05-02 18:52:41,233 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:41,233 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2021-05-02 18:52:41,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 18:52:41,235 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:41,235 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:41,448 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 18:52:41,449 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:41,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:41,449 INFO L82 PathProgramCache]: Analyzing trace with hash 610709113, now seen corresponding path program 9 times [2021-05-02 18:52:41,449 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:41,449 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1428685457] [2021-05-02 18:52:41,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:41,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:41,579 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:41,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:41,584 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:41,584 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:41,584 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1428685457] [2021-05-02 18:52:41,584 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1428685457] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:41,584 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [138292594] [2021-05-02 18:52:41,584 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:41,698 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-02 18:52:41,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:41,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 18:52:41,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:41,776 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:41,776 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [138292594] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:41,776 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:41,777 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 18:52:41,777 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382225824] [2021-05-02 18:52:41,777 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 18:52:41,777 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:41,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 18:52:41,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:52:41,778 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 13 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:42,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:42,186 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2021-05-02 18:52:42,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 18:52:42,187 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 13 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-05-02 18:52:42,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:42,187 INFO L225 Difference]: With dead ends: 50 [2021-05-02 18:52:42,187 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 18:52:42,188 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 33 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 351.4ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-02 18:52:42,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 18:52:42,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 42. [2021-05-02 18:52:42,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 36 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:42,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 46 transitions. [2021-05-02 18:52:42,190 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 46 transitions. Word has length 33 [2021-05-02 18:52:42,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:42,190 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 46 transitions. [2021-05-02 18:52:42,190 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 13 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:42,190 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 46 transitions. [2021-05-02 18:52:42,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 18:52:42,190 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:42,190 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:42,393 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:42,393 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:42,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:42,394 INFO L82 PathProgramCache]: Analyzing trace with hash -607664937, now seen corresponding path program 10 times [2021-05-02 18:52:42,394 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:42,394 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1499997257] [2021-05-02 18:52:42,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:42,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:42,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:42,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:42,532 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:42,532 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:42,532 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1499997257] [2021-05-02 18:52:42,532 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1499997257] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:42,532 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [503194647] [2021-05-02 18:52:42,532 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:42,581 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:52:42,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:42,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 18:52:42,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:42,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:42,654 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:42,654 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [503194647] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:42,654 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:42,655 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-02 18:52:42,655 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113938828] [2021-05-02 18:52:42,655 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 18:52:42,655 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:42,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 18:52:42,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-02 18:52:42,656 INFO L87 Difference]: Start difference. First operand 42 states and 46 transitions. Second operand has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 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 18:52:43,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:43,097 INFO L93 Difference]: Finished difference Result 52 states and 59 transitions. [2021-05-02 18:52:43,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 18:52:43,098 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 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 35 [2021-05-02 18:52:43,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:43,098 INFO L225 Difference]: With dead ends: 52 [2021-05-02 18:52:43,098 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 18:52:43,099 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 357.8ms TimeCoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2021-05-02 18:52:43,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 18:52:43,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 44. [2021-05-02 18:52:43,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 38 states have (on average 1.131578947368421) internal successors, (43), 38 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:43,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2021-05-02 18:52:43,101 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 35 [2021-05-02 18:52:43,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:43,101 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2021-05-02 18:52:43,101 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 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 18:52:43,101 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2021-05-02 18:52:43,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 18:52:43,101 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:43,101 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:43,319 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:43,320 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:43,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:43,320 INFO L82 PathProgramCache]: Analyzing trace with hash 1060944821, now seen corresponding path program 11 times [2021-05-02 18:52:43,320 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:43,320 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1928426496] [2021-05-02 18:52:43,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:43,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:43,473 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:43,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:43,480 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:43,480 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:43,480 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1928426496] [2021-05-02 18:52:43,480 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1928426496] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:43,480 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1454256972] [2021-05-02 18:52:43,480 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:43,656 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-05-02 18:52:43,656 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:43,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 18:52:43,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:43,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:43,772 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:43,772 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1454256972] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:43,773 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:43,773 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 18:52:43,773 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828914003] [2021-05-02 18:52:43,773 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 18:52:43,773 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:43,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 18:52:43,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 18:52:43,774 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:44,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:44,280 INFO L93 Difference]: Finished difference Result 54 states and 61 transitions. [2021-05-02 18:52:44,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 18:52:44,280 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2021-05-02 18:52:44,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:44,281 INFO L225 Difference]: With dead ends: 54 [2021-05-02 18:52:44,281 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 18:52:44,281 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 34 SyntacticMatches, 6 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 433.6ms TimeCoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2021-05-02 18:52:44,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 18:52:44,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 46. [2021-05-02 18:52:44,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 40 states have (on average 1.125) internal successors, (45), 40 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:44,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2021-05-02 18:52:44,283 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 37 [2021-05-02 18:52:44,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:44,283 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2021-05-02 18:52:44,283 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:44,284 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2021-05-02 18:52:44,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 18:52:44,284 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:44,284 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:44,500 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 18:52:44,500 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:44,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:44,500 INFO L82 PathProgramCache]: Analyzing trace with hash -1722846445, now seen corresponding path program 12 times [2021-05-02 18:52:44,500 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:44,500 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1945194580] [2021-05-02 18:52:44,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:44,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:44,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:44,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:44,672 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:44,672 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:44,672 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1945194580] [2021-05-02 18:52:44,673 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1945194580] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:44,673 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1900326152] [2021-05-02 18:52:44,673 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:44,850 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-02 18:52:44,851 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:44,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 18:52:44,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:44,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:44,984 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:44,985 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1900326152] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:44,985 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:44,985 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 18:52:44,985 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359152089] [2021-05-02 18:52:44,985 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 18:52:44,985 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:44,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 18:52:44,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 18:52:44,986 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 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 18:52:45,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:45,568 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2021-05-02 18:52:45,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 18:52:45,568 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 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 39 [2021-05-02 18:52:45,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:45,568 INFO L225 Difference]: With dead ends: 56 [2021-05-02 18:52:45,568 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 18:52:45,569 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 35 SyntacticMatches, 7 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 513.0ms TimeCoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2021-05-02 18:52:45,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 18:52:45,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 48. [2021-05-02 18:52:45,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 42 states have (on average 1.119047619047619) internal successors, (47), 42 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:45,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2021-05-02 18:52:45,571 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 39 [2021-05-02 18:52:45,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:45,571 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2021-05-02 18:52:45,571 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 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 18:52:45,571 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2021-05-02 18:52:45,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 18:52:45,571 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:45,571 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:45,774 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 18:52:45,774 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:45,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:45,775 INFO L82 PathProgramCache]: Analyzing trace with hash -1181627663, now seen corresponding path program 13 times [2021-05-02 18:52:45,775 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:45,775 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [495144340] [2021-05-02 18:52:45,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:45,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:45,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:45,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:45,959 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:45,959 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:45,959 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [495144340] [2021-05-02 18:52:45,959 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [495144340] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:45,959 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2085322170] [2021-05-02 18:52:45,959 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:46,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:46,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 18:52:46,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:46,071 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:46,076 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:46,076 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2085322170] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:46,076 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:46,076 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 18:52:46,076 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845147600] [2021-05-02 18:52:46,076 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 18:52:46,076 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:46,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 18:52:46,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 18:52:46,077 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 17 states have internal predecessors, (40), 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 18:52:46,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:46,699 INFO L93 Difference]: Finished difference Result 58 states and 65 transitions. [2021-05-02 18:52:46,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 18:52:46,700 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 17 states have internal predecessors, (40), 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 18:52:46,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:46,700 INFO L225 Difference]: With dead ends: 58 [2021-05-02 18:52:46,700 INFO L226 Difference]: Without dead ends: 58 [2021-05-02 18:52:46,701 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 491.4ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-02 18:52:46,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-02 18:52:46,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 50. [2021-05-02 18:52:46,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 44 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:46,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2021-05-02 18:52:46,703 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 41 [2021-05-02 18:52:46,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:46,703 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2021-05-02 18:52:46,703 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 17 states have internal predecessors, (40), 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 18:52:46,703 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2021-05-02 18:52:46,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 18:52:46,703 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:46,703 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:46,919 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 18:52:46,919 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:46,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:46,919 INFO L82 PathProgramCache]: Analyzing trace with hash -761420977, now seen corresponding path program 14 times [2021-05-02 18:52:46,919 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:46,919 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1702082267] [2021-05-02 18:52:46,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:46,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:47,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:47,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:47,107 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:47,107 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:47,108 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1702082267] [2021-05-02 18:52:47,108 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1702082267] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:47,108 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [717420127] [2021-05-02 18:52:47,108 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:47,143 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:52:47,144 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:47,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 18:52:47,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:47,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:47,229 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:47,229 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [717420127] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:47,229 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:47,229 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 18:52:47,229 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [993661365] [2021-05-02 18:52:47,229 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 18:52:47,229 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:47,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 18:52:47,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-02 18:52:47,230 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 18 states have internal predecessors, (42), 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 18:52:47,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:47,932 INFO L93 Difference]: Finished difference Result 60 states and 67 transitions. [2021-05-02 18:52:47,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 18:52:47,932 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 18 states have internal predecessors, (42), 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 43 [2021-05-02 18:52:47,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:47,933 INFO L225 Difference]: With dead ends: 60 [2021-05-02 18:52:47,933 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 18:52:47,933 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 534.8ms TimeCoverageRelationStatistics Valid=125, Invalid=997, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 18:52:47,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 18:52:47,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 52. [2021-05-02 18:52:47,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 46 states have (on average 1.108695652173913) internal successors, (51), 46 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:47,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2021-05-02 18:52:47,935 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 43 [2021-05-02 18:52:47,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:47,935 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2021-05-02 18:52:47,935 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 18 states have internal predecessors, (42), 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 18:52:47,935 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2021-05-02 18:52:47,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 18:52:47,936 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:47,936 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:48,152 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:48,152 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:48,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:48,152 INFO L82 PathProgramCache]: Analyzing trace with hash -669721555, now seen corresponding path program 15 times [2021-05-02 18:52:48,152 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:48,152 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1710088089] [2021-05-02 18:52:48,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:48,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:48,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:48,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:48,377 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:48,377 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:48,377 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1710088089] [2021-05-02 18:52:48,377 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1710088089] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:48,377 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [950591543] [2021-05-02 18:52:48,377 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:48,561 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-05-02 18:52:48,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:48,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 18:52:48,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:48,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:48,650 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:48,650 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [950591543] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:48,650 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:48,650 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 18:52:48,650 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313167274] [2021-05-02 18:52:48,651 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 18:52:48,651 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:48,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 18:52:48,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:52:48,651 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand has 20 states, 20 states have (on average 2.2) internal successors, (44), 19 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:49,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:49,300 INFO L93 Difference]: Finished difference Result 62 states and 69 transitions. [2021-05-02 18:52:49,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 18:52:49,301 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.2) internal successors, (44), 19 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2021-05-02 18:52:49,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:49,302 INFO L225 Difference]: With dead ends: 62 [2021-05-02 18:52:49,302 INFO L226 Difference]: Without dead ends: 62 [2021-05-02 18:52:49,302 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 568.8ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 18:52:49,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-02 18:52:49,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 54. [2021-05-02 18:52:49,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 48 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:49,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 58 transitions. [2021-05-02 18:52:49,304 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 58 transitions. Word has length 45 [2021-05-02 18:52:49,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:49,304 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 58 transitions. [2021-05-02 18:52:49,304 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.2) internal successors, (44), 19 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:49,304 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 58 transitions. [2021-05-02 18:52:49,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 18:52:49,305 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:49,305 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:49,507 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 18:52:49,508 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:49,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:49,508 INFO L82 PathProgramCache]: Analyzing trace with hash 1554077067, now seen corresponding path program 16 times [2021-05-02 18:52:49,508 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:49,508 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [843260247] [2021-05-02 18:52:49,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:49,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:49,715 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:49,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:49,722 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:49,723 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:49,723 