/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/phases_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 12:18:52,194 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 12:18:52,195 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 12:18:52,218 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 12:18:52,240 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 12:18:52,242 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 12:18:52,243 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 12:18:52,245 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 12:18:52,246 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 12:18:52,246 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 12:18:52,249 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 12:18:52,251 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 12:18:52,252 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 12:18:52,253 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 12:18:52,254 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 12:18:52,254 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 12:18:52,255 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 12:18:52,267 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 12:18:52,268 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 12:18:52,268 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 12:18:52,269 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 12:18:52,284 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 12:18:52,284 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 12:18:52,285 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 12:18:52,285 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 12:18:52,285 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 12:18:52,286 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 12:18:52,286 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 12:18:52,286 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 12:18:52,286 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 12:18:52,286 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 12:18:52,286 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 12:18:52,286 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 12:18:52,286 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 12:18:52,286 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 12:18:52,287 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 12:18:52,287 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 12:18:52,287 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 12:18:52,287 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 12:18:52,287 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 12:18:52,287 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 12:18:52,287 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 12:18:52,287 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 12:18:52,287 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 12:18:52,287 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 12:18:52,288 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 12:18:52,288 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 12:18:52,288 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 12:18:52,288 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 12:18:52,288 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 12:18:52,557 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 12:18:52,571 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 12:18:52,572 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 12:18:52,573 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 12:18:52,574 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 12:18:52,574 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/phases_1-2.c [2021-05-02 12:18:52,613 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0f10c3a4a/70e0f144070b4c3189b63476a8ec06da/FLAG33fd9b4ff [2021-05-02 12:18:52,963 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 12:18:52,964 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/phases_1-2.c [2021-05-02 12:18:52,968 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0f10c3a4a/70e0f144070b4c3189b63476a8ec06da/FLAG33fd9b4ff [2021-05-02 12:18:52,982 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0f10c3a4a/70e0f144070b4c3189b63476a8ec06da [2021-05-02 12:18:52,984 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 12:18:52,986 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 12:18:52,988 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 12:18:52,988 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 12:18:52,991 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 12:18:52,991 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:18:52" (1/1) ... [2021-05-02 12:18:52,992 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@79403268 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:18:52, skipping insertion in model container [2021-05-02 12:18:52,992 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:18:52" (1/1) ... [2021-05-02 12:18:52,997 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 12:18:53,007 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 12:18:53,097 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/phases_1-2.c[322,335] [2021-05-02 12:18:53,104 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:18:53,113 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 12:18:53,120 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/phases_1-2.c[322,335] [2021-05-02 12:18:53,122 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:18:53,135 INFO L208 MainTranslator]: Completed translation [2021-05-02 12:18:53,136 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:18:53 WrapperNode [2021-05-02 12:18:53,136 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 12:18:53,137 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 12:18:53,137 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 12:18:53,137 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 12:18:53,143 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:18:53" (1/1) ... [2021-05-02 12:18:53,143 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:18:53" (1/1) ... [2021-05-02 12:18:53,147 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:18:53" (1/1) ... [2021-05-02 12:18:53,147 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:18:53" (1/1) ... [2021-05-02 12:18:53,150 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:18:53" (1/1) ... [2021-05-02 12:18:53,182 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:18:53" (1/1) ... [2021-05-02 12:18:53,183 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:18:53" (1/1) ... [2021-05-02 12:18:53,184 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 12:18:53,185 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 12:18:53,185 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 12:18:53,185 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 12:18:53,186 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:18:53" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 12:18:53,247 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 12:18:53,248 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 12:18:53,248 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 12:18:53,248 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 12:18:53,248 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 12:18:53,248 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 12:18:53,248 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 12:18:53,249 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 12:18:53,249 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 12:18:53,249 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 12:18:53,249 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 12:18:53,249 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 12:18:53,249 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 12:18:53,250 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 12:18:53,250 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 12:18:53,250 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 12:18:53,250 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 12:18:53,431 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 12:18:53,431 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 12:18:53,432 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:18:53 BoogieIcfgContainer [2021-05-02 12:18:53,432 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 12:18:53,433 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 12:18:53,433 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 12:18:53,435 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 12:18:53,435 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 12:18:52" (1/3) ... [2021-05-02 12:18:53,436 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@13b3649b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:18:53, skipping insertion in model container [2021-05-02 12:18:53,436 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:18:53" (2/3) ... [2021-05-02 12:18:53,436 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@13b3649b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:18:53, skipping insertion in model container [2021-05-02 12:18:53,436 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:18:53" (3/3) ... [2021-05-02 12:18:53,437 INFO L111 eAbstractionObserver]: Analyzing ICFG phases_1-2.c [2021-05-02 12:18:53,441 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 12:18:53,443 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 12:18:53,467 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 12:18:53,513 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 12:18:53,513 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 12:18:53,513 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 12:18:53,513 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 12:18:53,514 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 12:18:53,514 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 12:18:53,514 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 12:18:53,514 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 12:18:53,524 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 12:18:53,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 12:18:53,527 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:18:53,527 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:18:53,527 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:18:53,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:18:53,531 INFO L82 PathProgramCache]: Analyzing trace with hash 491760044, now seen corresponding path program 1 times [2021-05-02 12:18:53,536 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:18:53,537 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2124321620] [2021-05-02 12:18:53,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:18:53,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:53,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:18:53,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:53,683 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:18:53,684 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:18:53,684 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2124321620] [2021-05-02 12:18:53,685 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2124321620] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:18:53,685 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:18:53,685 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 12:18:53,686 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058061528] [2021-05-02 12:18:53,689 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 12:18:53,690 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:18:53,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 12:18:53,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 12:18:53,706 INFO L87 Difference]: Start difference. First operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:53,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:18:53,767 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2021-05-02 12:18:53,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 12:18:53,769 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 12:18:53,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:18:53,775 INFO L225 Difference]: With dead ends: 30 [2021-05-02 12:18:53,775 INFO L226 Difference]: Without dead ends: 13 [2021-05-02 12:18:53,779 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 35.3ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 12:18:53,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-05-02 12:18:53,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-05-02 12:18:53,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:53,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-05-02 12:18:53,808 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2021-05-02 12:18:53,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:18:53,808 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-05-02 12:18:53,809 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:53,809 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-05-02 12:18:53,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 12:18:53,810 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:18:53,810 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:18:53,810 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 12:18:53,811 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:18:53,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:18:53,814 INFO L82 PathProgramCache]: Analyzing trace with hash 482524834, now seen corresponding path program 1 times [2021-05-02 12:18:53,814 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:18:53,814 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1048376731] [2021-05-02 12:18:53,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:18:53,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:53,936 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:18:53,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:53,958 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:18:53,959 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:18:53,959 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1048376731] [2021-05-02 12:18:53,960 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1048376731] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:18:53,960 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:18:53,960 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 12:18:53,961 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1647406523] [2021-05-02 12:18:53,962 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 12:18:53,962 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:18:53,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 12:18:53,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 12:18:53,966 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:54,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:18:54,029 INFO L93 Difference]: Finished difference Result 22 states and 26 transitions. [2021-05-02 12:18:54,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 12:18:54,030 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 12:18:54,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:18:54,031 INFO L225 Difference]: With dead ends: 22 [2021-05-02 12:18:54,031 INFO L226 Difference]: Without dead ends: 15 [2021-05-02 12:18:54,032 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 53.8ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 12:18:54,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-02 12:18:54,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-05-02 12:18:54,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:54,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-05-02 12:18:54,042 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2021-05-02 12:18:54,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:18:54,043 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-05-02 12:18:54,043 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:54,043 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-05-02 12:18:54,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 12:18:54,044 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:18:54,044 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:18:54,044 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 12:18:54,044 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:18:54,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:18:54,045 INFO L82 PathProgramCache]: Analyzing trace with hash 925229631, now seen corresponding path program 1 times [2021-05-02 12:18:54,045 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:18:54,045 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [247619438] [2021-05-02 12:18:54,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:18:54,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:54,152 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:18:54,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:54,174 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:18:54,175 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:18:54,175 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [247619438] [2021-05-02 12:18:54,175 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [247619438] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:54,175 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1641409735] [2021-05-02 12:18:54,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:54,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:54,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 12:18:54,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:18:54,258 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:18:54,259 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1641409735] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:54,259 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:18:54,259 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 12:18:54,259 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618785498] [2021-05-02 12:18:54,259 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 12:18:54,259 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:18:54,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 12:18:54,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 12:18:54,260 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:54,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:18:54,334 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2021-05-02 12:18:54,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 12:18:54,335 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 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 13 [2021-05-02 12:18:54,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:18:54,335 INFO L225 Difference]: With dead ends: 24 [2021-05-02 12:18:54,335 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 12:18:54,336 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 80.4ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:18:54,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 12:18:54,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 12:18:54,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:54,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-05-02 12:18:54,339 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2021-05-02 12:18:54,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:18:54,339 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-05-02 12:18:54,339 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:54,339 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-05-02 12:18:54,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 12:18:54,340 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:18:54,340 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:18:54,557 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 12:18:54,557 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:18:54,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:18:54,558 INFO L82 PathProgramCache]: Analyzing trace with hash 1162777244, now seen corresponding path program 2 times [2021-05-02 12:18:54,558 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:18:54,558 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1299933264] [2021-05-02 12:18:54,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:18:54,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:54,650 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:18:54,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:54,673 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 12:18:54,673 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:18:54,673 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1299933264] [2021-05-02 12:18:54,673 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1299933264] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:54,673 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1678363384] [2021-05-02 12:18:54,674 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:54,717 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:18:54,718 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:18:54,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 12:18:54,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:18:54,776 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:18:54,797 