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [843260247] [2021-05-02 18:52:49,723 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [843260247] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:49,723 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [108233043] [2021-05-02 18:52:49,723 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:49,767 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:52:49,767 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:49,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 18:52:49,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:49,849 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:49,855 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:49,855 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [108233043] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:49,855 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:49,855 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-02 18:52:49,855 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [75524923] [2021-05-02 18:52:49,856 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 18:52:49,856 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:49,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 18:52:49,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-05-02 18:52:49,856 INFO L87 Difference]: Start difference. First operand 54 states and 58 transitions. Second operand has 21 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 20 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 18:52:50,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:50,598 INFO L93 Difference]: Finished difference Result 64 states and 71 transitions. [2021-05-02 18:52:50,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 18:52:50,598 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 20 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 18:52:50,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:50,599 INFO L225 Difference]: With dead ends: 64 [2021-05-02 18:52:50,599 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 18:52:50,599 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 611.9ms TimeCoverageRelationStatistics Valid=141, Invalid=1265, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 18:52:50,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 18:52:50,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 56. [2021-05-02 18:52:50,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 50 states have (on average 1.1) internal successors, (55), 50 states have internal predecessors, (55), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:50,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2021-05-02 18:52:50,601 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 47 [2021-05-02 18:52:50,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:50,601 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2021-05-02 18:52:50,601 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 20 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 18:52:50,601 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2021-05-02 18:52:50,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 18:52:50,601 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:50,601 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:50,816 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 18:52:50,816 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:50,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:50,817 INFO L82 PathProgramCache]: Analyzing trace with hash -269160599, now seen corresponding path program 17 times [2021-05-02 18:52:50,817 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:50,817 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [427226382] [2021-05-02 18:52:50,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:50,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:51,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:51,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:51,062 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:51,062 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:51,062 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [427226382] [2021-05-02 18:52:51,062 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [427226382] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:51,062 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1138279850] [2021-05-02 18:52:51,062 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:51,356 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2021-05-02 18:52:51,356 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:51,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-02 18:52:51,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:51,517 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:51,521 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:51,521 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1138279850] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:51,521 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:51,521 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-02 18:52:51,521 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217648659] [2021-05-02 18:52:51,522 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 18:52:51,522 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:51,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 18:52:51,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-05-02 18:52:51,523 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:52,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:52,269 INFO L93 Difference]: Finished difference Result 66 states and 73 transitions. [2021-05-02 18:52:52,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 18:52:52,269 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2021-05-02 18:52:52,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:52,270 INFO L225 Difference]: With dead ends: 66 [2021-05-02 18:52:52,270 INFO L226 Difference]: Without dead ends: 66 [2021-05-02 18:52:52,270 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 42 SyntacticMatches, 10 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 708.8ms TimeCoverageRelationStatistics Valid=149, Invalid=1411, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 18:52:52,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-02 18:52:52,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 58. [2021-05-02 18:52:52,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 52 states have (on average 1.0961538461538463) internal successors, (57), 52 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:52,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 62 transitions. [2021-05-02 18:52:52,271 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 62 transitions. Word has length 49 [2021-05-02 18:52:52,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:52,272 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 62 transitions. [2021-05-02 18:52:52,272 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:52,272 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 62 transitions. [2021-05-02 18:52:52,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 18:52:52,272 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:52,272 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:52,473 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:52,473 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:52,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:52,473 INFO L82 PathProgramCache]: Analyzing trace with hash -53900857, now seen corresponding path program 18 times [2021-05-02 18:52:52,473 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:52,473 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2064313499] [2021-05-02 18:52:52,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:52,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:52,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:52,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:52,751 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:52,751 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:52,751 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2064313499] [2021-05-02 18:52:52,751 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2064313499] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:52,751 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1429409692] [2021-05-02 18:52:52,751 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 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 18:52:53,211 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-05-02 18:52:53,211 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:53,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 18:52:53,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:53,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:53,300 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:53,300 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1429409692] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:53,300 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:53,300 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 18:52:53,300 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2131156274] [2021-05-02 18:52:53,300 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 18:52:53,300 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:53,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 18:52:53,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 18:52:53,301 INFO L87 Difference]: Start difference. First operand 58 states and 62 transitions. Second operand has 23 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 22 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:54,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:54,282 INFO L93 Difference]: Finished difference Result 68 states and 75 transitions. [2021-05-02 18:52:54,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 18:52:54,282 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 22 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-02 18:52:54,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:54,283 INFO L225 Difference]: With dead ends: 68 [2021-05-02 18:52:54,283 INFO L226 Difference]: Without dead ends: 68 [2021-05-02 18:52:54,283 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 780.3ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 18:52:54,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-02 18:52:54,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 60. [2021-05-02 18:52:54,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 54 states have (on average 1.0925925925925926) internal successors, (59), 54 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:54,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2021-05-02 18:52:54,284 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 51 [2021-05-02 18:52:54,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:54,285 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2021-05-02 18:52:54,285 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 22 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:54,285 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2021-05-02 18:52:54,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 18:52:54,285 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:54,285 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:54,486 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:54,486 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:54,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:54,487 INFO L82 PathProgramCache]: Analyzing trace with hash 652280997, now seen corresponding path program 19 times [2021-05-02 18:52:54,487 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:54,487 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1863655012] [2021-05-02 18:52:54,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:54,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:54,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:54,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:54,821 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:54,821 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:54,821 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1863655012] [2021-05-02 18:52:54,821 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1863655012] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:54,821 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [64573910] [2021-05-02 18:52:54,821 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 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 18:52:54,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:54,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 18:52:54,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:54,944 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:54,949 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:54,949 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [64573910] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:54,949 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:54,949 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-02 18:52:54,949 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985610266] [2021-05-02 18:52:54,949 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 18:52:54,949 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:54,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 18:52:54,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-02 18:52:54,950 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand has 24 states, 24 states have (on average 2.1666666666666665) internal successors, (52), 23 states have internal predecessors, (52), 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 18:52:55,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:55,983 INFO L93 Difference]: Finished difference Result 70 states and 77 transitions. [2021-05-02 18:52:55,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 18:52:55,984 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.1666666666666665) internal successors, (52), 23 states have internal predecessors, (52), 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 53 [2021-05-02 18:52:55,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:55,984 INFO L225 Difference]: With dead ends: 70 [2021-05-02 18:52:55,984 INFO L226 Difference]: Without dead ends: 70 [2021-05-02 18:52:55,985 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 855.9ms TimeCoverageRelationStatistics Valid=165, Invalid=1727, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 18:52:55,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-05-02 18:52:55,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 62. [2021-05-02 18:52:55,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 56 states have (on average 1.0892857142857142) internal successors, (61), 56 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:55,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 66 transitions. [2021-05-02 18:52:55,986 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 66 transitions. Word has length 53 [2021-05-02 18:52:55,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:55,986 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 66 transitions. [2021-05-02 18:52:55,987 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.1666666666666665) internal successors, (52), 23 states have internal predecessors, (52), 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 18:52:55,987 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 66 transitions. [2021-05-02 18:52:55,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 18:52:55,987 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:55,987 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:56,202 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:56,202 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:56,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:56,203 INFO L82 PathProgramCache]: Analyzing trace with hash 688209923, now seen corresponding path program 20 times [2021-05-02 18:52:56,203 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:56,203 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1709981102] [2021-05-02 18:52:56,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:56,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:56,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:56,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:56,529 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:56,529 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:56,529 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1709981102] [2021-05-02 18:52:56,529 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1709981102] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:56,529 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1032948309] [2021-05-02 18:52:56,529 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 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 18:52:56,571 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:52:56,571 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:56,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 18:52:56,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:56,665 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:56,669 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:56,670 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1032948309] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:56,670 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:56,670 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 18:52:56,670 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424266015] [2021-05-02 18:52:56,670 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 18:52:56,670 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:56,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 18:52:56,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-02 18:52:56,671 INFO L87 Difference]: Start difference. First operand 62 states and 66 transitions. Second operand has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 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 18:52:57,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:57,801 INFO L93 Difference]: Finished difference Result 72 states and 79 transitions. [2021-05-02 18:52:57,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 18:52:57,802 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 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 55 [2021-05-02 18:52:57,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:57,802 INFO L225 Difference]: With dead ends: 72 [2021-05-02 18:52:57,802 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 18:52:57,803 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 902.7ms TimeCoverageRelationStatistics Valid=173, Invalid=1897, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 18:52:57,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 18:52:57,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 64. [2021-05-02 18:52:57,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 58 states have (on average 1.0862068965517242) internal successors, (63), 58 states have internal predecessors, (63), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:57,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 68 transitions. [2021-05-02 18:52:57,804 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 68 transitions. Word has length 55 [2021-05-02 18:52:57,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:57,804 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 68 transitions. [2021-05-02 18:52:57,804 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 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 18:52:57,804 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 68 transitions. [2021-05-02 18:52:57,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 18:52:57,805 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:57,805 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:58,020 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 18:52:58,021 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:58,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:58,021 INFO L82 PathProgramCache]: Analyzing trace with hash 856169441, now seen corresponding path program 21 times [2021-05-02 18:52:58,021 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:58,021 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1867877149] [2021-05-02 18:52:58,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:58,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:58,356 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:58,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:58,359 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:58,359 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:58,359 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1867877149] [2021-05-02 18:52:58,359 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1867877149] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:58,359 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1529093376] [2021-05-02 18:52:58,359 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 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 18:52:58,573 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-05-02 18:52:58,574 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:58,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 54 conjunts are in the unsatisfiable core [2021-05-02 18:52:58,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:58,695 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:52:58,696 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1529093376] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:58,696 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:58,696 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-02 18:52:58,696 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290451335] [2021-05-02 18:52:58,696 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 18:52:58,696 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:58,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 18:52:58,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-02 18:52:58,697 INFO L87 Difference]: Start difference. First operand 64 states and 68 transitions. Second operand has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 25 states have internal predecessors, (56), 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 18:52:59,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:59,861 INFO L93 Difference]: Finished difference Result 74 states and 81 transitions. [2021-05-02 18:52:59,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 18:52:59,861 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 25 states have internal predecessors, (56), 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 57 [2021-05-02 18:52:59,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:59,862 INFO L225 Difference]: With dead ends: 74 [2021-05-02 18:52:59,862 INFO L226 Difference]: Without dead ends: 74 [2021-05-02 18:52:59,862 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 55 SyntacticMatches, 5 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 241 ImplicationChecksByTransitivity, 997.9ms TimeCoverageRelationStatistics Valid=181, Invalid=2075, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 18:52:59,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-02 18:52:59,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 66. [2021-05-02 18:52:59,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 60 states have (on average 1.0833333333333333) internal successors, (65), 60 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:52:59,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 70 transitions. [2021-05-02 18:52:59,864 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 70 transitions. Word has length 57 [2021-05-02 18:52:59,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:59,864 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 70 transitions. [2021-05-02 18:52:59,864 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 25 states have internal predecessors, (56), 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 18:52:59,864 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 70 transitions. [2021-05-02 18:52:59,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 18:52:59,864 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:59,864 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:00,067 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 18:53:00,067 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:00,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:00,068 INFO L82 PathProgramCache]: Analyzing trace with hash -943491009, now seen corresponding path program 22 times [2021-05-02 18:53:00,068 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:00,068 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1763004074] [2021-05-02 18:53:00,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:00,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:00,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:00,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:00,435 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:00,435 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:00,435 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1763004074] [2021-05-02 18:53:00,435 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1763004074] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:00,435 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [793880541] [2021-05-02 18:53:00,435 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 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 18:53:00,474 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:53:00,475 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:53:00,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 47 conjunts are in the unsatisfiable core [2021-05-02 18:53:00,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:00,566 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:00,571 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:00,571 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [793880541] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:00,571 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:00,571 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2021-05-02 18:53:00,571 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1162644064] [2021-05-02 18:53:00,571 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 18:53:00,571 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:00,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 18:53:00,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2021-05-02 18:53:00,572 INFO L87 Difference]: Start difference. First operand 66 states and 70 transitions. Second operand has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 26 states have internal predecessors, (58), 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 18:53:01,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:01,888 INFO L93 Difference]: Finished difference Result 76 states and 83 transitions. [2021-05-02 18:53:01,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 18:53:01,889 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 26 states have internal predecessors, (58), 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 18:53:01,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:01,889 INFO L225 Difference]: With dead ends: 76 [2021-05-02 18:53:01,889 INFO L226 Difference]: Without dead ends: 76 [2021-05-02 18:53:01,890 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 257 ImplicationChecksByTransitivity, 1038.7ms TimeCoverageRelationStatistics Valid=189, Invalid=2261, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 18:53:01,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-02 18:53:01,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 68. [2021-05-02 18:53:01,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 62 states have (on average 1.0806451612903225) internal successors, (67), 62 states have internal predecessors, (67), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:53:01,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 72 transitions. [2021-05-02 18:53:01,891 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 72 transitions. Word has length 59 [2021-05-02 18:53:01,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:01,891 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 72 transitions. [2021-05-02 18:53:01,891 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 26 states have internal predecessors, (58), 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 18:53:01,891 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 72 transitions. [2021-05-02 18:53:01,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 18:53:01,892 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:01,892 