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 12:18:54,797 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1678363384] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:54,797 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:18:54,797 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 12:18:54,798 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1279270574] [2021-05-02 12:18:54,798 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 12:18:54,798 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:18:54,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 12:18:54,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 12:18:54,801 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:54,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:18:54,917 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2021-05-02 12:18:54,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 12:18:54,917 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 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 15 [2021-05-02 12:18:54,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:18:54,919 INFO L225 Difference]: With dead ends: 26 [2021-05-02 12:18:54,919 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 12:18:54,920 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 133.0ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:18:54,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 12:18:54,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-02 12:18:54,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:54,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-02 12:18:54,926 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2021-05-02 12:18:54,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:18:54,926 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-02 12:18:54,926 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:54,926 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-02 12:18:54,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 12:18:54,927 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:18:54,927 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:18:55,141 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:55,142 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:18:55,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:18:55,142 INFO L82 PathProgramCache]: Analyzing trace with hash 1812766649, now seen corresponding path program 3 times [2021-05-02 12:18:55,142 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:18:55,142 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1346959960] [2021-05-02 12:18:55,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:18:55,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:55,218 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:18:55,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:55,222 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 12:18:55,222 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:18:55,222 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1346959960] [2021-05-02 12:18:55,222 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1346959960] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:55,222 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1985032770] [2021-05-02 12:18:55,222 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) [2021-05-02 12:18:55,258 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 12:18:55,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:18:55,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 4 conjunts are in the unsatisfiable core Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:55,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:18:55,288 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:18:55,300 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 12:18:55,301 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1985032770] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:18:55,301 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 12:18:55,301 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [7] total 8 [2021-05-02 12:18:55,301 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917808245] [2021-05-02 12:18:55,301 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 12:18:55,301 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:18:55,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 12:18:55,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:18:55,302 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:55,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:18:55,310 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2021-05-02 12:18:55,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 12:18:55,311 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 12:18:55,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:18:55,311 INFO L225 Difference]: With dead ends: 26 [2021-05-02 12:18:55,311 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 12:18:55,311 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 44.4ms TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:18:55,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 12:18:55,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2021-05-02 12:18:55,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:55,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-05-02 12:18:55,314 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2021-05-02 12:18:55,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:18:55,314 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-05-02 12:18:55,314 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:55,314 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-05-02 12:18:55,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 12:18:55,314 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:18:55,315 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:18:55,530 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:55,530 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:18:55,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:18:55,531 INFO L82 PathProgramCache]: Analyzing trace with hash -555382060, now seen corresponding path program 1 times [2021-05-02 12:18:55,531 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:18:55,531 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1936642314] [2021-05-02 12:18:55,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:18:55,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:55,591 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:18:55,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:55,595 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:18:55,595 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:18:55,596 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1936642314] [2021-05-02 12:18:55,596 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1936642314] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:55,596 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [641268025] [2021-05-02 12:18:55,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-05-02 12:18:55,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:55,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 10 conjunts are in the unsatisfiable core Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:55,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:18:55,697 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:18:55,706 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:18:55,718 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:18:55,718 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [641268025] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:55,718 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:18:55,718 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 12:18:55,719 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802950509] [2021-05-02 12:18:55,720 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 12:18:55,720 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:18:55,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 12:18:55,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:18:55,720 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:55,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:18:55,881 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2021-05-02 12:18:55,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 12:18:55,881 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (4), 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 12:18:55,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:18:55,882 INFO L225 Difference]: With dead ends: 30 [2021-05-02 12:18:55,882 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 12:18:55,882 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 151.8ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:18:55,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 12:18:55,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-05-02 12:18:55,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:55,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-05-02 12:18:55,885 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 19 [2021-05-02 12:18:55,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:18:55,886 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-05-02 12:18:55,886 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:55,886 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-05-02 12:18:55,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 12:18:55,886 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:18:55,886 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:18:56,100 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:56,101 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:18:56,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:18:56,101 INFO L82 PathProgramCache]: Analyzing trace with hash 795722097, now seen corresponding path program 2 times [2021-05-02 12:18:56,101 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:18:56,102 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2095967164] [2021-05-02 12:18:56,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:18:56,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:56,173 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:18:56,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:56,177 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:18:56,177 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:18:56,177 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2095967164] [2021-05-02 12:18:56,177 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2095967164] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:56,177 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2142244751] [2021-05-02 12:18:56,177 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:56,221 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:18:56,221 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:18:56,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 12:18:56,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:18:56,279 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:18:56,290 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 12:18:56,290 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2142244751] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:56,290 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:18:56,290 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2021-05-02 12:18:56,290 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143534482] [2021-05-02 12:18:56,291 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 12:18:56,291 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:18:56,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 12:18:56,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:18:56,291 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:56,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:18:56,491 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2021-05-02 12:18:56,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 12:18:56,491 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 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 21 [2021-05-02 12:18:56,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:18:56,492 INFO L225 Difference]: With dead ends: 32 [2021-05-02 12:18:56,492 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 12:18:56,493 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 176.1ms TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-05-02 12:18:56,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 12:18:56,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-05-02 12:18:56,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:56,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-05-02 12:18:56,501 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 21 [2021-05-02 12:18:56,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:18:56,501 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-05-02 12:18:56,501 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:56,501 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-05-02 12:18:56,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 12:18:56,502 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:18:56,502 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:18:56,708 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 12:18:56,709 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:18:56,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:18:56,709 INFO L82 PathProgramCache]: Analyzing trace with hash 2126693582, now seen corresponding path program 3 times [2021-05-02 12:18:56,709 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:18:56,709 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1727344017] [2021-05-02 12:18:56,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:18:56,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:56,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:18:56,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:56,803 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:18:56,803 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:18:56,803 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1727344017] [2021-05-02 12:18:56,803 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1727344017] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:56,803 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1708867110] [2021-05-02 12:18:56,803 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:56,841 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 12:18:56,841 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:18:56,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 12:18:56,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:18:56,887 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:18:56,893 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 12:18:56,893 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1708867110] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:56,893 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:18:56,893 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 4] total 11 [2021-05-02 12:18:56,894 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048196231] [2021-05-02 12:18:56,894 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 12:18:56,894 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:18:56,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 12:18:56,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:18:56,894 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:57,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:18:57,253 INFO L93 Difference]: Finished difference Result 39 states and 46 transitions. [2021-05-02 12:18:57,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 12:18:57,253 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-02 12:18:57,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:18:57,254 INFO L225 Difference]: With dead ends: 39 [2021-05-02 12:18:57,254 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 12:18:57,254 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 324.2ms TimeCoverageRelationStatistics Valid=95, Invalid=285, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:18:57,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 12:18:57,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2021-05-02 12:18:57,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:57,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-05-02 12:18:57,260 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 23 [2021-05-02 12:18:57,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:18:57,260 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-05-02 12:18:57,260 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:57,260 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-05-02 12:18:57,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 12:18:57,261 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:18:57,261 INFO L523 BasicCegarLoop]: trace histogram [8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:18:57,478 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:57,479 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:18:57,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:18:57,479 INFO L82 PathProgramCache]: Analyzing trace with hash -387921018, now seen corresponding path program 4 times [2021-05-02 12:18:57,479 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:18:57,479 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1086273304] [2021-05-02 12:18:57,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:18:57,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:57,576 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:18:57,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:57,581 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:18:57,581 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:18:57,581 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1086273304] [2021-05-02 12:18:57,592 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1086273304] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:57,593 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [314922154] [2021-05-02 12:18:57,593 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:57,631 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:18:57,631 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:18:57,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 12:18:57,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:18:57,699 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:18:57,701 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:18:57,715 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:18:57,715 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [314922154] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:57,715 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:18:57,715 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 12:18:57,715 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [914868463] [2021-05-02 12:18:57,715 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 12:18:57,715 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:18:57,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 12:18:57,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:18:57,716 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:57,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:18:57,946 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2021-05-02 12:18:57,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 12:18:57,946 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 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 12:18:57,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:18:57,947 INFO L225 Difference]: With dead ends: 40 [2021-05-02 12:18:57,947 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 12:18:57,947 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 204.1ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:18:57,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 12:18:57,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-02 12:18:57,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.12) internal successors, (28), 25 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:57,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2021-05-02 12:18:57,951 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2021-05-02 12:18:57,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:18:57,951 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2021-05-02 12:18:57,951 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:57,951 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2021-05-02 12:18:57,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 12:18:57,951 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:18:57,952 INFO L523 BasicCegarLoop]: trace histogram [9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:18:58,166 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:58,167 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:18:58,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:18:58,167 INFO L82 PathProgramCache]: Analyzing trace with hash -1899293405, now seen corresponding path program 5 times [2021-05-02 12:18:58,167 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:18:58,167 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1262710973] [2021-05-02 12:18:58,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:18:58,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:58,273 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:18:58,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:58,281 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:18:58,281 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:18:58,281 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1262710973] [2021-05-02 12:18:58,281 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1262710973] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:58,281 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1993393683] [2021-05-02 12:18:58,281 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:58,329 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-05-02 12:18:58,330 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:18:58,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 12:18:58,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:18:58,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:18:58,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:18:58,445 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:18:58,445 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1993393683] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:58,445 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:18:58,445 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 12:18:58,446 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1758150754] [2021-05-02 12:18:58,446 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 12:18:58,446 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:18:58,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 12:18:58,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:18:58,448 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:58,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:18:58,714 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2021-05-02 12:18:58,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 12:18:58,714 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 2 states have call successors, (4), 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 12:18:58,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:18:58,715 INFO L225 Difference]: With dead ends: 42 [2021-05-02 12:18:58,715 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 12:18:58,715 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 27 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 270.1ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:18:58,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 12:18:58,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 12:18:58,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 27 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:58,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2021-05-02 12:18:58,718 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2021-05-02 12:18:58,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:18:58,719 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2021-05-02 12:18:58,719 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:58,719 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2021-05-02 12:18:58,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 12:18:58,719 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:18:58,719 INFO L523 BasicCegarLoop]: trace histogram [10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:18:58,934 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 12:18:58,935 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:18:58,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:18:58,935 INFO L82 PathProgramCache]: Analyzing trace with hash 1665756032, now seen corresponding path program 6 times [2021-05-02 12:18:58,935 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:18:58,935 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1167882558] [2021-05-02 12:18:58,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:18:58,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:59,048 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:18:59,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:59,053 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 27 proven. 72 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:18:59,053 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:18:59,053 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1167882558] [2021-05-02 12:18:59,053 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1167882558] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:59,053 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1008996813] [2021-05-02 12:18:59,053 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:59,156 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2021-05-02 12:18:59,156 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:18:59,157 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 12:18:59,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:18:59,243 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 27 proven. 72 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:18:59,243 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1008996813] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:59,243 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:18:59,244 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 12:18:59,244 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700087443] [2021-05-02 12:18:59,244 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 12:18:59,244 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:18:59,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 12:18:59,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:18:59,245 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:59,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:18:59,605 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2021-05-02 12:18:59,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 12:18:59,606 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 states have internal predecessors, (31), 2 states have call successors, (4), 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 12:18:59,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:18:59,606 INFO L225 Difference]: With dead ends: 44 [2021-05-02 12:18:59,606 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 12:18:59,607 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 30 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 322.4ms TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:18:59,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 12:18:59,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 12:18:59,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.103448275862069) internal successors, (32), 29 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:59,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2021-05-02 12:18:59,610 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2021-05-02 12:18:59,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:18:59,610 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2021-05-02 12:18:59,610 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:59,610 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2021-05-02 12:18:59,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 12:18:59,611 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:18:59,611 INFO L523 BasicCegarLoop]: trace histogram [11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:18:59,818 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:59,818 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:18:59,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:18:59,818 INFO L82 PathProgramCache]: Analyzing trace with hash 294362781, now seen corresponding path program 7 times [2021-05-02 12:18:59,819 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:18:59,819 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1768237130] [2021-05-02 12:18:59,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:18:59,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:59,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:18:59,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:59,930 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:18:59,930 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:18:59,930 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1768237130] [2021-05-02 12:18:59,930 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1768237130] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:59,930 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1828469885] [2021-05-02 12:18:59,930 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:59,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:59,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 12:18:59,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:00,039 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:00,041 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:00,049 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:19:00,049 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1828469885] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:00,049 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:00,049 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 12:19:00,050 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133483006] [2021-05-02 12:19:00,050 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 12:19:00,050 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:00,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 12:19:00,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:19:00,050 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:00,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:00,417 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2021-05-02 12:19:00,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 12:19:00,419 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 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 12:19:00,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:00,421 INFO L225 Difference]: With dead ends: 46 [2021-05-02 12:19:00,421 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 12:19:00,421 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 306.6ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:19:00,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 12:19:00,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-02 12:19:00,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.096774193548387) internal successors, (34), 31 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:00,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2021-05-02 12:19:00,432 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2021-05-02 12:19:00,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:00,432 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2021-05-02 12:19:00,432 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:00,432 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2021-05-02 12:19:00,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 12:19:00,435 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:00,435 INFO L523 BasicCegarLoop]: trace histogram [12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:00,648 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:00,649 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:00,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:00,649 INFO L82 PathProgramCache]: Analyzing trace with hash 940408442, now seen corresponding path program 8 times [2021-05-02 12:19:00,649 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:00,650 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1811471573] [2021-05-02 12:19:00,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:00,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:00,788 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:00,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:00,793 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 33 proven. 110 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:19:00,793 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:00,793 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1811471573] [2021-05-02 12:19:00,793 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1811471573] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:00,793 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1895831049] [2021-05-02 12:19:00,793 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 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:00,855 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:19:00,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:00,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 12:19:00,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:00,956 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:00,963 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 12:19:00,963 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1895831049] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:00,963 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:00,963 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15] total 17 [2021-05-02 12:19:00,963 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320862992] [2021-05-02 12:19:00,964 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 12:19:00,964 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:00,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 12:19:00,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2021-05-02 12:19:00,964 INFO L87 Difference]: Start difference. First operand 36 states and 38 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 12:19:01,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:01,401 INFO L93 Difference]: Finished difference Result 48 states and 53 transitions. [2021-05-02 12:19:01,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 12:19:01,402 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 35 [2021-05-02 12:19:01,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:01,402 INFO L225 Difference]: With dead ends: 48 [2021-05-02 12:19:01,402 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 12:19:01,403 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 407.3ms TimeCoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:19:01,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 12:19:01,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-05-02 12:19:01,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 33 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:01,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2021-05-02 12:19:01,406 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2021-05-02 12:19:01,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:01,406 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2021-05-02 12:19:01,406 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 12:19:01,406 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2021-05-02 12:19:01,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 12:19:01,407 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:01,407 INFO L523 BasicCegarLoop]: trace histogram [13, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:01,622 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 12:19:01,623 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:01,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:01,623 INFO L82 PathProgramCache]: Analyzing trace with hash -979969257, now seen corresponding path program 9 times [2021-05-02 12:19:01,623 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:01,623 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [361607363] [2021-05-02 12:19:01,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:01,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:01,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:01,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:01,814 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 36 proven. 132 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:19:01,814 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:01,814 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [361607363] [2021-05-02 12:19:01,814 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [361607363] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:01,814 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [305345006] [2021-05-02 12:19:01,815 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:01,877 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-05-02 12:19:01,877 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:01,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 12:19:01,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:01,959 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:01,964 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 55 proven. 4 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-05-02 12:19:01,964 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [305345006] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:01,964 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:01,964 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 5] total 18 [2021-05-02 12:19:01,964 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324157379] [2021-05-02 12:19:01,965 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 12:19:01,965 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:01,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 12:19:01,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=238, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:19:01,966 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:02,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:02,629 INFO L93 Difference]: Finished difference Result 55 states and 64 transitions. [2021-05-02 12:19:02,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 12:19:02,629 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2021-05-02 12:19:02,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:02,631 INFO L225 Difference]: With dead ends: 55 [2021-05-02 12:19:02,631 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 12:19:02,632 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 631.5ms TimeCoverageRelationStatistics Valid=215, Invalid=907, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 12:19:02,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 12:19:02,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2021-05-02 12:19:02,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 37 states have (on average 1.1081081081081081) internal successors, (41), 37 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:02,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2021-05-02 12:19:02,635 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 37 [2021-05-02 12:19:02,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:02,635 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2021-05-02 12:19:02,635 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:02,635 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2021-05-02 12:19:02,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 12:19:02,636 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:02,636 INFO L523 BasicCegarLoop]: trace histogram [15, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:02,838 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 12:19:02,839 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:02,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:02,839 INFO L82 PathProgramCache]: Analyzing trace with hash -1192350513, now seen corresponding path program 10 times [2021-05-02 12:19:02,839 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:02,839 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1130345906] [2021-05-02 12:19:02,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:02,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:03,027 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:03,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:03,033 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 65 proven. 156 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 12:19:03,033 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:03,033 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1130345906] [2021-05-02 12:19:03,033 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1130345906] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:03,033 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [413864215] [2021-05-02 12:19:03,033 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:03,073 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:19:03,073 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:03,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 12:19:03,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:03,169 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:03,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:03,180 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 65 proven. 