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:02,106 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:02,107 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:02,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:02,107 INFO L82 PathProgramCache]: Analyzing trace with hash 454636829, now seen corresponding path program 23 times [2021-05-02 18:53:02,107 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:02,107 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [927907220] [2021-05-02 18:53:02,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:02,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:02,495 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:02,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:02,498 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:02,498 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:02,498 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [927907220] [2021-05-02 18:53:02,498 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [927907220] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:02,498 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1443765801] [2021-05-02 18:53:02,498 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 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 18:53:04,083 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2021-05-02 18:53:04,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:53:04,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-02 18:53:04,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:04,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:04,462 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:04,462 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1443765801] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:04,462 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:04,462 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-02 18:53:04,462 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262654030] [2021-05-02 18:53:04,462 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 18:53:04,462 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:04,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 18:53:04,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-02 18:53:04,463 INFO L87 Difference]: Start difference. First operand 68 states and 72 transitions. Second operand has 28 states, 28 states have (on average 2.142857142857143) internal successors, (60), 27 states have internal predecessors, (60), 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 18:53:05,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:05,898 INFO L93 Difference]: Finished difference Result 78 states and 85 transitions. [2021-05-02 18:53:05,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 18:53:05,898 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.142857142857143) internal successors, (60), 27 states have internal predecessors, (60), 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 61 [2021-05-02 18:53:05,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:05,899 INFO L225 Difference]: With dead ends: 78 [2021-05-02 18:53:05,899 INFO L226 Difference]: Without dead ends: 78 [2021-05-02 18:53:05,899 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 42 SyntacticMatches, 22 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 322 ImplicationChecksByTransitivity, 1373.0ms TimeCoverageRelationStatistics Valid=197, Invalid=2455, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 18:53:05,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-02 18:53:05,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 70. [2021-05-02 18:53:05,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 64 states have (on average 1.078125) internal successors, (69), 64 states have internal predecessors, (69), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:53:05,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 74 transitions. [2021-05-02 18:53:05,900 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 74 transitions. Word has length 61 [2021-05-02 18:53:05,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:05,901 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 74 transitions. [2021-05-02 18:53:05,901 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 2.142857142857143) internal successors, (60), 27 states have internal predecessors, (60), 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 18:53:05,901 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 74 transitions. [2021-05-02 18:53:05,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 18:53:05,901 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:05,901 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:06,104 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 18:53:06,105 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:06,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:06,105 INFO L82 PathProgramCache]: Analyzing trace with hash -269274501, now seen corresponding path program 24 times [2021-05-02 18:53:06,105 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:06,105 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1621675815] [2021-05-02 18:53:06,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:06,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:06,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:06,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:06,526 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:06,526 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:06,526 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1621675815] [2021-05-02 18:53:06,526 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1621675815] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:06,526 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1952940631] [2021-05-02 18:53:06,526 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 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 18:53:08,011 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2021-05-02 18:53:08,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:53:08,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-02 18:53:08,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:08,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:08,347 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:08,347 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1952940631] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:08,347 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:08,347 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-02 18:53:08,347 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1318969183] [2021-05-02 18:53:08,347 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 18:53:08,347 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:08,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 18:53:08,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-02 18:53:08,348 INFO L87 Difference]: Start difference. First operand 70 states and 74 transitions. Second operand has 29 states, 29 states have (on average 2.1379310344827585) internal successors, (62), 28 states have internal predecessors, (62), 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 18:53:09,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:09,782 INFO L93 Difference]: Finished difference Result 80 states and 87 transitions. [2021-05-02 18:53:09,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 18:53:09,783 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.1379310344827585) internal successors, (62), 28 states have internal predecessors, (62), 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 63 [2021-05-02 18:53:09,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:09,783 INFO L225 Difference]: With dead ends: 80 [2021-05-02 18:53:09,783 INFO L226 Difference]: Without dead ends: 80 [2021-05-02 18:53:09,784 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 51 SyntacticMatches, 15 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 332 ImplicationChecksByTransitivity, 1409.8ms TimeCoverageRelationStatistics Valid=205, Invalid=2657, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 18:53:09,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-05-02 18:53:09,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 72. [2021-05-02 18:53:09,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 66 states have (on average 1.0757575757575757) internal successors, (71), 66 states have internal predecessors, (71), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:53:09,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 76 transitions. [2021-05-02 18:53:09,786 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 76 transitions. Word has length 63 [2021-05-02 18:53:09,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:09,786 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 76 transitions. [2021-05-02 18:53:09,786 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.1379310344827585) internal successors, (62), 28 states have internal predecessors, (62), 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 18:53:09,786 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 76 transitions. [2021-05-02 18:53:09,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-02 18:53:09,786 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:09,786 INFO L523 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:09,989 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:09,990 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:09,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:09,990 INFO L82 PathProgramCache]: Analyzing trace with hash -163360679, now seen corresponding path program 25 times [2021-05-02 18:53:09,990 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:09,990 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1638635165] [2021-05-02 18:53:09,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:09,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:10,439 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:10,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:10,443 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:10,443 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:10,443 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1638635165] [2021-05-02 18:53:10,443 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1638635165] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:10,443 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [27428417] [2021-05-02 18:53:10,443 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 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 18:53:10,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:10,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 18:53:10,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:10,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:10,590 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:10,590 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [27428417] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:10,590 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:10,590 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 18:53:10,590 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903190141] [2021-05-02 18:53:10,590 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 18:53:10,590 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:10,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 18:53:10,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-02 18:53:10,591 INFO L87 Difference]: Start difference. First operand 72 states and 76 transitions. Second operand has 30 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 29 states have internal predecessors, (64), 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 18:53:12,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:12,030 INFO L93 Difference]: Finished difference Result 82 states and 89 transitions. [2021-05-02 18:53:12,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 18:53:12,031 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 29 states have internal predecessors, (64), 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 65 [2021-05-02 18:53:12,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:12,031 INFO L225 Difference]: With dead ends: 82 [2021-05-02 18:53:12,031 INFO L226 Difference]: Without dead ends: 82 [2021-05-02 18:53:12,032 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 329 ImplicationChecksByTransitivity, 1178.8ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 18:53:12,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-02 18:53:12,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 74. [2021-05-02 18:53:12,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 68 states have (on average 1.0735294117647058) internal successors, (73), 68 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:53:12,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 78 transitions. [2021-05-02 18:53:12,044 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 78 transitions. Word has length 65 [2021-05-02 18:53:12,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:12,045 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 78 transitions. [2021-05-02 18:53:12,045 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 29 states have internal predecessors, (64), 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 18:53:12,045 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 78 transitions. [2021-05-02 18:53:12,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-02 18:53:12,049 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:12,049 INFO L523 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:12,263 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 18:53:12,264 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:12,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:12,264 INFO L82 PathProgramCache]: Analyzing trace with hash -1459392841, now seen corresponding path program 26 times [2021-05-02 18:53:12,264 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:12,264 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1356873504] [2021-05-02 18:53:12,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:12,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:12,771 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:12,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:12,774 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:12,774 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:12,774 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1356873504] [2021-05-02 18:53:12,774 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1356873504] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:12,774 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1963736456] [2021-05-02 18:53:12,774 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 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 18:53:12,824 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:53:12,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:53:12,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-02 18:53:12,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:12,928 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:12,933 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:12,933 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1963736456] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:12,933 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:12,933 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2021-05-02 18:53:12,933 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123537032] [2021-05-02 18:53:12,933 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 18:53:12,933 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:12,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 18:53:12,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2021-05-02 18:53:12,934 INFO L87 Difference]: Start difference. First operand 74 states and 78 transitions. Second operand has 31 states, 31 states have (on average 2.129032258064516) internal successors, (66), 30 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 18:53:14,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:14,639 INFO L93 Difference]: Finished difference Result 84 states and 91 transitions. [2021-05-02 18:53:14,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 18:53:14,640 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.129032258064516) internal successors, (66), 30 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 67 [2021-05-02 18:53:14,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:14,640 INFO L225 Difference]: With dead ends: 84 [2021-05-02 18:53:14,640 INFO L226 Difference]: Without dead ends: 84 [2021-05-02 18:53:14,641 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 1354.2ms TimeCoverageRelationStatistics Valid=221, Invalid=3085, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 18:53:14,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-02 18:53:14,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 76. [2021-05-02 18:53:14,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 70 states have (on average 1.0714285714285714) internal successors, (75), 70 states have internal predecessors, (75), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:53:14,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 80 transitions. [2021-05-02 18:53:14,642 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 80 transitions. Word has length 67 [2021-05-02 18:53:14,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:14,642 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 80 transitions. [2021-05-02 18:53:14,642 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.129032258064516) internal successors, (66), 30 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 18:53:14,642 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 80 transitions. [2021-05-02 18:53:14,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-02 18:53:14,643 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:14,643 INFO L523 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:14,858 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 18:53:14,858 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:14,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:14,858 INFO L82 PathProgramCache]: Analyzing trace with hash -1405784683, now seen corresponding path program 27 times [2021-05-02 18:53:14,858 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:14,858 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [7721012] [2021-05-02 18:53:14,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:14,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:15,368 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:15,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:15,371 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:15,371 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:15,371 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [7721012] [2021-05-02 18:53:15,371 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [7721012] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:15,371 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [350949024] [2021-05-02 18:53:15,371 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 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 18:53:15,822 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2021-05-02 18:53:15,822 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:53:15,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 68 conjunts are in the unsatisfiable core [2021-05-02 18:53:15,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:16,169 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:16,174 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:16,174 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [350949024] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:16,174 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:16,175 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-02 18:53:16,175 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2093466733] [2021-05-02 18:53:16,175 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 18:53:16,175 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:16,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 18:53:16,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-02 18:53:16,175 INFO L87 Difference]: Start difference. First operand 76 states and 80 transitions. Second operand has 32 states, 32 states have (on average 2.125) internal successors, (68), 31 states have internal predecessors, (68), 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 18:53:18,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:18,013 INFO L93 Difference]: Finished difference Result 86 states and 93 transitions. [2021-05-02 18:53:18,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 18:53:18,013 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.125) internal successors, (68), 31 states have internal predecessors, (68), 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 69 [2021-05-02 18:53:18,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:18,014 INFO L225 Difference]: With dead ends: 86 [2021-05-02 18:53:18,014 INFO L226 Difference]: Without dead ends: 86 [2021-05-02 18:53:18,014 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 60 SyntacticMatches, 12 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 404 ImplicationChecksByTransitivity, 1660.4ms TimeCoverageRelationStatistics Valid=229, Invalid=3311, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 18:53:18,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-02 18:53:18,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 78. [2021-05-02 18:53:18,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 72 states have (on average 1.0694444444444444) internal successors, (77), 72 states have internal predecessors, (77), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:53:18,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 82 transitions. [2021-05-02 18:53:18,016 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 82 transitions. Word has length 69 [2021-05-02 18:53:18,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:18,016 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 82 transitions. [2021-05-02 18:53:18,016 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.125) internal successors, (68), 31 states have internal predecessors, (68), 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 18:53:18,016 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 82 transitions. [2021-05-02 18:53:18,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 18:53:18,016 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:18,016 INFO L523 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:18,220 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 18:53:18,220 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:18,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:18,220 INFO L82 PathProgramCache]: Analyzing trace with hash -1427952397, now seen corresponding path program 28 times [2021-05-02 18:53:18,220 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:18,220 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [406777962] [2021-05-02 18:53:18,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:18,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:18,865 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:18,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:18,868 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:18,868 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:18,868 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [406777962] [2021-05-02 18:53:18,868 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [406777962] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:18,868 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [600810391] [2021-05-02 18:53:18,868 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 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 18:53:18,925 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:53:18,925 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:53:18,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 59 conjunts are in the unsatisfiable core [2021-05-02 18:53:18,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:19,037 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:19,042 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:19,042 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [600810391] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:19,042 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:19,042 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2021-05-02 18:53:19,042 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [300326178] [2021-05-02 18:53:19,043 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 18:53:19,043 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:19,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 18:53:19,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 18:53:19,043 INFO L87 Difference]: Start difference. First operand 78 states and 82 transitions. Second operand has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 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 18:53:20,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:20,780 INFO L93 Difference]: Finished difference Result 88 states and 95 transitions. [2021-05-02 18:53:20,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 18:53:20,781 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 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 71 [2021-05-02 18:53:20,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:20,781 INFO L225 Difference]: With dead ends: 88 [2021-05-02 18:53:20,781 INFO L226 Difference]: Without dead ends: 88 [2021-05-02 18:53:20,782 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 1536.0ms TimeCoverageRelationStatistics Valid=237, Invalid=3545, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 18:53:20,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-05-02 18:53:20,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 80. [2021-05-02 18:53:20,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 74 states have (on average 1.0675675675675675) internal successors, (79), 74 states have internal predecessors, (79), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:53:20,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 84 transitions. [2021-05-02 18:53:20,787 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 84 transitions. Word has length 71 [2021-05-02 18:53:20,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:20,788 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 84 transitions. [2021-05-02 18:53:20,788 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 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 18:53:20,788 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 84 transitions. [2021-05-02 18:53:20,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 18:53:20,788 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:20,788 INFO L523 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:21,003 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:21,003 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:21,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:21,004 INFO L82 PathProgramCache]: Analyzing trace with hash -1256289071, now seen corresponding path program 29 times [2021-05-02 18:53:21,004 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:21,004 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1014206111] [2021-05-02 18:53:21,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:21,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:21,418 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:21,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:21,439 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:21,439 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:21,439 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1014206111] [2021-05-02 18:53:21,439 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1014206111] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:21,439 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1705003060] [2021-05-02 18:53:21,439 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 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 18:53:29,137 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 30 check-sat command(s) [2021-05-02 18:53:29,137 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:53:29,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 82 conjunts are in the unsatisfiable core [2021-05-02 18:53:29,143 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:29,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:29,562 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:29,563 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1705003060] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:29,563 