156 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 12:19:03,181 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [413864215] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:03,181 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:03,181 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 12:19:03,181 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969355672] [2021-05-02 12:19:03,182 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 12:19:03,182 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:03,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 12:19:03,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 12:19:03,182 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:03,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:03,715 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2021-05-02 12:19:03,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 12:19:03,716 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-02 12:19:03,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:03,716 INFO L225 Difference]: With dead ends: 56 [2021-05-02 12:19:03,716 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 12:19:03,717 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 467.6ms TimeCoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2021-05-02 12:19:03,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 12:19:03,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-05-02 12:19:03,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 39 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:03,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2021-05-02 12:19:03,720 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 41 [2021-05-02 12:19:03,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:03,720 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2021-05-02 12:19:03,720 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:03,720 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2021-05-02 12:19:03,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 12:19:03,721 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:03,721 INFO L523 BasicCegarLoop]: trace histogram [16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:03,947 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 12:19:03,947 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:03,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:03,948 INFO L82 PathProgramCache]: Analyzing trace with hash 1781850028, now seen corresponding path program 11 times [2021-05-02 12:19:03,948 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:03,948 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [912038694] [2021-05-02 12:19:03,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:03,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:04,155 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:04,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:04,166 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 70 proven. 182 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 12:19:04,167 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:04,167 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [912038694] [2021-05-02 12:19:04,167 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [912038694] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:04,167 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1484491274] [2021-05-02 12:19:04,167 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:04,573 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2021-05-02 12:19:04,573 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:04,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 12:19:04,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:04,783 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:04,787 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:04,832 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 70 proven. 182 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 12:19:04,832 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1484491274] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:04,832 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:04,832 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 12:19:04,832 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722791364] [2021-05-02 12:19:04,832 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 12:19:04,832 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:04,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 12:19:04,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:19:04,833 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:05,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:05,402 INFO L93 Difference]: Finished difference Result 58 states and 65 transitions. [2021-05-02 12:19:05,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 12:19:05,402 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 2 states have call successors, (4), 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 12:19:05,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:05,403 INFO L225 Difference]: With dead ends: 58 [2021-05-02 12:19:05,403 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 12:19:05,403 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 32 SyntacticMatches, 13 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 634.6ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-02 12:19:05,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 12:19:05,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2021-05-02 12:19:05,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.0975609756097562) internal successors, (45), 41 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:05,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2021-05-02 12:19:05,407 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 43 [2021-05-02 12:19:05,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:05,407 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2021-05-02 12:19:05,407 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:05,407 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2021-05-02 12:19:05,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 12:19:05,407 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:05,407 INFO L523 BasicCegarLoop]: trace histogram [17, 14, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:05,610 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:05,611 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:05,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:05,611 INFO L82 PathProgramCache]: Analyzing trace with hash -459649207, now seen corresponding path program 12 times [2021-05-02 12:19:05,611 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:05,611 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [445199106] [2021-05-02 12:19:05,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:05,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:05,865 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:05,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:05,895 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 75 proven. 210 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 12:19:05,895 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:05,896 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [445199106] [2021-05-02 12:19:05,896 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [445199106] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:05,896 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1032076116] [2021-05-02 12:19:05,896 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:06,275 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2021-05-02 12:19:06,276 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:06,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 12:19:06,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:06,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:06,568 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 98 proven. 9 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2021-05-02 12:19:06,568 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1032076116] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:06,568 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:06,568 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 6] total 22 [2021-05-02 12:19:06,569 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885668511] [2021-05-02 12:19:06,569 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 12:19:06,569 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:06,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 12:19:06,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:19:06,569 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:07,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:07,592 INFO L93 Difference]: Finished difference Result 63 states and 73 transitions. [2021-05-02 12:19:07,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 12:19:07,593 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 2 states have call successors, (4), 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 12:19:07,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:07,593 INFO L225 Difference]: With dead ends: 63 [2021-05-02 12:19:07,593 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 12:19:07,594 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 44 SyntacticMatches, 3 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 1000.9ms TimeCoverageRelationStatistics Valid=199, Invalid=1441, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 12:19:07,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 12:19:07,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-05-02 12:19:07,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.065217391304348) internal successors, (49), 46 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:07,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2021-05-02 12:19:07,597 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 45 [2021-05-02 12:19:07,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:07,597 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2021-05-02 12:19:07,597 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:07,597 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2021-05-02 12:19:07,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 12:19:07,598 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:07,598 INFO L523 BasicCegarLoop]: trace histogram [19, 15, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:07,801 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 12:19:07,801 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:07,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:07,801 INFO L82 PathProgramCache]: Analyzing trace with hash 1333784449, now seen corresponding path program 13 times [2021-05-02 12:19:07,802 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:07,802 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60896283] [2021-05-02 12:19:07,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:07,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:08,017 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:08,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:08,025 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 112 proven. 240 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 12:19:08,025 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:08,025 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60896283] [2021-05-02 12:19:08,025 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [60896283] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:08,025 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [57203946] [2021-05-02 12:19:08,025 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:08,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:08,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 12:19:08,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:08,221 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:08,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:08,238 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 112 proven. 240 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 12:19:08,239 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [57203946] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:08,239 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:08,239 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 12:19:08,239 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462186439] [2021-05-02 12:19:08,239 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 12:19:08,239 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:08,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 12:19:08,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:19:08,240 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand has 20 states, 20 states have (on average 2.25) internal successors, (45), 19 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:08,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:08,939 INFO L93 Difference]: Finished difference Result 68 states and 73 transitions. [2021-05-02 12:19:08,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 12:19:08,939 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 19 states have internal predecessors, (45), 2 states have call successors, (4), 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 12:19:08,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:08,940 INFO L225 Difference]: With dead ends: 68 [2021-05-02 12:19:08,940 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 12:19:08,940 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 571.1ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 12:19:08,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 12:19:08,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-05-02 12:19:08,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0625) internal successors, (51), 48 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:08,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2021-05-02 12:19:08,944 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 49 [2021-05-02 12:19:08,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:08,944 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2021-05-02 12:19:08,944 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 19 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:08,944 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2021-05-02 12:19:08,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 12:19:08,946 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:08,946 INFO L523 BasicCegarLoop]: trace histogram [20, 16, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:09,158 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 12:19:09,158 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:09,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:09,159 INFO L82 PathProgramCache]: Analyzing trace with hash -284658338, now seen corresponding path program 14 times [2021-05-02 12:19:09,159 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:09,159 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1578529322] [2021-05-02 12:19:09,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:09,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:09,380 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:09,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:09,405 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 119 proven. 272 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 12:19:09,405 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:09,405 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1578529322] [2021-05-02 12:19:09,405 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1578529322] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:09,405 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [743971401] [2021-05-02 12:19:09,406 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:09,456 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:19:09,456 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:09,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 12:19:09,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:09,616 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:09,629 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 12:19:09,629 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [743971401] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:09,629 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:09,629 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 23] total 25 [2021-05-02 12:19:09,629 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235369205] [2021-05-02 12:19:09,630 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 12:19:09,630 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:09,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 12:19:09,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=536, Unknown=0, NotChecked=0, Total=600 [2021-05-02 12:19:09,631 INFO L87 Difference]: Start difference. First operand 53 states and 55 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 12:19:10,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:10,485 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2021-05-02 12:19:10,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 12:19:10,486 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 51 [2021-05-02 12:19:10,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:10,486 INFO L225 Difference]: With dead ends: 70 [2021-05-02 12:19:10,486 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 12:19:10,487 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 754.5ms TimeCoverageRelationStatistics Valid=149, Invalid=1573, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 12:19:10,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 12:19:10,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-02 12:19:10,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.06) internal successors, (53), 50 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:10,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2021-05-02 12:19:10,495 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 51 [2021-05-02 12:19:10,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:10,495 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2021-05-02 12:19:10,495 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 12:19:10,495 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2021-05-02 12:19:10,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 12:19:10,495 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:10,495 INFO L523 BasicCegarLoop]: trace histogram [21, 17, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:10,695 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:10,696 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:10,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:10,696 INFO L82 PathProgramCache]: Analyzing trace with hash -830015493, now seen corresponding path program 15 times [2021-05-02 12:19:10,696 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:10,696 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1134024018] [2021-05-02 12:19:10,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:10,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:10,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:10,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:10,944 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 126 proven. 306 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 12:19:10,944 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:10,944 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1134024018] [2021-05-02 12:19:10,944 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1134024018] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:10,944 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [946942823] [2021-05-02 12:19:10,944 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:11,008 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-02 12:19:11,009 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:11,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 12:19:11,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:11,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:11,243 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 153 proven. 16 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2021-05-02 12:19:11,243 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [946942823] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:11,243 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:11,243 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 7] total 26 [2021-05-02 12:19:11,243 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1455593384] [2021-05-02 12:19:11,243 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 12:19:11,244 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:11,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 12:19:11,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=542, Unknown=0, NotChecked=0, Total=650 [2021-05-02 12:19:11,244 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:12,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:12,661 INFO L93 Difference]: Finished difference Result 76 states and 84 transitions. [2021-05-02 12:19:12,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 12:19:12,662 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-05-02 12:19:12,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:12,662 INFO L225 Difference]: With dead ends: 76 [2021-05-02 12:19:12,662 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 12:19:12,663 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 294 ImplicationChecksByTransitivity, 1380.8ms TimeCoverageRelationStatistics Valid=319, Invalid=2131, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 12:19:12,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 12:19:12,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2021-05-02 12:19:12,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.0555555555555556) internal successors, (57), 54 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:12,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2021-05-02 12:19:12,666 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 53 [2021-05-02 12:19:12,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:12,666 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2021-05-02 12:19:12,667 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:12,667 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2021-05-02 12:19:12,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 12:19:12,667 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:12,667 INFO L523 BasicCegarLoop]: trace histogram [23, 18, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:12,870 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:12,870 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:12,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:12,870 INFO L82 PathProgramCache]: Analyzing trace with hash -1388525901, now seen corresponding path program 16 times [2021-05-02 12:19:12,870 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:12,870 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [675109713] [2021-05-02 12:19:12,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:12,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:13,134 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:13,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:13,145 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 171 proven. 342 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 12:19:13,145 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:13,145 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [675109713] [2021-05-02 12:19:13,145 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [675109713] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:13,145 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1393492925] [2021-05-02 12:19:13,145 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:13,192 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:19:13,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:13,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-02 12:19:13,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:13,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:13,290 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:13,302 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 171 proven. 342 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 12:19:13,302 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1393492925] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:13,303 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:13,303 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 12:19:13,303 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45749299] [2021-05-02 12:19:13,303 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 12:19:13,303 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:13,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 12:19:13,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 12:19:13,303 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:14,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:14,102 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2021-05-02 12:19:14,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 12:19:14,102 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 2 states have call successors, (4), 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 12:19:14,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:14,103 INFO L225 Difference]: With dead ends: 78 [2021-05-02 12:19:14,103 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 12:19:14,103 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 714.8ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 12:19:14,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 12:19:14,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-05-02 12:19:14,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:14,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2021-05-02 12:19:14,107 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 57 [2021-05-02 12:19:14,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:14,107 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2021-05-02 12:19:14,107 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:14,107 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2021-05-02 12:19:14,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 12:19:14,108 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:14,108 INFO L523 BasicCegarLoop]: trace histogram [24, 19, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:14,312 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:14,312 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:14,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:14,312 INFO L82 PathProgramCache]: Analyzing trace with hash -779870320, now seen corresponding path program 17 times [2021-05-02 12:19:14,313 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:14,313 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [265098538] [2021-05-02 12:19:14,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:14,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:14,594 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:14,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:14,597 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 180 proven. 380 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 12:19:14,597 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:14,597 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [265098538] [2021-05-02 12:19:14,598 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [265098538] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:14,598 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1260560869] [2021-05-02 12:19:14,598 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:16,354 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2021-05-02 12:19:16,355 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:16,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 59 conjunts are in the unsatisfiable core [2021-05-02 12:19:16,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:16,683 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:16,685 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:16,696 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 180 proven. 380 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 12:19:16,696 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1260560869] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:16,696 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:16,697 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-02 12:19:16,697 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220141823] [2021-05-02 12:19:16,697 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 12:19:16,697 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:16,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 12:19:16,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:19:16,697 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 24 states, 24 states have (on average 2.2083333333333335) internal successors, (53), 23 states have internal predecessors, (53), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:17,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:17,562 INFO L93 Difference]: Finished difference Result 80 states and 85 transitions. [2021-05-02 12:19:17,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 12:19:17,563 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.2083333333333335) internal successors, (53), 23 states have internal predecessors, (53), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-02 12:19:17,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:17,564 INFO L225 Difference]: With dead ends: 80 [2021-05-02 12:19:17,564 INFO L226 Difference]: Without dead ends: 63 [2021-05-02 12:19:17,565 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 43 SyntacticMatches, 18 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 983.7ms TimeCoverageRelationStatistics Valid=165, Invalid=1727, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 12:19:17,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-02 12:19:17,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-05-02 12:19:17,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 58 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:17,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2021-05-02 12:19:17,568 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 59 [2021-05-02 12:19:17,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:17,568 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2021-05-02 12:19:17,568 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.2083333333333335) internal successors, (53), 23 states have internal predecessors, (53), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:17,568 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2021-05-02 12:19:17,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 12:19:17,569 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:17,569 INFO L523 BasicCegarLoop]: trace histogram [25, 20, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:17,773 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 12:19:17,773 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:17,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:17,773 INFO L82 PathProgramCache]: Analyzing trace with hash 22590765, now seen corresponding path program 18 times [2021-05-02 12:19:17,773 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:17,773 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [269241569] [2021-05-02 12:19:17,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:17,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:18,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:18,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:18,081 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 189 proven. 420 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 12:19:18,081 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:18,081 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [269241569] [2021-05-02 12:19:18,081 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [269241569] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:18,081 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1534046214] [2021-05-02 12:19:18,081 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:18,524 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 23 check-sat command(s) [2021-05-02 12:19:18,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:18,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 12:19:18,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:18,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:18,553 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:18,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:18,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:19,311 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:19,319 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 304 proven. 137 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2021-05-02 12:19:19,319 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1534046214] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:19,319 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:19,319 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 13] total 35 [2021-05-02 12:19:19,319 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128147475] [2021-05-02 12:19:19,320 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 12:19:19,320 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:19,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 12:19:19,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=968, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 12:19:19,320 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand has 35 states, 35 states have (on average 2.2285714285714286) internal successors, (78), 34 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 12:19:21,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:21,276 INFO L93 Difference]: Finished difference Result 94 states and 106 transitions. [2021-05-02 12:19:21,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 12:19:21,276 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.2285714285714286) internal successors, (78), 34 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 61 [2021-05-02 12:19:21,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:21,277 INFO L225 Difference]: With dead ends: 94 [2021-05-02 12:19:21,277 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 12:19:21,278 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 54 SyntacticMatches, 4 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 664 ImplicationChecksByTransitivity, 2329.5ms TimeCoverageRelationStatistics Valid=651, Invalid=3771, Unknown=0, NotChecked=0, Total=4422 [2021-05-02 12:19:21,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 12:19:21,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 67. [2021-05-02 12:19:21,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.0483870967741935) internal successors, (65), 62 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:21,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 69 transitions. [2021-05-02 12:19:21,281 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 69 transitions. Word has length 61 [2021-05-02 12:19:21,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:21,281 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 69 transitions. [2021-05-02 12:19:21,282 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.2285714285714286) internal successors, (78), 34 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 12:19:21,282 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 69 transitions. [2021-05-02 12:19:21,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-02 12:19:21,282 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:21,282 INFO L523 BasicCegarLoop]: trace histogram [27, 21, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:21,489 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 12:19:21,489 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:21,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:21,489 INFO L82 PathProgramCache]: Analyzing trace with hash -1280798107, now seen corresponding path program 19 times [2021-05-02 12:19:21,489 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:21,489 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1920873080] [2021-05-02 12:19:21,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:21,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:21,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:21,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:21,849 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 242 proven. 462 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 12:19:21,849 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:21,849 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1920873080] [2021-05-02 12:19:21,849 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1920873080] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:21,849 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [643352264] [2021-05-02 12:19:21,849 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:21,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:21,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-02 12:19:21,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:22,030 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:22,033 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:22,047 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 242 proven. 462 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 12:19:22,047 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [643352264] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:22,047 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:22,047 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-02 12:19:22,047 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [388147488] [2021-05-02 12:19:22,047 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 12:19:22,048 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:22,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 12:19:22,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-02 12:19:22,048 INFO L87 Difference]: Start difference. First operand 67 states and 69 transitions. Second operand has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:23,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:23,108 INFO L93 Difference]: Finished difference Result 88 states and 93 transitions. [2021-05-02 12:19:23,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 12:19:23,108 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 2 states have call successors, (4), 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 12:19:23,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:23,109 INFO L225 Difference]: With dead ends: 88 [2021-05-02 12:19:23,109 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 12:19:23,109 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 951.8ms TimeCoverageRelationStatistics Valid=181, Invalid=2075, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 12:19:23,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 12:19:23,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-05-02 12:19:23,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 64 states have (on average 1.046875) internal successors, (67), 64 states have internal predecessors, (67), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:23,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2021-05-02 12:19:23,113 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 65 [2021-05-02 12:19:23,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:23,113 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2021-05-02 12:19:23,113 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:23,113 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2021-05-02 12:19:23,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-02 12:19:23,114 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:23,114 INFO L523 BasicCegarLoop]: trace histogram [28, 22, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:23,332 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:23,333 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:23,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:23,333 INFO L82 PathProgramCache]: Analyzing trace with hash 640400962, now seen corresponding path program 20 times [2021-05-02 12:19:23,333 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:23,333 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [451248585] [2021-05-02 12:19:23,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:23,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:23,688 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:23,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:23,697 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 253 proven. 506 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 12:19:23,698 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:23,698 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [451248585] [2021-05-02 12:19:23,698 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [451248585] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:23,698 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1970805712] [2021-05-02 12:19:23,698 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:23,741 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:19:23,741 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:23,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 59 conjunts are in the unsatisfiable core [2021-05-02 12:19:23,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:24,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:24,006 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 12:19:24,007 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1970805712] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:24,007 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:24,007 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 31] total 33 [2021-05-02 12:19:24,007 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1017547067] [2021-05-02 12:19:24,007 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 12:19:24,007 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:24,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 12:19:24,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=970, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 12:19:24,008 INFO L87 Difference]: Start difference. First operand 69 states and 71 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 12:19:25,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:25,272 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2021-05-02 12:19:25,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 12:19:25,273 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 67 [2021-05-02 12:19:25,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:25,274 INFO L225 Difference]: With dead ends: 90 [2021-05-02 12:19:25,274 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 12:19:25,275 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 1164.6ms TimeCoverageRelationStatistics Valid=201, Invalid=2879, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 12:19:25,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 12:19:25,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-05-02 12:19:25,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0454545454545454) internal successors, (69), 66 states have internal predecessors, (69), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:25,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2021-05-02 12:19:25,278 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 67 [2021-05-02 12:19:25,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:25,279 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2021-05-02 12:19:25,279 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 12:19:25,279 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2021-05-02 12:19:25,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-02 12:19:25,279 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:25,279 INFO L523 BasicCegarLoop]: trace histogram [29, 23, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:25,487 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 12:19:25,488 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:25,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:25,488 INFO L82 PathProgramCache]: Analyzing trace with hash 76768991, now seen corresponding path program 21 times [2021-05-02 12:19:25,488 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:25,488 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [906876228] [2021-05-02 12:19:25,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:25,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:25,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:25,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:25,857 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 264 proven. 