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:29,563 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2021-05-02 18:53:29,563 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [113025437] [2021-05-02 18:53:29,563 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 18:53:29,563 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:29,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 18:53:29,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 18:53:29,564 INFO L87 Difference]: Start difference. First operand 80 states and 84 transitions. Second operand has 34 states, 34 states have (on average 2.1176470588235294) internal successors, (72), 33 states have internal predecessors, (72), 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 18:53:31,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:31,498 INFO L93 Difference]: Finished difference Result 90 states and 97 transitions. [2021-05-02 18:53:31,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 18:53:31,498 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.1176470588235294) internal successors, (72), 33 states have internal predecessors, (72), 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 73 [2021-05-02 18:53:31,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:31,499 INFO L225 Difference]: With dead ends: 90 [2021-05-02 18:53:31,499 INFO L226 Difference]: Without dead ends: 90 [2021-05-02 18:53:31,500 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 54 SyntacticMatches, 22 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 481 ImplicationChecksByTransitivity, 1687.7ms TimeCoverageRelationStatistics Valid=245, Invalid=3787, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 18:53:31,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-02 18:53:31,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 82. [2021-05-02 18:53:31,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 76 states have (on average 1.0657894736842106) internal successors, (81), 76 states have internal predecessors, (81), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:53:31,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 86 transitions. [2021-05-02 18:53:31,506 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 86 transitions. Word has length 73 [2021-05-02 18:53:31,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:31,506 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 86 transitions. [2021-05-02 18:53:31,506 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.1176470588235294) internal successors, (72), 33 states have internal predecessors, (72), 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 18:53:31,506 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 86 transitions. [2021-05-02 18:53:31,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-02 18:53:31,507 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:31,518 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:31,722 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-02 18:53:31,723 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:31,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:31,723 INFO L82 PathProgramCache]: Analyzing trace with hash 503409967, now seen corresponding path program 30 times [2021-05-02 18:53:31,723 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:31,723 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1409789694] [2021-05-02 18:53:31,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:31,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:32,293 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:32,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:32,310 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:32,310 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:32,311 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1409789694] [2021-05-02 18:53:32,311 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1409789694] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:32,311 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [354713539] [2021-05-02 18:53:32,311 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 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 18:53:33,086 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2021-05-02 18:53:33,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:53:33,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 64 conjunts are in the unsatisfiable core [2021-05-02 18:53:33,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:33,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:33,229 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:33,229 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [354713539] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:33,229 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:33,229 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2021-05-02 18:53:33,229 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355912853] [2021-05-02 18:53:33,229 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 18:53:33,229 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:33,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 18:53:33,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 18:53:33,230 INFO L87 Difference]: Start difference. First operand 82 states and 86 transitions. Second operand has 35 states, 35 states have (on average 2.1142857142857143) internal successors, (74), 34 states have internal predecessors, (74), 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 18:53:35,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:35,078 INFO L93 Difference]: Finished difference Result 92 states and 99 transitions. [2021-05-02 18:53:35,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 18:53:35,078 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.1142857142857143) internal successors, (74), 34 states have internal predecessors, (74), 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 75 [2021-05-02 18:53:35,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:35,079 INFO L225 Difference]: With dead ends: 92 [2021-05-02 18:53:35,079 INFO L226 Difference]: Without dead ends: 92 [2021-05-02 18:53:35,080 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 471 ImplicationChecksByTransitivity, 1485.6ms TimeCoverageRelationStatistics Valid=253, Invalid=4037, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 18:53:35,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-02 18:53:35,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 84. [2021-05-02 18:53:35,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 78 states have (on average 1.064102564102564) internal successors, (83), 78 states have internal predecessors, (83), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:53:35,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 88 transitions. [2021-05-02 18:53:35,081 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 88 transitions. Word has length 75 [2021-05-02 18:53:35,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:35,081 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 88 transitions. [2021-05-02 18:53:35,081 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.1142857142857143) internal successors, (74), 34 states have internal predecessors, (74), 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 18:53:35,081 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 88 transitions. [2021-05-02 18:53:35,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-02 18:53:35,082 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:35,082 INFO L523 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:35,282 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:35,282 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:35,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:35,282 INFO L82 PathProgramCache]: Analyzing trace with hash -642929139, now seen corresponding path program 31 times [2021-05-02 18:53:35,283 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:35,283 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [161719164] [2021-05-02 18:53:35,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:35,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:35,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:36,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:36,029 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:36,029 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:36,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [161719164] [2021-05-02 18:53:36,029 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [161719164] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:36,030 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [142432400] [2021-05-02 18:53:36,030 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 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 18:53:36,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:36,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-02 18:53:36,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:36,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,257 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:36,257 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [142432400] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:36,257 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:36,257 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2021-05-02 18:53:36,257 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510598547] [2021-05-02 18:53:36,258 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 18:53:36,258 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:36,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 18:53:36,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 18:53:36,258 INFO L87 Difference]: Start difference. First operand 84 states and 88 transitions. Second operand has 36 states, 36 states have (on average 2.111111111111111) internal successors, (76), 35 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 18:53:38,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:38,002 INFO L93 Difference]: Finished difference Result 94 states and 101 transitions. [2021-05-02 18:53:38,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 18:53:38,002 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.111111111111111) internal successors, (76), 35 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 77 [2021-05-02 18:53:38,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:38,002 INFO L225 Difference]: With dead ends: 94 [2021-05-02 18:53:38,003 INFO L226 Difference]: Without dead ends: 94 [2021-05-02 18:53:38,004 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 500 ImplicationChecksByTransitivity, 1542.3ms TimeCoverageRelationStatistics Valid=261, Invalid=4295, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 18:53:38,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-02 18:53:38,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 86. [2021-05-02 18:53:38,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 80 states have (on average 1.0625) internal successors, (85), 80 states have internal predecessors, (85), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:53:38,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 90 transitions. [2021-05-02 18:53:38,007 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 90 transitions. Word has length 77 [2021-05-02 18:53:38,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:38,008 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 90 transitions. [2021-05-02 18:53:38,008 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 2.111111111111111) internal successors, (76), 35 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 18:53:38,008 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 90 transitions. [2021-05-02 18:53:38,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-02 18:53:38,008 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:38,008 INFO L523 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:38,223 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-02 18:53:38,224 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:38,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:38,224 INFO L82 PathProgramCache]: Analyzing trace with hash 1531785067, now seen corresponding path program 32 times [2021-05-02 18:53:38,224 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:38,224 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1145340265] [2021-05-02 18:53:38,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:38,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:38,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:38,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:38,792 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:38,792 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:38,792 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1145340265] [2021-05-02 18:53:38,793 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1145340265] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:38,793 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [659563101] [2021-05-02 18:53:38,793 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 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 [2021-05-02 18:53:38,859 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:53:38,859 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:53:38,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 67 conjunts are in the unsatisfiable core [2021-05-02 18:53:38,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:38,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:38,984 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:38,984 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [659563101] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:38,984 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:38,984 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2021-05-02 18:53:38,985 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593888391] [2021-05-02 18:53:38,985 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 18:53:38,985 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:38,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 18:53:38,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 18:53:38,986 INFO L87 Difference]: Start difference. First operand 86 states and 90 transitions. Second operand has 37 states, 37 states have (on average 2.108108108108108) internal successors, (78), 36 states have internal predecessors, (78), 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 18:53:41,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:41,045 INFO L93 Difference]: Finished difference Result 96 states and 103 transitions. [2021-05-02 18:53:41,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 18:53:41,046 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.108108108108108) internal successors, (78), 36 states have internal predecessors, (78), 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 79 [2021-05-02 18:53:41,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:41,046 INFO L225 Difference]: With dead ends: 96 [2021-05-02 18:53:41,046 INFO L226 Difference]: Without dead ends: 96 [2021-05-02 18:53:41,047 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 1580.8ms TimeCoverageRelationStatistics Valid=269, Invalid=4561, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 18:53:41,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-02 18:53:41,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 88. [2021-05-02 18:53:41,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 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), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:53:41,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 92 transitions. [2021-05-02 18:53:41,048 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 92 transitions. Word has length 79 [2021-05-02 18:53:41,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:41,048 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 92 transitions. [2021-05-02 18:53:41,048 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 2.108108108108108) internal successors, (78), 36 states have internal predecessors, (78), 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 18:53:41,048 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 92 transitions. [2021-05-02 18:53:41,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-02 18:53:41,049 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:41,049 INFO L523 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:41,249 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-02 18:53:41,249 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:41,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:41,249 INFO L82 PathProgramCache]: Analyzing trace with hash -216936119, now seen corresponding path program 33 times [2021-05-02 18:53:41,249 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:41,249 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [284432936] [2021-05-02 18:53:41,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:41,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:41,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:41,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:41,934 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:41,934 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:41,934 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [284432936] [2021-05-02 18:53:41,934 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [284432936] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:41,934 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [160469057] [2021-05-02 18:53:41,934 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:42,513 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2021-05-02 18:53:42,513 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:53:42,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 77 conjunts are in the unsatisfiable core [2021-05-02 18:53:42,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:42,846 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:42,851 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:42,851 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [160469057] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:42,851 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:42,851 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 38 [2021-05-02 18:53:42,851 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540993861] [2021-05-02 18:53:42,852 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 18:53:42,852 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:42,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 18:53:42,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 18:53:42,852 INFO L87 Difference]: Start difference. First operand 88 states and 92 transitions. Second operand has 38 states, 38 states have (on average 2.1052631578947367) internal successors, (80), 37 states have internal predecessors, (80), 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 18:53:45,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:45,202 INFO L93 Difference]: Finished difference Result 98 states and 105 transitions. [2021-05-02 18:53:45,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-02 18:53:45,203 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1052631578947367) internal successors, (80), 37 states have internal predecessors, (80), 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 81 [2021-05-02 18:53:45,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:45,203 INFO L225 Difference]: With dead ends: 98 [2021-05-02 18:53:45,203 INFO L226 Difference]: Without dead ends: 98 [2021-05-02 18:53:45,204 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 75 SyntacticMatches, 9 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 581 ImplicationChecksByTransitivity, 2020.4ms TimeCoverageRelationStatistics Valid=277, Invalid=4835, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 18:53:45,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-02 18:53:45,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 90. [2021-05-02 18:53:45,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 84 states have (on average 1.0595238095238095) internal successors, (89), 84 states have internal predecessors, (89), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:53:45,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 94 transitions. [2021-05-02 18:53:45,205 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 94 transitions. Word has length 81 [2021-05-02 18:53:45,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:45,205 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 94 transitions. [2021-05-02 18:53:45,205 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.1052631578947367) internal successors, (80), 37 states have internal predecessors, (80), 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 18:53:45,205 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 94 transitions. [2021-05-02 18:53:45,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 18:53:45,206 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:45,206 INFO L523 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:45,406 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 18:53:45,406 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:45,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:45,407 INFO L82 PathProgramCache]: Analyzing trace with hash -1405783129, now seen corresponding path program 34 times [2021-05-02 18:53:45,407 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:45,407 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [832957224] [2021-05-02 18:53:45,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:45,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:46,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:46,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:46,208 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:46,209 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:46,209 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [832957224] [2021-05-02 18:53:46,209 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [832957224] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:46,209 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47868409] [2021-05-02 18:53:46,209 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:46,253 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:53:46,253 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:53:46,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 71 conjunts are in the unsatisfiable core [2021-05-02 18:53:46,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:46,368 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:46,373 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:46,373 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [47868409] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:46,373 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:46,373 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37] total 39 [2021-05-02 18:53:46,373 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1288508836] [2021-05-02 18:53:46,374 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 18:53:46,374 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:46,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 18:53:46,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 18:53:46,374 INFO L87 Difference]: Start difference. First operand 90 states and 94 transitions. Second operand has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 38 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 18:53:48,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:48,378 INFO L93 Difference]: Finished difference Result 100 states and 107 transitions. [2021-05-02 18:53:48,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 18:53:48,379 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 38 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 83 [2021-05-02 18:53:48,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:48,379 INFO L225 Difference]: With dead ends: 100 [2021-05-02 18:53:48,379 INFO L226 Difference]: Without dead ends: 100 [2021-05-02 18:53:48,379 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 85 SyntacticMatches, 1 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 599 ImplicationChecksByTransitivity, 1788.2ms TimeCoverageRelationStatistics Valid=285, Invalid=5117, Unknown=0, NotChecked=0, Total=5402 [2021-05-02 18:53:48,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-05-02 18:53:48,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 92. [2021-05-02 18:53:48,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 86 states have (on average 1.058139534883721) internal successors, (91), 86 states have internal predecessors, (91), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:53:48,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 96 transitions. [2021-05-02 18:53:48,381 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 96 transitions. Word has length 83 [2021-05-02 18:53:48,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:48,381 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 96 transitions. [2021-05-02 18:53:48,381 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 38 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 18:53:48,381 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 96 transitions. [2021-05-02 18:53:48,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-02 18:53:48,382 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:48,382 INFO L523 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:48,596 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 18:53:48,597 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:48,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:48,597 INFO L82 PathProgramCache]: Analyzing trace with hash -1426459003, now seen corresponding path program 35 times [2021-05-02 18:53:48,597 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:48,597 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1374339638] [2021-05-02 18:53:48,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:48,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:49,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:49,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:49,364 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:49,364 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:49,364 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1374339638] [2021-05-02 18:53:49,364 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1374339638] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:49,364 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [803279348] [2021-05-02 18:53:49,364 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 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:54:26,101 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 36 check-sat command(s) [2021-05-02 18:54:26,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:54:26,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 103 conjunts are in the unsatisfiable core [2021-05-02 18:54:26,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:54:26,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:54:26,829 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:54:26,830 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [803279348] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:54:26,830 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:54:26,830 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38] total 40 [2021-05-02 18:54:26,830 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509098461] [2021-05-02 18:54:26,830 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-02 18:54:26,830 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:54:26,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-02 18:54:26,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 18:54:26,830 INFO L87 Difference]: Start difference. First operand 92 states and 96 transitions. Second operand has 40 states, 40 states have (on average 2.1) internal successors, (84), 39 states have internal predecessors, (84), 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 18:54:29,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:54:29,239 INFO L93 Difference]: Finished difference Result 102 states and 109 transitions. [2021-05-02 18:54:29,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-02 18:54:29,240 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.1) internal successors, (84), 39 states have internal predecessors, (84), 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 85 [2021-05-02 18:54:29,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:54:29,240 INFO L225 Difference]: With dead ends: 102 [2021-05-02 18:54:29,240 INFO L226 Difference]: Without dead ends: 102 [2021-05-02 18:54:29,241 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 57 SyntacticMatches, 31 