552 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 12:19:25,858 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:25,858 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [906876228] [2021-05-02 12:19:25,858 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [906876228] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:25,858 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [983843855] [2021-05-02 12:19:25,858 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:25,956 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-05-02 12:19:25,956 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:25,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 12:19:25,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:26,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:26,499 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 299 proven. 36 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2021-05-02 12:19:26,499 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [983843855] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:26,499 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:26,499 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 9] total 34 [2021-05-02 12:19:26,499 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97122877] [2021-05-02 12:19:26,500 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 12:19:26,500 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:26,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 12:19:26,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1012, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 12:19:26,500 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 34 states, 34 states have (on average 2.2058823529411766) internal successors, (75), 33 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:28,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:28,490 INFO L93 Difference]: Finished difference Result 94 states and 101 transitions. [2021-05-02 12:19:28,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 12:19:28,490 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.2058823529411766) internal successors, (75), 33 states have internal predecessors, (75), 2 states have call successors, (4), 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 12:19:28,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:28,491 INFO L225 Difference]: With dead ends: 94 [2021-05-02 12:19:28,491 INFO L226 Difference]: Without dead ends: 75 [2021-05-02 12:19:28,492 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 482 ImplicationChecksByTransitivity, 1878.6ms TimeCoverageRelationStatistics Valid=325, Invalid=3835, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 12:19:28,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-05-02 12:19:28,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-05-02 12:19:28,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:28,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 77 transitions. [2021-05-02 12:19:28,495 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 77 transitions. Word has length 69 [2021-05-02 12:19:28,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:28,496 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 77 transitions. [2021-05-02 12:19:28,496 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.2058823529411766) internal successors, (75), 33 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:28,496 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 77 transitions. [2021-05-02 12:19:28,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 12:19:28,496 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:28,496 INFO L523 BasicCegarLoop]: trace histogram [31, 24, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:28,699 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:28,699 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:28,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:28,699 INFO L82 PathProgramCache]: Analyzing trace with hash 198128279, now seen corresponding path program 22 times [2021-05-02 12:19:28,699 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:28,699 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [466797640] [2021-05-02 12:19:28,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:28,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:29,078 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:29,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:29,082 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:19:29,082 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:29,082 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [466797640] [2021-05-02 12:19:29,082 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [466797640] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:29,082 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1202227171] [2021-05-02 12:19:29,082 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:29,133 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:19:29,133 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:29,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 52 conjunts are in the unsatisfiable core [2021-05-02 12:19:29,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:29,257 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:29,258 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:29,274 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:19:29,274 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1202227171] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:29,274 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:29,274 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-02 12:19:29,274 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126086889] [2021-05-02 12:19:29,274 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 12:19:29,274 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:29,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 12:19:29,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-02 12:19:29,275 INFO L87 Difference]: Start difference. First operand 75 states and 77 transitions. Second operand has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:30,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:30,542 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2021-05-02 12:19:30,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 12:19:30,543 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 states have internal predecessors, (63), 2 states have call successors, (4), 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 12:19:30,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:30,543 INFO L225 Difference]: With dead ends: 98 [2021-05-02 12:19:30,543 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 12:19:30,544 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 73 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 1086.7ms TimeCoverageRelationStatistics Valid=205, Invalid=2657, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 12:19:30,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 12:19:30,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2021-05-02 12:19:30,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 72 states have internal predecessors, (75), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:30,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2021-05-02 12:19:30,548 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 73 [2021-05-02 12:19:30,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:30,548 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2021-05-02 12:19:30,548 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:30,548 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2021-05-02 12:19:30,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-02 12:19:30,549 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:30,549 INFO L523 BasicCegarLoop]: trace histogram [32, 25, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:30,757 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 12:19:30,757 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:30,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:30,758 INFO L82 PathProgramCache]: Analyzing trace with hash -922013324, now seen corresponding path program 23 times [2021-05-02 12:19:30,758 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:30,758 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349961868] [2021-05-02 12:19:30,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:30,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:31,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:31,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:31,225 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 338 proven. 650 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:19:31,225 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:31,225 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349961868] [2021-05-02 12:19:31,225 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [349961868] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:31,225 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1657042450] [2021-05-02 12:19:31,226 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:36,621 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 33 check-sat command(s) [2021-05-02 12:19:36,622 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:36,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-02 12:19:36,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:37,179 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 338 proven. 650 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:19:37,179 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1657042450] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:37,179 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:37,179 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 12:19:37,179 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990533450] [2021-05-02 12:19:37,179 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 12:19:37,179 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:37,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 12:19:37,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-02 12:19:37,180 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:38,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:38,521 INFO L93 Difference]: Finished difference Result 100 states and 105 transitions. [2021-05-02 12:19:38,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 12:19:38,521 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 2 states have call successors, (4), 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 12:19:38,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:38,522 INFO L225 Difference]: With dead ends: 100 [2021-05-02 12:19:38,522 INFO L226 Difference]: Without dead ends: 79 [2021-05-02 12:19:38,523 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 52 SyntacticMatches, 25 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 1569.9ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 12:19:38,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-05-02 12:19:38,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2021-05-02 12:19:38,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.0405405405405406) internal successors, (77), 74 states have internal predecessors, (77), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:38,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 81 transitions. [2021-05-02 12:19:38,529 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 81 transitions. Word has length 75 [2021-05-02 12:19:38,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:38,530 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 81 transitions. [2021-05-02 12:19:38,530 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:38,530 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 81 transitions. [2021-05-02 12:19:38,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-02 12:19:38,530 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:38,530 INFO L523 BasicCegarLoop]: trace histogram [33, 26, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:38,734 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 12:19:38,735 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:38,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:38,735 INFO L82 PathProgramCache]: Analyzing trace with hash 658697489, now seen corresponding path program 24 times [2021-05-02 12:19:38,735 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:38,735 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [37263619] [2021-05-02 12:19:38,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:38,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:39,180 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:39,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:39,193 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 351 proven. 702 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:19:39,193 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:39,193 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [37263619] [2021-05-02 12:19:39,193 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [37263619] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:39,193 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [916942537] [2021-05-02 12:19:39,193 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:40,477 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2021-05-02 12:19:40,477 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:40,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 62 conjunts are in the unsatisfiable core [2021-05-02 12:19:40,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:40,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:40,516 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:40,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:40,610 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:40,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:40,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:40,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:40,625 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:40,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:40,628 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:40,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:40,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:40,635 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:40,637 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:40,640 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:40,641 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:40,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:40,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:40,676 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:40,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:40,680 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:40,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:41,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:41,557 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 301 proven. 526 refuted. 0 times theorem prover too weak. 262 trivial. 0 not checked. [2021-05-02 12:19:41,557 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [916942537] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:41,557 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:41,557 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 18] total 40 [2021-05-02 12:19:41,557 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775080817] [2021-05-02 12:19:41,557 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-02 12:19:41,557 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:41,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-02 12:19:41,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=1327, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 12:19:41,559 INFO L87 Difference]: Start difference. First operand 79 states and 81 transitions. Second operand has 40 states, 40 states have (on average 2.225) internal successors, (89), 39 states have internal predecessors, (89), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:44,753 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 12:19:45,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:45,435 INFO L93 Difference]: Finished difference Result 111 states and 122 transitions. [2021-05-02 12:19:45,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-02 12:19:45,436 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.225) internal successors, (89), 39 states have internal predecessors, (89), 2 states have call successors, (4), 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 12:19:45,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:45,436 INFO L225 Difference]: With dead ends: 111 [2021-05-02 12:19:45,436 INFO L226 Difference]: Without dead ends: 90 [2021-05-02 12:19:45,437 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 72 SyntacticMatches, 7 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 834 ImplicationChecksByTransitivity, 4100.6ms TimeCoverageRelationStatistics Valid=732, Invalid=5430, Unknown=0, NotChecked=0, Total=6162 [2021-05-02 12:19:45,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-02 12:19:45,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 84. [2021-05-02 12:19:45,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 79 states have (on average 1.0379746835443038) internal successors, (82), 79 states have internal predecessors, (82), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:45,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2021-05-02 12:19:45,442 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 77 [2021-05-02 12:19:45,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:45,442 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2021-05-02 12:19:45,442 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 2.225) internal successors, (89), 39 states have internal predecessors, (89), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:45,442 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2021-05-02 12:19:45,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 12:19:45,442 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:45,442 INFO L523 BasicCegarLoop]: trace histogram [36, 27, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:45,645 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 12:19:45,646 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:45,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:45,646 INFO L82 PathProgramCache]: Analyzing trace with hash -1463693724, now seen corresponding path program 25 times [2021-05-02 12:19:45,646 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:45,646 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [723721063] [2021-05-02 12:19:45,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:45,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:46,148 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:46,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:46,163 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 476 proven. 756 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 12:19:46,163 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:46,163 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [723721063] [2021-05-02 12:19:46,163 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [723721063] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:46,163 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [675488012] [2021-05-02 12:19:46,163 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:46,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:46,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 58 conjunts are in the unsatisfiable core [2021-05-02 12:19:46,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:46,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:46,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:46,382 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 476 proven. 756 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 12:19:46,382 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [675488012] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:46,382 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:46,382 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-02 12:19:46,384 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [914105653] [2021-05-02 12:19:46,384 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 12:19:46,384 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:46,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 12:19:46,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-02 12:19:46,385 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand has 32 states, 32 states have (on average 2.15625) internal successors, (69), 31 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:47,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:47,921 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2021-05-02 12:19:47,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 12:19:47,922 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.15625) internal successors, (69), 31 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2021-05-02 12:19:47,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:47,922 INFO L225 Difference]: With dead ends: 110 [2021-05-02 12:19:47,922 INFO L226 Difference]: Without dead ends: 86 [2021-05-02 12:19:47,923 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 83 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 1343.6ms TimeCoverageRelationStatistics Valid=229, Invalid=3311, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 12:19:47,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-02 12:19:47,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2021-05-02 12:19:47,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 81 states have (on average 1.037037037037037) internal successors, (84), 81 states have internal predecessors, (84), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:47,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2021-05-02 12:19:47,928 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 83 [2021-05-02 12:19:47,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:47,928 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2021-05-02 12:19:47,928 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.15625) internal successors, (69), 31 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:47,928 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2021-05-02 12:19:47,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-02 12:19:47,928 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:47,928 INFO L523 BasicCegarLoop]: trace histogram [37, 28, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:48,133 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:48,133 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:48,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:48,134 INFO L82 PathProgramCache]: Analyzing trace with hash -888759039, now seen corresponding path program 26 times [2021-05-02 12:19:48,134 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:48,134 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [775214440] [2021-05-02 12:19:48,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:48,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:48,660 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:48,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:48,667 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 493 proven. 812 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 12:19:48,667 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:48,667 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [775214440] [2021-05-02 12:19:48,667 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [775214440] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:48,667 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1921610604] [2021-05-02 12:19:48,668 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:48,709 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:19:48,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:48,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 77 conjunts are in the unsatisfiable core [2021-05-02 12:19:48,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:49,122 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:49,128 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 12:19:49,128 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1921610604] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:49,128 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:49,128 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 40] total 42 [2021-05-02 12:19:49,128 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218758454] [2021-05-02 12:19:49,129 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 12:19:49,129 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:49,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 12:19:49,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1612, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 12:19:49,129 INFO L87 Difference]: Start difference. First operand 86 states and 88 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 12:19:51,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:51,060 INFO L93 Difference]: Finished difference Result 112 states and 117 transitions. [2021-05-02 12:19:51,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 12:19:51,061 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 85 [2021-05-02 12:19:51,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:51,061 INFO L225 Difference]: With dead ends: 112 [2021-05-02 12:19:51,061 INFO L226 Difference]: Without dead ends: 88 [2021-05-02 12:19:51,062 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 428 ImplicationChecksByTransitivity, 1752.3ms TimeCoverageRelationStatistics Valid=255, Invalid=4715, Unknown=0, NotChecked=0, Total=4970 [2021-05-02 12:19:51,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-05-02 12:19:51,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2021-05-02 12:19:51,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 83 states have (on average 1.036144578313253) internal successors, (86), 83 states have internal predecessors, (86), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:51,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2021-05-02 12:19:51,067 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 85 [2021-05-02 12:19:51,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:51,067 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2021-05-02 12:19:51,067 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 12:19:51,067 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2021-05-02 12:19:51,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-05-02 12:19:51,067 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:51,067 INFO L523 BasicCegarLoop]: trace histogram [38, 29, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:51,269 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-02 12:19:51,269 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:51,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:51,269 INFO L82 PathProgramCache]: Analyzing trace with hash 1867659358, now seen corresponding path program 27 times [2021-05-02 12:19:51,269 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:51,269 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [280747628] [2021-05-02 12:19:51,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:51,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:51,809 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:51,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:51,813 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 510 proven. 870 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 12:19:51,813 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:51,813 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [280747628] [2021-05-02 12:19:51,813 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [280747628] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:51,813 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1345395459] [2021-05-02 12:19:51,813 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:52,006 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2021-05-02 12:19:52,007 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:52,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-02 12:19:52,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:52,056 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:53,283 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:53,293 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 551 proven. 81 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2021-05-02 12:19:53,293 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1345395459] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:53,293 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:53,293 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 12] total 43 [2021-05-02 12:19:53,293 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633410412] [2021-05-02 12:19:53,294 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 12:19:53,294 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:53,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 12:19:53,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1666, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 12:19:53,294 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand has 43 states, 43 states have (on average 2.1627906976744184) internal successors, (93), 42 states have internal predecessors, (93), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:57,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:57,165 INFO L93 Difference]: Finished difference Result 117 states and 125 transitions. [2021-05-02 12:19:57,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 12:19:57,166 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.1627906976744184) internal successors, (93), 42 states have internal predecessors, (93), 2 states have call successors, (4), 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 12:19:57,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:57,166 INFO L225 Difference]: With dead ends: 117 [2021-05-02 12:19:57,166 INFO L226 Difference]: Without dead ends: 93 [2021-05-02 12:19:57,167 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 85 SyntacticMatches, 4 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 807 ImplicationChecksByTransitivity, 3446.7ms TimeCoverageRelationStatistics Valid=415, Invalid=6391, Unknown=0, NotChecked=0, Total=6806 [2021-05-02 12:19:57,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-02 12:19:57,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2021-05-02 12:19:57,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 88 states have (on average 1.0340909090909092) internal successors, (91), 88 states have internal predecessors, (91), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:57,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2021-05-02 12:19:57,172 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 87 [2021-05-02 12:19:57,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:57,172 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2021-05-02 12:19:57,172 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 2.1627906976744184) internal successors, (93), 42 states have internal predecessors, (93), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:57,172 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2021-05-02 12:19:57,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-02 12:19:57,172 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:57,173 INFO L523 BasicCegarLoop]: trace histogram [40, 30, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:57,375 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:57,376 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:57,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:57,376 INFO L82 PathProgramCache]: Analyzing trace with hash 994849558, now seen corresponding path program 28 times [2021-05-02 12:19:57,376 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:57,376 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [942825375] [2021-05-02 12:19:57,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:57,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:57,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:57,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:57,951 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 589 proven. 930 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 12:19:57,952 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:57,952 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [942825375] [2021-05-02 12:19:57,952 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [942825375] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:57,952 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [532900435] [2021-05-02 12:19:57,952 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:57,995 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:19:57,995 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:57,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 64 conjunts are in the unsatisfiable core [2021-05-02 12:19:57,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:58,163 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:58,165 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:58,198 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 589 proven. 930 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 12:19:58,199 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [532900435] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:58,199 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:58,199 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2021-05-02 12:19:58,199 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016530985] [2021-05-02 12:19:58,199 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 12:19:58,199 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:58,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 12:19:58,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 12:19:58,200 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 34 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:00,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:00,014 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2021-05-02 12:20:00,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 12:20:00,015 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 34 states have internal predecessors, (75), 2 states have call successors, (4), 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 12:20:00,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:00,015 INFO L225 Difference]: With dead ends: 122 [2021-05-02 12:20:00,015 INFO L226 Difference]: Without dead ends: 95 [2021-05-02 12:20:00,015 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 470 ImplicationChecksByTransitivity, 1533.9ms TimeCoverageRelationStatistics Valid=253, Invalid=4037, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 12:20:00,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-05-02 12:20:00,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2021-05-02 12:20:00,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 90 states have (on average 1.0333333333333334) internal successors, (93), 90 states have internal predecessors, (93), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:00,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2021-05-02 12:20:00,020 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 91 [2021-05-02 12:20:00,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:00,021 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2021-05-02 12:20:00,021 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 34 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:00,021 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2021-05-02 12:20:00,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-02 12:20:00,021 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:00,021 INFO L523 BasicCegarLoop]: trace histogram [41, 31, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:00,232 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-02 12:20:00,232 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:00,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:00,232 INFO L82 PathProgramCache]: Analyzing trace with hash -656730957, now seen corresponding path program 29 times [2021-05-02 12:20:00,232 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:00,232 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [411483881] [2021-05-02 12:20:00,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:00,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:00,822 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:00,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:00,826 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 608 proven. 992 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 12:20:00,826 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:00,826 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [411483881] [2021-05-02 12:20:00,826 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [411483881] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:00,826 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1192751942] [2021-05-02 12:20:00,826 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:20:12,551 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 42 check-sat command(s) [2021-05-02 12:20:12,551 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:20:12,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 78 conjunts are in the unsatisfiable core [2021-05-02 12:20:12,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:12,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:12,975 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:12,993 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 266 proven. 1406 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 12:20:12,993 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1192751942] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:12,993 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:12,993 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 40] total 42 [2021-05-02 12:20:12,993 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311085380] [2021-05-02 12:20:12,993 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 12:20:12,993 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:12,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 12:20:12,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1609, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 12:20:12,994 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand has 42 states, 42 states have (on average 2.119047619047619) internal successors, (89), 41 states have internal predecessors, (89), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:15,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:15,377 INFO L93 Difference]: Finished difference Result 124 states and 129 transitions. [2021-05-02 12:20:15,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 12:20:15,378 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.119047619047619) internal successors, (89), 41 states have internal predecessors, (89), 2 states have call successors, (4), 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 12:20:15,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:15,378 INFO L225 Difference]: With dead ends: 124 [2021-05-02 12:20:15,379 INFO L226 Difference]: Without dead ends: 97 [2021-05-02 12:20:15,379 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 87 SyntacticMatches, 2 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 514 ImplicationChecksByTransitivity, 2012.1ms TimeCoverageRelationStatistics Valid=273, Invalid=5129, Unknown=0, NotChecked=0, Total=5402 [2021-05-02 12:20:15,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-05-02 12:20:15,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2021-05-02 12:20:15,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 92 states have (on average 1.0326086956521738) internal successors, (95), 92 states have internal predecessors, (95), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:15,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 99 transitions. [2021-05-02 12:20:15,384 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 99 transitions. Word has length 93 [2021-05-02 12:20:15,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:15,385 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 99 transitions. [2021-05-02 12:20:15,385 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 2.119047619047619) internal successors, (89), 41 states have internal predecessors, (89), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:15,385 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 99 transitions. [2021-05-02 12:20:15,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-02 12:20:15,385 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:15,385 INFO L523 BasicCegarLoop]: trace histogram [42, 32, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:15,591 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-02 12:20:15,592 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:15,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:15,592 INFO L82 PathProgramCache]: Analyzing trace with hash 1312293648, now seen corresponding path program 30 times [2021-05-02 12:20:15,592 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:15,592 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [320296580] [2021-05-02 12:20:15,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:15,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:16,325 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:16,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:16,329 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 627 proven. 