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 694 ImplicationChecksByTransitivity, 2488.7ms TimeCoverageRelationStatistics Valid=293, Invalid=5407, Unknown=0, NotChecked=0, Total=5700 [2021-05-02 18:54:29,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-05-02 18:54:29,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 94. [2021-05-02 18:54:29,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 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), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:54:29,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 98 transitions. [2021-05-02 18:54:29,242 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 98 transitions. Word has length 85 [2021-05-02 18:54:29,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:54:29,242 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 98 transitions. [2021-05-02 18:54:29,242 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 2.1) internal successors, (84), 39 states have internal predecessors, (84), 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 18:54:29,242 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 98 transitions. [2021-05-02 18:54:29,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-05-02 18:54:29,242 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:54:29,243 INFO L523 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:54:29,443 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 18:54:29,443 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:54:29,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:54:29,443 INFO L82 PathProgramCache]: Analyzing trace with hash 178862563, now seen corresponding path program 36 times [2021-05-02 18:54:29,443 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:54:29,443 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1608188560] [2021-05-02 18:54:29,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:54:29,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:54:30,231 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:54:30,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:54:30,234 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:54:30,234 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:54:30,234 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1608188560] [2021-05-02 18:54:30,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1608188560] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:54:30,234 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1436040039] [2021-05-02 18:54:30,234 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 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:54:32,680 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 37 check-sat command(s) [2021-05-02 18:54:32,681 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:54:32,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 75 conjunts are in the unsatisfiable core [2021-05-02 18:54:32,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:54:32,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:54:32,825 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:54:32,825 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1436040039] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:54:32,825 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:54:32,825 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39] total 41 [2021-05-02 18:54:32,825 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [37717851] [2021-05-02 18:54:32,825 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 18:54:32,825 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:54:32,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 18:54:32,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 18:54:32,826 INFO L87 Difference]: Start difference. First operand 94 states and 98 transitions. Second operand has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 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 18:54:35,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:54:35,459 INFO L93 Difference]: Finished difference Result 104 states and 111 transitions. [2021-05-02 18:54:35,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 18:54:35,459 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 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 87 [2021-05-02 18:54:35,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:54:35,460 INFO L225 Difference]: With dead ends: 104 [2021-05-02 18:54:35,460 INFO L226 Difference]: Without dead ends: 104 [2021-05-02 18:54:35,460 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 89 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 670 ImplicationChecksByTransitivity, 2050.6ms TimeCoverageRelationStatistics Valid=301, Invalid=5705, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 18:54:35,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-05-02 18:54:35,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 96. [2021-05-02 18:54:35,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 90 states have (on average 1.0555555555555556) internal successors, (95), 90 states have internal predecessors, (95), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:54:35,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 100 transitions. [2021-05-02 18:54:35,462 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 100 transitions. Word has length 87 [2021-05-02 18:54:35,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:54:35,462 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 100 transitions. [2021-05-02 18:54:35,462 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 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 18:54:35,462 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 100 transitions. [2021-05-02 18:54:35,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-02 18:54:35,462 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:54:35,462 INFO L523 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:54:35,663 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-02 18:54:35,663 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:54:35,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:54:35,663 INFO L82 PathProgramCache]: Analyzing trace with hash 999628225, now seen corresponding path program 37 times [2021-05-02 18:54:35,663 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:54:35,664 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [351922448] [2021-05-02 18:54:35,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:54:35,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:54:36,480 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:54:36,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:54:36,483 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:54:36,483 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:54:36,483 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [351922448] [2021-05-02 18:54:36,483 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [351922448] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:54:36,483 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1374881309] [2021-05-02 18:54:36,483 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 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:54:36,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:54:36,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 77 conjunts are in the unsatisfiable core [2021-05-02 18:54:36,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:54:36,665 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:54:36,670 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:54:36,670 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1374881309] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:54:36,670 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:54:36,670 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40] total 42 [2021-05-02 18:54:36,670 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608815458] [2021-05-02 18:54:36,670 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 18:54:36,670 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:54:36,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 18:54:36,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1603, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 18:54:36,671 INFO L87 Difference]: Start difference. First operand 96 states and 100 transitions. Second operand has 42 states, 42 states have (on average 2.0952380952380953) internal successors, (88), 41 states have internal predecessors, (88), 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 18:54:39,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:54:39,428 INFO L93 Difference]: Finished difference Result 106 states and 113 transitions. [2021-05-02 18:54:39,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 18:54:39,428 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.0952380952380953) internal successors, (88), 41 states have internal predecessors, (88), 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 89 [2021-05-02 18:54:39,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:54:39,429 INFO L225 Difference]: With dead ends: 106 [2021-05-02 18:54:39,429 INFO L226 Difference]: Without dead ends: 106 [2021-05-02 18:54:39,429 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 91 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 707 ImplicationChecksByTransitivity, 2146.7ms TimeCoverageRelationStatistics Valid=309, Invalid=6011, Unknown=0, NotChecked=0, Total=6320 [2021-05-02 18:54:39,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-05-02 18:54:39,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 98. [2021-05-02 18:54:39,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 92 states have (on average 1.0543478260869565) internal successors, (97), 92 states have internal predecessors, (97), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:54:39,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 102 transitions. [2021-05-02 18:54:39,431 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 102 transitions. Word has length 89 [2021-05-02 18:54:39,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:54:39,431 INFO L480 AbstractCegarLoop]: Abstraction has 98 states and 102 transitions. [2021-05-02 18:54:39,431 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 2.0952380952380953) internal successors, (88), 41 states have internal predecessors, (88), 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 18:54:39,431 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 102 transitions. [2021-05-02 18:54:39,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-02 18:54:39,431 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:54:39,431 INFO L523 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:54:39,632 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-02 18:54:39,632 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:54:39,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:54:39,632 INFO L82 PathProgramCache]: Analyzing trace with hash -518553057, now seen corresponding path program 38 times [2021-05-02 18:54:39,632 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:54:39,632 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [364691373] [2021-05-02 18:54:39,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:54:39,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:54:40,314 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:54:40,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:54:40,317 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:54:40,317 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:54:40,317 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [364691373] [2021-05-02 18:54:40,317 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [364691373] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:54:40,317 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [50177060] [2021-05-02 18:54:40,318 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 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:54:40,364 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:54:40,364 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:54:40,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 79 conjunts are in the unsatisfiable core [2021-05-02 18:54:40,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:54:40,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:54:40,481 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:54:40,482 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [50177060] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:54:40,482 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:54:40,482 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41] total 43 [2021-05-02 18:54:40,482 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807942688] [2021-05-02 18:54:40,482 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 18:54:40,482 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:54:40,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 18:54:40,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1684, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 18:54:40,483 INFO L87 Difference]: Start difference. First operand 98 states and 102 transitions. Second operand has 43 states, 43 states have (on average 2.0930232558139537) internal successors, (90), 42 states have internal predecessors, (90), 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 18:54:42,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:54:42,470 INFO L93 Difference]: Finished difference Result 108 states and 115 transitions. [2021-05-02 18:54:42,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-02 18:54:42,470 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.0930232558139537) internal successors, (90), 42 states have internal predecessors, (90), 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 91 [2021-05-02 18:54:42,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:54:42,470 INFO L225 Difference]: With dead ends: 108 [2021-05-02 18:54:42,470 INFO L226 Difference]: Without dead ends: 108 [2021-05-02 18:54:42,471 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 93 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 745 ImplicationChecksByTransitivity, 1632.3ms TimeCoverageRelationStatistics Valid=317, Invalid=6325, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 18:54:42,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-05-02 18:54:42,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 100. [2021-05-02 18:54:42,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 94 states have (on average 1.053191489361702) internal successors, (99), 94 states have internal predecessors, (99), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:54:42,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 104 transitions. [2021-05-02 18:54:42,472 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 104 transitions. Word has length 91 [2021-05-02 18:54:42,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:54:42,472 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 104 transitions. [2021-05-02 18:54:42,472 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 2.0930232558139537) internal successors, (90), 42 states have internal predecessors, (90), 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 18:54:42,473 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 104 transitions. [2021-05-02 18:54:42,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-02 18:54:42,473 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:54:42,473 INFO L523 BasicCegarLoop]: trace histogram [39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:54:42,687 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-02 18:54:42,688 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:54:42,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:54:42,688 INFO L82 PathProgramCache]: Analyzing trace with hash 798115581, now seen corresponding path program 39 times [2021-05-02 18:54:42,688 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:54:42,688 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [459496591] [2021-05-02 18:54:42,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:54:42,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:54:43,436 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:54:43,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:54:43,449 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:54:43,449 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:54:43,449 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [459496591] [2021-05-02 18:54:43,449 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [459496591] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:54:43,449 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [432194152] [2021-05-02 18:54:43,449 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 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:54:43,991 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2021-05-02 18:54:43,991 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:54:43,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 90 conjunts are in the unsatisfiable core [2021-05-02 18:54:43,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:54:44,214 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:54:44,214 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [432194152] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:54:44,214 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:54:44,214 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42] total 44 [2021-05-02 18:54:44,214 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1025537217] [2021-05-02 18:54:44,215 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 18:54:44,215 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:54:44,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 18:54:44,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1767, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 18:54:44,215 INFO L87 Difference]: Start difference. First operand 100 states and 104 transitions. Second operand has 44 states, 44 states have (on average 2.090909090909091) internal successors, (92), 43 states have internal predecessors, (92), 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 18:54:47,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:54:47,077 INFO L93 Difference]: Finished difference Result 110 states and 117 transitions. [2021-05-02 18:54:47,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 18:54:47,077 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.090909090909091) internal successors, (92), 43 states have internal predecessors, (92), 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 93 [2021-05-02 18:54:47,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:54:47,078 INFO L225 Difference]: With dead ends: 110 [2021-05-02 18:54:47,078 INFO L226 Difference]: Without dead ends: 110 [2021-05-02 18:54:47,078 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 91 SyntacticMatches, 5 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 790 ImplicationChecksByTransitivity, 2210.9ms TimeCoverageRelationStatistics Valid=325, Invalid=6647, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 18:54:47,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-02 18:54:47,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 102. [2021-05-02 18:54:47,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 96 states have (on average 1.0520833333333333) internal successors, (101), 96 states have internal predecessors, (101), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:54:47,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 106 transitions. [2021-05-02 18:54:47,080 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 106 transitions. Word has length 93 [2021-05-02 18:54:47,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:54:47,081 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 106 transitions. [2021-05-02 18:54:47,081 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 2.090909090909091) internal successors, (92), 43 states have internal predecessors, (92), 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 18:54:47,081 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 106 transitions. [2021-05-02 18:54:47,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-02 18:54:47,081 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:54:47,081 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:54:47,284 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,40 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:54:47,285 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:54:47,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:54:47,285 INFO L82 PathProgramCache]: Analyzing trace with hash -898675621, now seen corresponding path program 40 times [2021-05-02 18:54:47,285 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:54:47,285 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [93750972] [2021-05-02 18:54:47,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:54:47,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:54:48,107 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:54:48,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:54:48,111 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:54:48,111 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:54:48,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [93750972] [2021-05-02 18:54:48,111 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [93750972] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:54:48,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1505775424] [2021-05-02 18:54:48,111 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 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:54:48,157 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:54:48,157 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:54:48,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 83 conjunts are in the unsatisfiable core [2021-05-02 18:54:48,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:54:48,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:54:48,298 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:54:48,298 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1505775424] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:54:48,299 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:54:48,299 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43] total 45 [2021-05-02 18:54:48,299 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [368510417] [2021-05-02 18:54:48,299 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 18:54:48,299 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:54:48,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 18:54:48,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1852, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 18:54:48,300 INFO L87 Difference]: Start difference. First operand 102 states and 106 transitions. Second operand has 45 states, 45 states have (on average 2.088888888888889) internal successors, (94), 44 states have internal predecessors, (94), 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 18:54:51,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:54:51,421 INFO L93 Difference]: Finished difference Result 112 states and 119 transitions. [2021-05-02 18:54:51,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 18:54:51,421 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.088888888888889) internal successors, (94), 44 states have internal predecessors, (94), 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 95 [2021-05-02 18:54:51,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:54:51,422 INFO L225 Difference]: With dead ends: 112 [2021-05-02 18:54:51,422 INFO L226 Difference]: Without dead ends: 112 [2021-05-02 18:54:51,422 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 97 SyntacticMatches, 1 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 824 ImplicationChecksByTransitivity, 2305.4ms TimeCoverageRelationStatistics Valid=333, Invalid=6977, Unknown=0, NotChecked=0, Total=7310 [2021-05-02 18:54:51,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-05-02 18:54:51,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 104. [2021-05-02 18:54:51,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 98 states have (on average 1.0510204081632653) internal successors, (103), 98 states have internal predecessors, (103), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:54:51,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 108 transitions. [2021-05-02 18:54:51,424 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 108 transitions. Word has length 95 [2021-05-02 18:54:51,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:54:51,424 INFO L480 AbstractCegarLoop]: Abstraction has 104 states and 108 transitions. [2021-05-02 18:54:51,424 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 2.088888888888889) internal successors, (94), 44 states have internal predecessors, (94), 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 18:54:51,424 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 108 transitions. [2021-05-02 18:54:51,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-02 18:54:51,424 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:54:51,424 INFO L523 BasicCegarLoop]: trace histogram [41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:54:51,625 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:54:51,625 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:54:51,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:54:51,625 INFO L82 PathProgramCache]: Analyzing trace with hash 572551737, now seen corresponding path program 41 times [2021-05-02 18:54:51,625 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:54:51,625 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1214364692] [2021-05-02 18:54:51,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:54:51,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:54:52,584 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:54:52,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:54:52,587 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:54:52,587 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:54:52,587 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1214364692] [2021-05-02 18:54:52,587 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1214364692] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:54:52,587 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1077415646] [2021-05-02 18:54:52,587 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 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:55:49,358 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 42 check-sat command(s) [2021-05-02 18:55:49,358 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:55:49,372 WARN L261 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 125 conjunts are in the unsatisfiable core [2021-05-02 18:55:49,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:55:50,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:55:50,395 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:55:50,396 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1077415646] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:55:50,396 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:55:50,396 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44] total 46 [2021-05-02 18:55:50,396 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1758143474] [2021-05-02 18:55:50,396 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 18:55:50,396 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:55:50,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 18:55:50,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1939, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 18:55:50,397 INFO L87 Difference]: Start difference. First operand 104 states and 108 transitions. Second operand has 46 states, 46 states have (on average 2.0869565217391304) internal successors, (96), 45 states have internal predecessors, (96), 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 18:55:53,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:55:53,674 INFO L93 Difference]: Finished difference Result 114 states and 121 transitions. [2021-05-02 18:55:53,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 18:55:53,674 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.0869565217391304) internal successors, (96), 45 states have internal predecessors, (96), 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 97 [2021-05-02 18:55:53,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:55:53,675 INFO L225 Difference]: With dead ends: 114 [2021-05-02 18:55:53,675 INFO L226 Difference]: Without dead ends: 114 [2021-05-02 18:55:53,675 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 59 SyntacticMatches, 41 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 945 ImplicationChecksByTransitivity, 3344.3ms TimeCoverageRelationStatistics Valid=341, Invalid=7315, Unknown=0, NotChecked=0, Total=7656 [2021-05-02 18:55:53,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-05-02 18:55:53,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 106. [2021-05-02 18:55:53,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 100 states have (on average 1.05) internal successors, (105), 100 states have internal predecessors, (105), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:55:53,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 110 transitions. [2021-05-02 18:55:53,677 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 110 transitions. Word has length 97 [2021-05-02 18:55:53,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:55:53,677 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 110 transitions. [2021-05-02 18:55:53,677 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 2.0869565217391304) internal successors, (96), 45 states have internal predecessors, (96), 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 18:55:53,677 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 110 transitions. [2021-05-02 18:55:53,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-02 18:55:53,678 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:55:53,678 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:55:53,878 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-05-02 18:55:53,878 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:55:53,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:55:53,879 INFO L82 PathProgramCache]: Analyzing trace with hash 1377802391, now seen corresponding path program 42 times [2021-05-02 18:55:53,879 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:55:53,879 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [725290488] [2021-05-02 18:55:53,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:55:53,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:55:54,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:55:54,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:55:54,866 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:55:54,866 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:55:54,866 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [725290488] [2021-05-02 18:55:54,866 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [725290488] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:55:54,866 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1256175726] [2021-05-02 18:55:54,866 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 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:55:59,711 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 43 check-sat command(s) [2021-05-02 18:55:59,711 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:55:59,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 115 conjunts are in the unsatisfiable core [2021-05-02 18:55:59,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:55:59,737 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:55:59,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:55:59,746 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:55:59,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:56:00,379 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:56:00,379 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1256175726] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:56:00,379 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:56:00,379 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45] total 47 [2021-05-02 18:56:00,379 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912755356] [2021-05-02 18:56:00,380 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 18:56:00,380 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:56:00,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 18:56:00,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2028, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 18:56:00,380 INFO L87 Difference]: Start difference. First operand 106 states and 110 transitions. Second operand has 47 states, 47 states have (on average 2.0851063829787235) internal successors, (98), 46 states have internal predecessors, (98), 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 18:56:03,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:56:03,724 INFO L93 Difference]: Finished difference Result 116 states and 123 transitions. [2021-05-02 18:56:03,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 18:56:03,724 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.0851063829787235) internal successors, (98), 46 states have internal predecessors, (98), 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 99 [2021-05-02 18:56:03,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:56:03,725 INFO L225 Difference]: With dead ends: 116 [2021-05-02 18:56:03,725 INFO L226 Difference]: Without dead ends: 116 [2021-05-02 18:56:03,725 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 82 SyntacticMatches, 20 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 943 ImplicationChecksByTransitivity, 3003.8ms TimeCoverageRelationStatistics Valid=349, Invalid=7661, Unknown=0, NotChecked=0, Total=8010 [2021-05-02 18:56:03,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-05-02 18:56:03,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 108. [2021-05-02 18:56:03,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 102 states have (on average 1.0490196078431373) internal successors, (107), 102 states have internal predecessors, (107), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:56:03,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 112 transitions. [2021-05-02 18:56:03,727 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 112 transitions. Word has length 99 [2021-05-02 18:56:03,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:56:03,727 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 112 transitions. [2021-05-02 18:56:03,727 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 2.0851063829787235) internal successors, (98), 46 states have internal predecessors, (98), 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 18:56:03,727 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 112 transitions. [2021-05-02 18:56:03,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 18:56:03,728 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:56:03,728 INFO L523 BasicCegarLoop]: trace histogram [43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:56:03,928 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,43 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:56:03,928 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:56:03,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:56:03,928 INFO L82 PathProgramCache]: Analyzing trace with hash 2129567605, now seen corresponding path program 43 times [2021-05-02 18:56:03,929 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:56:03,929 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [233888979] [2021-05-02 18:56:03,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:56:03,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:56:05,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:56:05,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:56:05,079 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:56:05,079 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:56:05,079 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [233888979] [2021-05-02 18:56:05,079 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [233888979] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:56:05,086 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [620066715] [2021-05-02 18:56:05,086 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 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:56:05,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:56:05,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-02 18:56:05,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:56:05,311 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:56:05,316 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:56:05,316 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [620066715] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:56:05,316 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:56:05,316 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46] total 48 [2021-05-02 18:56:05,316 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098324996] [2021-05-02 18:56:05,317 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-02 18:56:05,317 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:56:05,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-02 18:56:05,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=2119, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 18:56:05,317 INFO L87 Difference]: Start difference. First operand 108 states and 112 transitions. Second operand has 48 states, 48 states have (on average 2.0833333333333335) internal successors, (100), 47 states have internal predecessors, (100), 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 18:56:08,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:56:08,821 INFO L93 Difference]: Finished difference Result 118 states and 125 transitions. [2021-05-02 18:56:08,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 18:56:08,821 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.0833333333333335) internal successors, (100), 47 states have internal predecessors, (100), 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 18:56:08,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:56:08,822 INFO L225 Difference]: With dead ends: 118 [2021-05-02 18:56:08,822 INFO L226 Difference]: Without dead ends: 118 [2021-05-02 18:56:08,822 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 950 ImplicationChecksByTransitivity, 2840.1ms TimeCoverageRelationStatistics Valid=357, Invalid=8015, Unknown=0, NotChecked=0, Total=8372 [2021-05-02 18:56:08,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-05-02 18:56:08,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 110. [2021-05-02 18:56:08,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 104 states have (on average 1.0480769230769231) internal successors, (109), 104 states have internal predecessors, (109), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:56:08,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 114 transitions. [2021-05-02 18:56:08,824 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 114 transitions. Word has length 101 [2021-05-02 18:56:08,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:56:08,824 INFO L480 AbstractCegarLoop]: Abstraction has 110 states and 114 transitions. [2021-05-02 18:56:08,824 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 2.0833333333333335) internal successors, (100), 47 states have internal predecessors, (100), 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 18:56:08,824 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 114 transitions. [2021-05-02 18:56:08,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-05-02 18:56:08,825 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:56:08,825 INFO L523 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:56:09,025 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,44 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:56:09,025 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:56:09,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:56:09,026 INFO L82 PathProgramCache]: Analyzing trace with hash -1273534765, now seen corresponding path program 44 times [2021-05-02 18:56:09,026 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:56:09,026 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [350181153] [2021-05-02 18:56:09,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:56:09,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:56:09,762 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:56:09,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:56:09,767 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:56:09,767 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:56:09,768 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [350181153] [2021-05-02 18:56:09,768 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [350181153] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:56:09,768 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [925066948] [2021-05-02 18:56:09,768 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 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:56:09,824 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:56:09,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:56:09,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 91 conjunts are in the unsatisfiable core [2021-05-02 18:56:09,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:56:09,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:56:10,003 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:56:10,003 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [925066948] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:56:10,003 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:56:10,003 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47] total 49 [2021-05-02 18:56:10,003 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1062045008] [2021-05-02 18:56:10,004 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 18:56:10,004 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:56:10,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 18:56:10,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=2212, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 18:56:10,004 INFO L87 Difference]: Start difference. First operand 110 states and 114 transitions. Second operand has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 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 18:56:13,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:56:13,428 INFO L93 Difference]: Finished difference Result 120 states and 127 transitions. [2021-05-02 18:56:13,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-02 18:56:13,429 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 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 103 [2021-05-02 18:56:13,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:56:13,429 INFO L225 Difference]: With dead ends: 120 [2021-05-02 18:56:13,429 INFO L226 Difference]: Without dead ends: 120 [2021-05-02 18:56:13,430 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 105 SyntacticMatches, 1 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 994 ImplicationChecksByTransitivity, 2332.6ms TimeCoverageRelationStatistics Valid=365, Invalid=8377, Unknown=0, NotChecked=0, Total=8742 [2021-05-02 18:56:13,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-05-02 18:56:13,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 112. [2021-05-02 18:56:13,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 106 states have (on average 1.0471698113207548) internal successors, (111), 106 states have internal predecessors, (111), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:56:13,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 116 transitions. [2021-05-02 18:56:13,431 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 116 transitions. Word has length 103 [2021-05-02 18:56:13,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:56:13,431 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 116 transitions. [2021-05-02 18:56:13,431 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 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 18:56:13,431 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 116 transitions. [2021-05-02 18:56:13,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-02 18:56:13,432 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:56:13,432 INFO L523 BasicCegarLoop]: trace histogram [45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:56:13,632 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-05-02 18:56:13,632 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:56:13,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:56:13,633 INFO L82 PathProgramCache]: Analyzing trace with hash 1110167217, now seen corresponding path program 45 times [2021-05-02 18:56:13,633 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:56:13,633 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [630715053] [2021-05-02 18:56:13,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:56:13,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:56:14,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:56:14,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:56:14,755 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:56:14,755 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:56:14,755 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [630715053] [2021-05-02 18:56:14,755 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [630715053] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:56:14,755 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1084870139] [2021-05-02 18:56:14,755 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 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:56:16,981 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2021-05-02 18:56:16,982 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:56:16,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 111 conjunts are in the unsatisfiable core [2021-05-02 18:56:16,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:56:17,806 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:56:17,812 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:56:17,812 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1084870139] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:56:17,812 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:56:17,813 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-05-02 18:56:17,813 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1825450070] [2021-05-02 18:56:17,813 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 18:56:17,813 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:56:17,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 18:56:17,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 18:56:17,813 INFO L87 Difference]: Start difference. First operand 112 states and 116 transitions. Second operand has 50 states, 50 states have (on average 2.08) internal successors, (104), 49 states have internal predecessors, (104), 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 18:56:21,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:56:21,640 INFO L93 Difference]: Finished difference Result 122 states and 129 transitions. [2021-05-02 18:56:21,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 18:56:21,640 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.08) internal successors, (104), 49 states have internal predecessors, (104), 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 105 [2021-05-02 18:56:21,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:56:21,641 INFO L225 Difference]: With dead ends: 122 [2021-05-02 18:56:21,641 INFO L226 Difference]: Without dead ends: 122 [2021-05-02 18:56:21,641 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 89 SyntacticMatches, 19 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1075 ImplicationChecksByTransitivity, 3605.8ms TimeCoverageRelationStatistics Valid=373, Invalid=8747, Unknown=0, NotChecked=0, Total=9120 [2021-05-02 18:56:21,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-05-02 18:56:21,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 114. [2021-05-02 18:56:21,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 108 states have (on average 1.0462962962962963) internal successors, (113), 108 states have internal predecessors, (113), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:56:21,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 118 transitions. [2021-05-02 18:56:21,643 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 118 transitions. Word has length 105 [2021-05-02 18:56:21,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:56:21,643 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 118 transitions. [2021-05-02 18:56:21,643 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 2.08) internal successors, (104), 49 states have internal predecessors, (104), 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 18:56:21,643 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 118 transitions. [2021-05-02 18:56:21,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-02 18:56:21,644 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:56:21,644 INFO L523 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:56:21,844 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-05-02 18:56:21,844 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:56:21,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:56:21,845 INFO L82 PathProgramCache]: Analyzing trace with hash -1664764145, now seen corresponding path program 46 times [2021-05-02 18:56:21,845 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:56:21,845 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126039522] [2021-05-02 18:56:21,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:56:21,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:56:23,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:56:23,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:56:23,071 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:56:23,071 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:56:23,071 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [126039522] [2021-05-02 18:56:23,071 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [126039522] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:56:23,071 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1430431921] [2021-05-02 18:56:23,071 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 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:56:23,123 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:56:23,124 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:56:23,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 95 conjunts are in the unsatisfiable core [2021-05-02 18:56:23,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:56:23,310 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:56:23,316 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:56:23,316 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1430431921] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:56:23,316 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:56:23,316 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 49] total 51 [2021-05-02 18:56:23,316 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796461035] [2021-05-02 18:56:23,317 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 18:56:23,317 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:56:23,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 18:56:23,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=2404, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 18:56:23,317 INFO L87 Difference]: Start difference. First operand 114 states and 118 transitions. Second operand has 51 states, 51 states have (on average 2.0784313725490198) internal successors, (106), 50 states have internal predecessors, (106), 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 18:56:27,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:56:27,324 INFO L93 Difference]: Finished difference Result 124 states and 131 transitions. [2021-05-02 18:56:27,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 18:56:27,324 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.0784313725490198) internal successors, (106), 50 states have internal predecessors, (106), 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 107 [2021-05-02 18:56:27,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:56:27,325 INFO L225 Difference]: With dead ends: 124 [2021-05-02 18:56:27,325 INFO L226 Difference]: Without dead ends: 124 [2021-05-02 18:56:27,325 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 109 SyntacticMatches, 1 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1085 ImplicationChecksByTransitivity, 3170.2ms TimeCoverageRelationStatistics Valid=381, Invalid=9125, Unknown=0, NotChecked=0, Total=9506 [2021-05-02 18:56:27,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-05-02 18:56:27,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 116. [2021-05-02 18:56:27,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 110 states have (on average 1.0454545454545454) internal successors, (115), 110 states have internal predecessors, (115), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:56:27,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 120 transitions. [2021-05-02 18:56:27,327 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 120 transitions. Word has length 107 [2021-05-02 18:56:27,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:56:27,327 INFO L480 AbstractCegarLoop]: Abstraction has 116 states and 120 transitions. [2021-05-02 18:56:27,327 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 2.0784313725490198) internal successors, (106), 50 states have internal predecessors, (106), 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 18:56:27,327 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 120 transitions. [2021-05-02 18:56:27,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-05-02 18:56:27,328 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:56:27,328 INFO L523 BasicCegarLoop]: trace histogram [47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:56:27,528 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-05-02 18:56:27,528 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:56:27,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:56:27,529 INFO L82 PathProgramCache]: Analyzing trace with hash -1199112211, now seen corresponding path program 47 times [2021-05-02 18:56:27,529 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:56:27,529 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2025378982] [2021-05-02 18:56:27,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:56:27,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:56:28,783 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:56:28,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:56:28,786 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:56:28,786 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:56:28,786 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2025378982] [2021-05-02 18:56:28,786 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2025378982] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:56:28,786 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [717180684] [2021-05-02 18:56:28,786 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 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:58:10,427 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 48 check-sat command(s) [2021-05-02 18:58:10,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:58:10,451 WARN L261 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 142 conjunts are in the unsatisfiable core [2021-05-02 18:58:10,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:58:11,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:58:11,686 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:58:11,686 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [717180684] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:58:11,686 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:58:11,686 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50] total 52 [2021-05-02 18:58:11,686 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [351897648] [2021-05-02 18:58:11,686 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-02 18:58:11,686 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:58:11,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-02 18:58:11,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=2503, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 18:58:11,687 INFO L87 Difference]: Start difference. First operand 116 states and 120 transitions. Second operand has 52 states, 52 states have (on average 2.076923076923077) internal successors, (108), 51 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 18:58:15,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:58:15,901 INFO L93 Difference]: Finished difference Result 126 states and 133 transitions. [2021-05-02 18:58:15,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 18:58:15,902 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.076923076923077) internal successors, (108), 51 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 109 [2021-05-02 18:58:15,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:58:15,902 INFO L225 Difference]: With dead ends: 126 [2021-05-02 18:58:15,902 INFO L226 Difference]: Without dead ends: 126 [2021-05-02 18:58:15,903 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 66 SyntacticMatches, 46 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1222 ImplicationChecksByTransitivity, 4236.6ms TimeCoverageRelationStatistics Valid=389, Invalid=9511, Unknown=0, NotChecked=0, Total=9900 [2021-05-02 18:58:15,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-05-02 18:58:15,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 118. [2021-05-02 18:58:15,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 112 states have (on average 1.0446428571428572) internal successors, (117), 112 states have internal predecessors, (117), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:58:15,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 122 transitions. [2021-05-02 18:58:15,904 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 122 transitions. Word has length 109 [2021-05-02 18:58:15,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:58:15,905 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 122 transitions. [2021-05-02 18:58:15,905 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 2.076923076923077) internal successors, (108), 51 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 18:58:15,905 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 122 transitions. [2021-05-02 18:58:15,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-05-02 18:58:15,905 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:58:15,905 INFO L523 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:58:16,113 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:58:16,113 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:58:16,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:58:16,113 INFO L82 PathProgramCache]: Analyzing trace with hash -384202421, now seen corresponding path program 48 times [2021-05-02 18:58:16,113 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:58:16,114 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [32792219] [2021-05-02 18:58:16,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:58:16,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:58:17,390 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:58:17,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:58:17,393 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:58:17,393 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:58:17,393 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [32792219] [2021-05-02 18:58:17,393 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [32792219] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:58:17,393 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [916414364] [2021-05-02 18:58:17,393 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 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:58:36,375 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 49 check-sat command(s) [2021-05-02 18:58:36,375 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:58:36,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 110 conjunts are in the unsatisfiable core [2021-05-02 18:58:36,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:58:36,776 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:58:36,776 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [916414364] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:58:36,776 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:58:36,776 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51] total 53 [2021-05-02 18:58:36,776 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379670183] [2021-05-02 18:58:36,777 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-02 18:58:36,777 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:58:36,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-02 18:58:36,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=2604, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 18:58:36,777 INFO L87 Difference]: Start difference. First operand 118 states and 122 transitions. Second operand has 53 states, 53 states have (on average 2.0754716981132075) internal successors, (110), 52 states have internal predecessors, (110), 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 18:58:41,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:58:41,133 INFO L93 Difference]: Finished difference Result 128 states and 135 transitions. [2021-05-02 18:58:41,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-02 18:58:41,133 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.0754716981132075) internal successors, (110), 52 states have internal predecessors, (110), 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 111 [2021-05-02 18:58:41,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:58:41,134 INFO L225 Difference]: With dead ends: 128 [2021-05-02 18:58:41,134 INFO L226 Difference]: Without dead ends: 128 [2021-05-02 18:58:41,134 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 107 SyntacticMatches, 7 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1190 ImplicationChecksByTransitivity, 3509.6ms TimeCoverageRelationStatistics Valid=397, Invalid=9905, Unknown=0, NotChecked=0, Total=10302 [2021-05-02 18:58:41,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-05-02 18:58:41,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 120. [2021-05-02 18:58:41,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 114 states have (on average 1.043859649122807) internal successors, (119), 114 states have internal predecessors, (119), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:58:41,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 124 transitions. [2021-05-02 18:58:41,136 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 124 transitions. Word has length 111 [2021-05-02 18:58:41,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:58:41,136 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 124 transitions. [2021-05-02 18:58:41,136 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 2.0754716981132075) internal successors, (110), 52 states have internal predecessors, (110), 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 18:58:41,136 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 124 transitions. [2021-05-02 18:58:41,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-02 18:58:41,136 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:58:41,137 INFO L523 BasicCegarLoop]: trace histogram [49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:58:41,337 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-05-02 18:58:41,337 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:58:41,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:58:41,337 INFO L82 PathProgramCache]: Analyzing trace with hash 1060057897, now seen corresponding path program 49 times [2021-05-02 18:58:41,337 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:58:41,338 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1825271152] [2021-05-02 18:58:41,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:58:41,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:58:42,591 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:58:42,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:58:42,594 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 0 proven. 2401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:58:42,594 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:58:42,594 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1825271152] [2021-05-02 18:58:42,594 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1825271152] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:58:42,594 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1827683209] [2021-05-02 18:58:42,594 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 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:58:42,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:58:42,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 101 conjunts are in the unsatisfiable core [2021-05-02 18:58:42,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:58:42,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:58:42,886 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 0 proven. 2401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:58:42,886 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1827683209] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:58:42,886 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:58:42,886 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 52] total 54 [2021-05-02 18:58:42,886 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515294269] [2021-05-02 18:58:42,887 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-02 18:58:42,887 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:58:42,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-02 18:58:42,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=2707, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 18:58:42,887 INFO L87 Difference]: Start difference. First operand 120 states and 124 transitions. Second operand has 54 states, 54 states have (on average 2.074074074074074) internal successors, (112), 53 states have internal predecessors, (112), 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 18:58:47,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:58:47,400 INFO L93 Difference]: Finished difference Result 130 states and 137 transitions. [2021-05-02 18:58:47,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 18:58:47,401 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.074074074074074) internal successors, (112), 53 states have internal predecessors, (112), 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 113 [2021-05-02 18:58:47,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:58:47,401 INFO L225 Difference]: With dead ends: 130 [2021-05-02 18:58:47,401 INFO L226 Difference]: Without dead ends: 130 [2021-05-02 18:58:47,402 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 115 SyntacticMatches, 1 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1229 ImplicationChecksByTransitivity, 3329.5ms TimeCoverageRelationStatistics Valid=405, Invalid=10307, Unknown=0, NotChecked=0, Total=10712 [2021-05-02 18:58:47,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-05-02 18:58:47,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 122. [2021-05-02 18:58:47,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 116 states have (on average 1.043103448275862) internal successors, (121), 116 states have internal predecessors, (121), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:58:47,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 126 transitions. [2021-05-02 18:58:47,403 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 126 transitions. Word has length 113 [2021-05-02 18:58:47,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:58:47,404 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 126 transitions. [2021-05-02 18:58:47,404 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 2.074074074074074) internal successors, (112), 53 states have internal predecessors, (112), 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 18:58:47,404 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 126 transitions. [2021-05-02 18:58:47,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-05-02 18:58:47,404 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:58:47,404 INFO L523 BasicCegarLoop]: trace histogram [50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:58:47,604 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,50 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:58:47,605 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:58:47,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:58:47,605 INFO L82 PathProgramCache]: Analyzing trace with hash 1719786887, now seen corresponding path program 50 times [2021-05-02 18:58:47,605 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:58:47,605 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [602854133] [2021-05-02 18:58:47,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:58:47,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:58:48,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:58:48,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:58:48,890 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:58:48,890 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:58:48,890 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [602854133] [2021-05-02 18:58:48,891 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [602854133] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:58:48,891 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1071357855] [2021-05-02 18:58:48,891 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 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:58:48,937 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:58:48,937 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:58:48,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 103 conjunts are in the unsatisfiable core [2021-05-02 18:58:48,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:58:49,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:58:49,148 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:58:49,148 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1071357855] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:58:49,148 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:58:49,149 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 53] total 55 [2021-05-02 18:58:49,149 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733809924] [2021-05-02 18:58:49,149 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-02 18:58:49,149 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:58:49,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-02 18:58:49,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=2812, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 18:58:49,149 INFO L87 Difference]: Start difference. First operand 122 states and 126 transitions. Second operand has 55 states, 55 states have (on average 2.0727272727272728) internal successors, (114), 54 states have internal predecessors, (114), 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 18:58:53,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:58:53,295 INFO L93 Difference]: Finished difference Result 132 states and 139 transitions. [2021-05-02 18:58:53,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-02 18:58:53,295 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.0727272727272728) internal successors, (114), 54 states have internal predecessors, (114), 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 115 [2021-05-02 18:58:53,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:58:53,296 INFO L225 Difference]: With dead ends: 132 [2021-05-02 18:58:53,296 INFO L226 Difference]: Without dead ends: 132 [2021-05-02 18:58:53,297 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 117 SyntacticMatches, 1 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1279 ImplicationChecksByTransitivity, 3175.7ms TimeCoverageRelationStatistics Valid=413, Invalid=10717, Unknown=0, NotChecked=0, Total=11130 [2021-05-02 18:58:53,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-05-02 18:58:53,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 124. [2021-05-02 18:58:53,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 118 states have (on average 1.0423728813559323) internal successors, (123), 118 states have internal predecessors, (123), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:58:53,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 128 transitions. [2021-05-02 18:58:53,298 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 128 transitions. Word has length 115 [2021-05-02 18:58:53,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:58:53,298 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 128 transitions. [2021-05-02 18:58:53,298 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 55 states have (on average 2.0727272727272728) internal successors, (114), 54 states have internal predecessors, (114), 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 18:58:53,298 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 128 transitions. [2021-05-02 18:58:53,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-05-02 18:58:53,299 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:58:53,299 INFO L523 BasicCegarLoop]: trace histogram [51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:58:53,499 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,51 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:58:53,499 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:58:53,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:58:53,500 INFO L82 PathProgramCache]: Analyzing trace with hash 64186469, now seen corresponding path program 51 times [2021-05-02 18:58:53,500 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:58:53,500 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [682656108] [2021-05-02 18:58:53,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:58:53,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:58:54,804 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:58:54,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:58:54,807 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 0 proven. 2601 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:58:54,807 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:58:54,807 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [682656108] [2021-05-02 18:58:54,807 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [682656108] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:58:54,807 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1468082825] [2021-05-02 18:58:54,807 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 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:58:58,732 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2021-05-02 18:58:58,732 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:58:58,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 123 conjunts are in the unsatisfiable core [2021-05-02 18:58:58,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:58:59,466 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 0 proven. 2601 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:58:59,466 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1468082825] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:58:59,466 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:58:59,466 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54] total 56 [2021-05-02 18:58:59,466 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140524378] [2021-05-02 18:58:59,467 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-02 18:58:59,467 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:58:59,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-02 18:58:59,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=2919, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 18:58:59,467 INFO L87 Difference]: Start difference. First operand 124 states and 128 transitions. Second operand has 56 states, 56 states have (on average 2.0714285714285716) internal successors, (116), 55 states have internal predecessors, (116), 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 18:59:04,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:59:04,541 INFO L93 Difference]: Finished difference Result 134 states and 141 transitions. [2021-05-02 18:59:04,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 18:59:04,542 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.0714285714285716) internal successors, (116), 55 states have internal predecessors, (116), 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 117 [2021-05-02 18:59:04,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:59:04,543 INFO L225 Difference]: With dead ends: 134 [2021-05-02 18:59:04,543 INFO L226 Difference]: Without dead ends: 134 [2021-05-02 18:59:04,543 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 106 SyntacticMatches, 14 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1354 ImplicationChecksByTransitivity, 4175.1ms TimeCoverageRelationStatistics Valid=421, Invalid=11135, Unknown=0, NotChecked=0, Total=11556 [2021-05-02 18:59:04,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-05-02 18:59:04,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 126. [2021-05-02 18:59:04,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 120 states have (on average 1.0416666666666667) internal successors, (125), 120 states have internal predecessors, (125), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:59:04,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 130 transitions. [2021-05-02 18:59:04,545 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 130 transitions. Word has length 117 [2021-05-02 18:59:04,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:59:04,545 INFO L480 AbstractCegarLoop]: Abstraction has 126 states and 130 transitions. [2021-05-02 18:59:04,545 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 56 states have (on average 2.0714285714285716) internal successors, (116), 55 states have internal predecessors, (116), 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 18:59:04,545 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 130 transitions. [2021-05-02 18:59:04,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-05-02 18:59:04,546 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:59:04,546 INFO L523 BasicCegarLoop]: trace histogram [52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:59:04,746 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-05-02 18:59:04,746 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:59:04,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:59:04,747 INFO L82 PathProgramCache]: Analyzing trace with hash -1829915709, now seen corresponding path program 52 times [2021-05-02 18:59:04,747 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:59:04,747 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1088590591] [2021-05-02 18:59:04,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:59:04,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:59:06,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:59:06,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:59:06,307 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:59:06,307 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:59:06,307 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1088590591] [2021-05-02 18:59:06,307 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1088590591] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:59:06,307 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1126367433] [2021-05-02 18:59:06,308 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 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:59:06,374 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:59:06,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:59:06,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 107 conjunts are in the unsatisfiable core [2021-05-02 18:59:06,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:59:06,603 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:59:06,620 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:59:06,621 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1126367433] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:59:06,621 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:59:06,621 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 55] total 57 [2021-05-02 18:59:06,621 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519455013] [2021-05-02 18:59:06,621 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-02 18:59:06,621 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:59:06,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-02 18:59:06,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=3028, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 18:59:06,622 INFO L87 Difference]: Start difference. First operand 126 states and 130 transitions. Second operand has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 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 18:59:11,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:59:11,983 INFO L93 Difference]: Finished difference Result 136 states and 143 transitions. [2021-05-02 18:59:11,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-02 18:59:11,984 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 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 119 [2021-05-02 18:59:11,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:59:11,984 INFO L225 Difference]: With dead ends: 136 [2021-05-02 18:59:11,984 INFO L226 Difference]: Without dead ends: 136 [2021-05-02 18:59:11,985 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 121 SyntacticMatches, 1 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1382 ImplicationChecksByTransitivity, 3987.5ms TimeCoverageRelationStatistics Valid=429, Invalid=11561, Unknown=0, NotChecked=0, Total=11990 [2021-05-02 18:59:11,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-05-02 18:59:11,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 128. [2021-05-02 18:59:11,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 122 states have (on average 1.040983606557377) internal successors, (127), 122 states have internal predecessors, (127), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:59:11,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 132 transitions. [2021-05-02 18:59:11,987 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 132 transitions. Word has length 119 [2021-05-02 18:59:11,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:59:11,987 INFO L480 AbstractCegarLoop]: Abstraction has 128 states and 132 transitions. [2021-05-02 18:59:11,987 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 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 18:59:11,987 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 132 transitions. [2021-05-02 18:59:11,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-05-02 18:59:11,987 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:59:11,987 INFO L523 BasicCegarLoop]: trace histogram [53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:59:12,200 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,53 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:59:12,201 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:59:12,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:59:12,201 INFO L82 PathProgramCache]: Analyzing trace with hash -995975263, now seen corresponding path program 53 times [2021-05-02 18:59:12,201 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:59:12,201 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [3614684] [2021-05-02 18:59:12,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:59:12,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:59:13,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:59:13,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:59:13,328 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 0 proven. 2809 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:59:13,328 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:59:13,328 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [3614684] [2021-05-02 18:59:13,328 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [3614684] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:59:13,328 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [267197284] [2021-05-02 18:59:13,329 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 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:01:30,282 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 54 check-sat command(s) [2021-05-02 19:01:30,282 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:01:30,308 WARN L261 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 159 conjunts are in the unsatisfiable core [2021-05-02 19:01:30,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:01:31,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:31,998 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 0 proven. 2809 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:01:31,999 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [267197284] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:01:31,999 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:01:31,999 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 56] total 58 [2021-05-02 19:01:31,999 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381565551] [2021-05-02 19:01:32,005 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-02 19:01:32,005 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:01:32,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-02 19:01:32,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=3139, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 19:01:32,006 INFO L87 Difference]: Start difference. First operand 128 states and 132 transitions. Second operand has 58 states, 58 states have (on average 2.0689655172413794) internal successors, (120), 57 states have internal predecessors, (120), 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 19:01:37,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:01:37,497 INFO L93 Difference]: Finished difference Result 138 states and 145 transitions. [2021-05-02 19:01:37,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-02 19:01:37,497 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.0689655172413794) internal successors, (120), 57 states have internal predecessors, (120), 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 121 [2021-05-02 19:01:37,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:01:37,498 INFO L225 Difference]: With dead ends: 138 [2021-05-02 19:01:37,498 INFO L226 Difference]: Without dead ends: 138 [2021-05-02 19:01:37,499 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 73 SyntacticMatches, 51 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1535 ImplicationChecksByTransitivity, 5128.2ms TimeCoverageRelationStatistics Valid=437, Invalid=11995, Unknown=0, NotChecked=0, Total=12432 [2021-05-02 19:01:37,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-05-02 19:01:37,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 130. [2021-05-02 19:01:37,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 124 states have (on average 1.0403225806451613) internal successors, (129), 124 states have internal predecessors, (129), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 19:01:37,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 134 transitions. [2021-05-02 19:01:37,501 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 134 transitions. Word has length 121 [2021-05-02 19:01:37,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:01:37,501 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 134 transitions. [2021-05-02 19:01:37,501 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 2.0689655172413794) internal successors, (120), 57 states have internal predecessors, (120), 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 19:01:37,501 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 134 transitions. [2021-05-02 19:01:37,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-05-02 19:01:37,502 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:01:37,502 INFO L523 BasicCegarLoop]: trace histogram [54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:01:37,702 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-05-02 19:01:37,703 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:01:37,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:01:37,703 INFO L82 PathProgramCache]: Analyzing trace with hash 1556876287, now seen corresponding path program 54 times [2021-05-02 19:01:37,703 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:01:37,703 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [678870645] [2021-05-02 19:01:37,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:01:37,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:38,826 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:01:38,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:38,830 INFO L134 CoverageAnalysis]: Checked inductivity of 2916 backedges. 0 proven. 2916 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:01:38,830 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:01:38,831 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [678870645] [2021-05-02 19:01:38,831 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [678870645] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:01:38,831 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1700159602] [2021-05-02 19:01:38,831 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 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:01:49,740 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 55 check-sat command(s) [2021-05-02 19:01:49,741 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:01:49,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 115 conjunts are in the unsatisfiable core [2021-05-02 19:01:49,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:01:50,132 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:50,137 INFO L134 CoverageAnalysis]: Checked inductivity of 2916 backedges. 0 proven. 2916 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:01:50,137 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1700159602] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:01:50,137 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:01:50,137 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 57] total 59 [2021-05-02 19:01:50,137 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506202185] [2021-05-02 19:01:50,138 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-02 19:01:50,138 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:01:50,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-02 19:01:50,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=3252, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 19:01:50,138 INFO L87 Difference]: Start difference. First operand 130 states and 134 transitions. Second operand has 59 states, 59 states have (on average 2.0677966101694913) internal successors, (122), 58 states have internal predecessors, (122), 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 19:01:53,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:01:53,815 INFO L93 Difference]: Finished difference Result 140 states and 147 transitions. [2021-05-02 19:01:53,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-02 19:01:53,815 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.0677966101694913) internal successors, (122), 58 states have internal predecessors, (122), 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 123 [2021-05-02 19:01:53,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:01:53,816 INFO L225 Difference]: With dead ends: 140 [2021-05-02 19:01:53,816 INFO L226 Difference]: Without dead ends: 140 [2021-05-02 19:01:53,817 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 121 SyntacticMatches, 5 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1497 ImplicationChecksByTransitivity, 2992.8ms TimeCoverageRelationStatistics Valid=445, Invalid=12437, Unknown=0, NotChecked=0, Total=12882 [2021-05-02 19:01:53,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-05-02 19:01:53,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 132. [2021-05-02 19:01:53,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 126 states have (on average 1.0396825396825398) internal successors, (131), 126 states have internal predecessors, (131), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 19:01:53,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 136 transitions. [2021-05-02 19:01:53,818 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 136 transitions. Word has length 123 [2021-05-02 19:01:53,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:01:53,818 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 136 transitions. [2021-05-02 19:01:53,819 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 59 states have (on average 2.0677966101694913) internal successors, (122), 58 states have internal predecessors, (122), 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 19:01:53,819 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 136 transitions. [2021-05-02 19:01:53,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-02 19:01:53,819 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:01:53,819 INFO L523 BasicCegarLoop]: trace histogram [55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:01:54,026 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-05-02 19:01:54,026 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:01:54,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:01:54,026 INFO L82 PathProgramCache]: Analyzing trace with hash -1874077475, now seen corresponding path program 55 times [2021-05-02 19:01:54,027 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:01:54,027 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [854105250] [2021-05-02 19:01:54,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:01:54,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:55,203 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:01:55,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:55,206 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 0 proven. 3025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:01:55,206 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:01:55,206 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [854105250] [2021-05-02 19:01:55,207 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [854105250] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:01:55,207 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [129885656] [2021-05-02 19:01:55,207 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 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:01:55,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:55,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 113 conjunts are in the unsatisfiable core [2021-05-02 19:01:55,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:01:55,422 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:55,427 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 0 proven. 3025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:01:55,427 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [129885656] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:01:55,427 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:01:55,427 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58] total 60 [2021-05-02 19:01:55,427 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2131804938] [2021-05-02 19:01:55,427 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-02 19:01:55,427 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:01:55,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-02 19:01:55,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=3367, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 19:01:55,428 INFO L87 Difference]: Start difference. First operand 132 states and 136 transitions. Second operand has 60 states, 60 states have (on average 2.066666666666667) internal successors, (124), 59 states have internal predecessors, (124), 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 19:01:59,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:01:59,385 INFO L93 Difference]: Finished difference Result 142 states and 149 transitions. [2021-05-02 19:01:59,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-02 19:01:59,386 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.066666666666667) internal successors, (124), 59 states have internal predecessors, (124), 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 125 [2021-05-02 19:01:59,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:01:59,386 INFO L225 Difference]: With dead ends: 142 [2021-05-02 19:01:59,386 INFO L226 Difference]: Without dead ends: 142 [2021-05-02 19:01:59,387 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 127 SyntacticMatches, 1 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1544 ImplicationChecksByTransitivity, 2979.7ms TimeCoverageRelationStatistics Valid=453, Invalid=12887, Unknown=0, NotChecked=0, Total=13340 [2021-05-02 19:01:59,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-05-02 19:01:59,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 134. [2021-05-02 19:01:59,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 128 states have (on average 1.0390625) internal successors, (133), 128 states have internal predecessors, (133), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 19:01:59,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 138 transitions. [2021-05-02 19:01:59,389 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 138 transitions. Word has length 125 [2021-05-02 19:01:59,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:01:59,389 INFO L480 AbstractCegarLoop]: Abstraction has 134 states and 138 transitions. [2021-05-02 19:01:59,389 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 60 states have (on average 2.066666666666667) internal successors, (124), 59 states have internal predecessors, (124), 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 19:01:59,389 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 138 transitions. [2021-05-02 19:01:59,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-05-02 19:01:59,389 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:01:59,389 INFO L523 BasicCegarLoop]: trace histogram [56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:01:59,606 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,56 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:01:59,606 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:01:59,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:01:59,607 INFO L82 PathProgramCache]: Analyzing trace with hash -485759429, now seen corresponding path program 56 times [2021-05-02 19:01:59,607 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:01:59,607 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [775343847] [2021-05-02 19:01:59,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:01:59,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:00,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:02:00,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:00,889 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:02:00,889 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:02:00,889 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [775343847] [2021-05-02 19:02:00,889 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [775343847] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:02:00,889 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1240599738] [2021-05-02 19:02:00,889 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 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:02:00,948 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 19:02:00,948 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:02:00,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 115 conjunts are in the unsatisfiable core [2021-05-02 19:02:00,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:02:01,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:02:01,168 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:02:01,168 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1240599738] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:02:01,168 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:02:01,168 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 59] total 61 [2021-05-02 19:02:01,168 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [17895152] [2021-05-02 19:02:01,168 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2021-05-02 19:02:01,168 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:02:01,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-05-02 19:02:01,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=3484, Unknown=0, NotChecked=0, Total=3660 [2021-05-02 19:02:01,169 INFO L87 Difference]: Start difference. First operand 134 states and 138 transitions. Second operand has 61 states, 61 states have (on average 2.0655737704918034) internal successors, (126), 60 states have internal predecessors, (126), 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 19:02:05,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:02:05,390 INFO L93 Difference]: Finished difference Result 144 states and 151 transitions. [2021-05-02 19:02:05,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-05-02 19:02:05,390 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.0655737704918034) internal successors, (126), 60 states have internal predecessors, (126), 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 127 [2021-05-02 19:02:05,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:02:05,391 INFO L225 Difference]: With dead ends: 144 [2021-05-02 19:02:05,391 INFO L226 Difference]: Without dead ends: 144 [2021-05-02 19:02:05,391 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 129 SyntacticMatches, 1 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1600 ImplicationChecksByTransitivity, 3171.4ms TimeCoverageRelationStatistics Valid=461, Invalid=13345, Unknown=0, NotChecked=0, Total=13806 [2021-05-02 19:02:05,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-05-02 19:02:05,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 136. [2021-05-02 19:02:05,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 130 states have (on average 1.0384615384615385) internal successors, (135), 130 states have internal predecessors, (135), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 19:02:05,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 140 transitions. [2021-05-02 19:02:05,393 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 140 transitions. Word has length 127 [2021-05-02 19:02:05,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:02:05,393 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 140 transitions. [2021-05-02 19:02:05,393 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 61 states, 61 states have (on average 2.0655737704918034) internal successors, (126), 60 states have internal predecessors, (126), 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 19:02:05,394 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 140 transitions. [2021-05-02 19:02:05,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-05-02 19:02:05,394 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:02:05,394 INFO L523 BasicCegarLoop]: trace histogram [57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:02:05,612 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-05-02 19:02:05,612 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:02:05,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:02:05,613 INFO L82 PathProgramCache]: Analyzing trace with hash -2046946279, now seen corresponding path program 57 times [2021-05-02 19:02:05,613 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:02:05,613 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1284182489] [2021-05-02 19:02:05,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:02:05,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:06,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:02:06,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:06,906 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 0 proven. 3249 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:02:06,906 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:02:06,906 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1284182489] [2021-05-02 19:02:06,906 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1284182489] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:02:06,906 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1286984943] [2021-05-02 19:02:06,907 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 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:02:09,974 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 58 check-sat command(s) [2021-05-02 19:02:09,974 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:02:09,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 134 conjunts are in the unsatisfiable core [2021-05-02 19:02:09,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:02:10,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:02:10,980 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 0 proven. 3249 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:02:10,981 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1286984943] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:02:10,981 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:02:10,981 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 60] total 62 [2021-05-02 19:02:10,981 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304427839] [2021-05-02 19:02:10,981 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-02 19:02:10,981 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:02:10,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-02 19:02:10,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=3603, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 19:02:10,982 INFO L87 Difference]: Start difference. First operand 136 states and 140 transitions. Second operand has 62 states, 62 states have (on average 2.064516129032258) internal successors, (128), 61 states have internal predecessors, (128), 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 19:02:16,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:02:16,576 INFO L93 Difference]: Finished difference Result 146 states and 153 transitions. [2021-05-02 19:02:16,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-05-02 19:02:16,576 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.064516129032258) internal successors, (128), 61 states have internal predecessors, (128), 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 129 [2021-05-02 19:02:16,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:02:16,577 INFO L225 Difference]: With dead ends: 146 [2021-05-02 19:02:16,577 INFO L226 Difference]: Without dead ends: 146 [2021-05-02 19:02:16,577 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 114 SyntacticMatches, 18 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1691 ImplicationChecksByTransitivity, 4531.8ms TimeCoverageRelationStatistics Valid=469, Invalid=13811, Unknown=0, NotChecked=0, Total=14280 [2021-05-02 19:02:16,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-05-02 19:02:16,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 138. [2021-05-02 19:02:16,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 132 states have (on average 1.0378787878787878) internal successors, (137), 132 states have internal predecessors, (137), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 19:02:16,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 142 transitions. [2021-05-02 19:02:16,579 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 142 transitions. Word has length 129 [2021-05-02 19:02:16,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:02:16,579 INFO L480 AbstractCegarLoop]: Abstraction has 138 states and 142 transitions. [2021-05-02 19:02:16,579 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 62 states, 62 states have (on average 2.064516129032258) internal successors, (128), 61 states have internal predecessors, (128), 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 19:02:16,579 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 142 transitions. [2021-05-02 19:02:16,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-02 19:02:16,580 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:02:16,580 INFO L523 BasicCegarLoop]: trace histogram [58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:02:16,780 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58,58 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:02:16,780 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:02:16,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:02:16,780 INFO L82 PathProgramCache]: Analyzing trace with hash 891044471, now seen corresponding path program 58 times [2021-05-02 19:02:16,780 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:02:16,781 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1291899943] [2021-05-02 19:02:16,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:02:16,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:18,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:02:18,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:18,552 INFO L134 CoverageAnalysis]: Checked inductivity of 3364 backedges. 0 proven. 3364 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:02:18,552 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:02:18,552 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1291899943] [2021-05-02 19:02:18,552 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1291899943] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:02:18,552 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1389776397] [2021-05-02 19:02:18,552 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 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:02:18,608 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 19:02:18,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:02:18,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 119 conjunts are in the unsatisfiable core [2021-05-02 19:02:18,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:02:18,845 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:02:18,852 INFO L134 CoverageAnalysis]: Checked inductivity of 3364 backedges. 0 proven. 3364 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:02:18,852 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1389776397] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:02:18,852 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:02:18,852 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 61] total 63 [2021-05-02 19:02:18,852 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1274199402] [2021-05-02 19:02:18,852 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2021-05-02 19:02:18,852 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:02:18,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-05-02 19:02:18,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=3724, Unknown=0, NotChecked=0, Total=3906 [2021-05-02 19:02:18,853 INFO L87 Difference]: Start difference. First operand 138 states and 142 transitions. Second operand has 63 states, 63 states have (on average 2.0634920634920637) internal successors, (130), 62 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 19:02:24,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:02:25,000 INFO L93 Difference]: Finished difference Result 148 states and 155 transitions. [2021-05-02 19:02:25,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-05-02 19:02:25,000 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 2.0634920634920637) internal successors, (130), 62 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 131 [2021-05-02 19:02:25,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:02:25,001 INFO L225 Difference]: With dead ends: 148 [2021-05-02 19:02:25,001 INFO L226 Difference]: Without dead ends: 148 [2021-05-02 19:02:25,002 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1715 ImplicationChecksByTransitivity, 4632.2ms TimeCoverageRelationStatistics Valid=477, Invalid=14285, Unknown=0, NotChecked=0, Total=14762 [2021-05-02 19:02:25,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-05-02 19:02:25,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 140. [2021-05-02 19:02:25,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 134 states have (on average 1.037313432835821) internal successors, (139), 134 states have internal predecessors, (139), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 19:02:25,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 144 transitions. [2021-05-02 19:02:25,003 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 144 transitions. Word has length 131 [2021-05-02 19:02:25,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:02:25,003 INFO L480 AbstractCegarLoop]: Abstraction has 140 states and 144 transitions. [2021-05-02 19:02:25,004 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 63 states, 63 states have (on average 2.0634920634920637) internal successors, (130), 62 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 19:02:25,004 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 144 transitions. [2021-05-02 19:02:25,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-05-02 19:02:25,004 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:02:25,004 INFO L523 BasicCegarLoop]: trace histogram [59, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:02:25,212 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-05-02 19:02:25,213 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:02:25,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:02:25,213 INFO L82 PathProgramCache]: Analyzing trace with hash -1788325547, now seen corresponding path program 59 times [2021-05-02 19:02:25,213 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:02:25,213 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [237697295] [2021-05-02 19:02:25,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:02:25,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:27,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:02:27,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:27,117 INFO L134 CoverageAnalysis]: Checked inductivity of 3481 backedges. 0 proven. 3481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:02:27,117 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:02:27,117 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [237697295] [2021-05-02 19:02:27,117 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [237697295] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:02:27,118 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [128168516] [2021-05-02 19:02:27,118 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 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true