1056 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 12:20:16,329 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:16,329 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [320296580] [2021-05-02 12:20:16,329 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [320296580] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:16,329 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [390394028] [2021-05-02 12:20:16,329 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 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 12:20:19,993 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 43 check-sat command(s) [2021-05-02 12:20:19,993 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:20:19,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 97 conjunts are in the unsatisfiable core [2021-05-02 12:20:19,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:20,487 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 123 proven. 1640 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:20:20,487 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [390394028] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:20,487 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:20,487 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 43] total 45 [2021-05-02 12:20:20,487 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748803069] [2021-05-02 12:20:20,487 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 12:20:20,488 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:20,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 12:20:20,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1860, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 12:20:20,488 INFO L87 Difference]: Start difference. First operand 97 states and 99 transitions. Second operand has 45 states, 45 states have (on average 2.111111111111111) internal successors, (95), 44 states have internal predecessors, (95), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:22,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:22,908 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2021-05-02 12:20:22,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 12:20:22,909 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.111111111111111) internal successors, (95), 44 states have internal predecessors, (95), 2 states have call successors, (4), 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 12:20:22,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:22,909 INFO L225 Difference]: With dead ends: 126 [2021-05-02 12:20:22,909 INFO L226 Difference]: Without dead ends: 99 [2021-05-02 12:20:22,910 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 86 SyntacticMatches, 3 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 550 ImplicationChecksByTransitivity, 2224.3ms TimeCoverageRelationStatistics Valid=285, Invalid=5721, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 12:20:22,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-05-02 12:20:22,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2021-05-02 12:20:22,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 94 states have (on average 1.0319148936170213) internal successors, (97), 94 states have internal predecessors, (97), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:22,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 101 transitions. [2021-05-02 12:20:22,915 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 101 transitions. Word has length 95 [2021-05-02 12:20:22,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:22,915 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 101 transitions. [2021-05-02 12:20:22,916 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 2.111111111111111) internal successors, (95), 44 states have internal predecessors, (95), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:22,916 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 101 transitions. [2021-05-02 12:20:22,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-02 12:20:22,916 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:22,916 INFO L523 BasicCegarLoop]: trace histogram [43, 33, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:23,120 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 12:20:23,121 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:23,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:23,121 INFO L82 PathProgramCache]: Analyzing trace with hash -535638483, now seen corresponding path program 31 times [2021-05-02 12:20:23,121 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:23,121 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1695650396] [2021-05-02 12:20:23,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:23,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:23,802 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:23,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:23,814 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 646 proven. 1122 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 12:20:23,814 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:23,814 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1695650396] [2021-05-02 12:20:23,814 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1695650396] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:23,814 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1744100074] [2021-05-02 12:20:23,814 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 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 12:20:23,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:23,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-02 12:20:23,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:24,050 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:24,054 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:24,080 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 646 proven. 1122 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 12:20:24,080 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1744100074] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:24,080 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:24,080 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 38 [2021-05-02 12:20:24,080 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237649032] [2021-05-02 12:20:24,080 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 12:20:24,080 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:24,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 12:20:24,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 12:20:24,081 INFO L87 Difference]: Start difference. First operand 99 states and 101 transitions. Second operand has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:26,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:26,330 INFO L93 Difference]: Finished difference Result 128 states and 133 transitions. [2021-05-02 12:20:26,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-02 12:20:26,330 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 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 12:20:26,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:26,331 INFO L225 Difference]: With dead ends: 128 [2021-05-02 12:20:26,331 INFO L226 Difference]: Without dead ends: 101 [2021-05-02 12:20:26,331 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 97 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 566 ImplicationChecksByTransitivity, 1873.7ms TimeCoverageRelationStatistics Valid=277, Invalid=4835, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 12:20:26,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-05-02 12:20:26,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2021-05-02 12:20:26,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 96 states have (on average 1.03125) internal successors, (99), 96 states have internal predecessors, (99), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:26,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2021-05-02 12:20:26,337 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 97 [2021-05-02 12:20:26,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:26,337 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2021-05-02 12:20:26,337 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:26,337 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2021-05-02 12:20:26,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-02 12:20:26,337 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:26,338 INFO L523 BasicCegarLoop]: trace histogram [44, 34, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:26,541 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 12:20:26,541 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:26,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:26,542 INFO L82 PathProgramCache]: Analyzing trace with hash 1718044170, now seen corresponding path program 32 times [2021-05-02 12:20:26,542 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:26,542 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [306852028] [2021-05-02 12:20:26,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:26,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:27,289 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:27,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:27,292 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 665 proven. 1190 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 12:20:27,292 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:27,292 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [306852028] [2021-05-02 12:20:27,292 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [306852028] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:27,293 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1275911386] [2021-05-02 12:20:27,293 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 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 12:20:27,340 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:20:27,340 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:20:27,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 91 conjunts are in the unsatisfiable core [2021-05-02 12:20:27,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:27,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:27,928 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 12:20:27,928 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1275911386] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:27,928 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:27,928 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 47] total 49 [2021-05-02 12:20:27,928 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265900212] [2021-05-02 12:20:27,929 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 12:20:27,929 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:27,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 12:20:27,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=2222, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 12:20:27,929 INFO L87 Difference]: Start difference. First operand 101 states and 103 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 12:20:30,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:30,664 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2021-05-02 12:20:30,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 12:20:30,664 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 99 [2021-05-02 12:20:30,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:30,665 INFO L225 Difference]: With dead ends: 130 [2021-05-02 12:20:30,665 INFO L226 Difference]: Without dead ends: 103 [2021-05-02 12:20:30,666 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 90 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 619 ImplicationChecksByTransitivity, 2494.3ms TimeCoverageRelationStatistics Valid=305, Invalid=6667, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 12:20:30,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-05-02 12:20:30,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-05-02 12:20:30,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.030612244897959) internal successors, (101), 98 states have internal predecessors, (101), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:30,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 105 transitions. [2021-05-02 12:20:30,672 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 105 transitions. Word has length 99 [2021-05-02 12:20:30,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:30,672 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 105 transitions. [2021-05-02 12:20:30,672 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 12:20:30,672 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 105 transitions. [2021-05-02 12:20:30,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 12:20:30,672 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:30,672 INFO L523 BasicCegarLoop]: trace histogram [45, 35, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:30,887 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 12:20:30,887 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:30,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:30,888 INFO L82 PathProgramCache]: Analyzing trace with hash -1451410777, now seen corresponding path program 33 times [2021-05-02 12:20:30,888 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:30,888 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [870281324] [2021-05-02 12:20:30,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:30,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:31,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:31,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:31,628 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 684 proven. 1260 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 12:20:31,628 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:31,628 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [870281324] [2021-05-02 12:20:31,628 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [870281324] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:31,628 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [636438654] [2021-05-02 12:20:31,628 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 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 12:20:31,955 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-05-02 12:20:31,955 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:20:31,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 12:20:31,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:31,989 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:34,074 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:34,086 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 735 proven. 100 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2021-05-02 12:20:34,086 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [636438654] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:34,086 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:34,086 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 13] total 50 [2021-05-02 12:20:34,086 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2095986061] [2021-05-02 12:20:34,086 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 12:20:34,086 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:34,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 12:20:34,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=228, Invalid=2222, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 12:20:34,087 INFO L87 Difference]: Start difference. First operand 103 states and 105 transitions. Second operand has 50 states, 50 states have (on average 2.14) internal successors, (107), 49 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:41,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:41,055 INFO L93 Difference]: Finished difference Result 136 states and 144 transitions. [2021-05-02 12:20:41,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 12:20:41,056 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.14) internal successors, (107), 49 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2021-05-02 12:20:41,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:41,056 INFO L225 Difference]: With dead ends: 136 [2021-05-02 12:20:41,056 INFO L226 Difference]: Without dead ends: 109 [2021-05-02 12:20:41,057 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 95 SyntacticMatches, 8 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1198 ImplicationChecksByTransitivity, 7458.8ms TimeCoverageRelationStatistics Valid=673, Invalid=8833, Unknown=0, NotChecked=0, Total=9506 [2021-05-02 12:20:41,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-02 12:20:41,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 107. [2021-05-02 12:20:41,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 102 states have (on average 1.0294117647058822) internal successors, (105), 102 states have internal predecessors, (105), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:41,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 109 transitions. [2021-05-02 12:20:41,063 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 109 transitions. Word has length 101 [2021-05-02 12:20:41,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:41,066 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 109 transitions. [2021-05-02 12:20:41,066 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 2.14) internal successors, (107), 49 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:41,066 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 109 transitions. [2021-05-02 12:20:41,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-02 12:20:41,067 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:41,067 INFO L523 BasicCegarLoop]: trace histogram [47, 36, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:41,270 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-02 12:20:41,270 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:41,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:41,271 INFO L82 PathProgramCache]: Analyzing trace with hash -1438941089, now seen corresponding path program 34 times [2021-05-02 12:20:41,271 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:41,271 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1556288588] [2021-05-02 12:20:41,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:41,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:42,173 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:42,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:42,180 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 777 proven. 1332 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:20:42,180 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:42,180 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1556288588] [2021-05-02 12:20:42,181 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1556288588] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:42,181 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1987706176] [2021-05-02 12:20:42,181 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 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 12:20:42,239 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:20:42,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:20:42,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 76 conjunts are in the unsatisfiable core [2021-05-02 12:20:42,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:42,448 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:42,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:42,476 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 777 proven. 1332 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:20:42,476 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1987706176] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:42,477 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:42,480 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39] total 41 [2021-05-02 12:20:42,480 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544575502] [2021-05-02 12:20:42,480 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 12:20:42,480 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:42,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 12:20:42,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 12:20:42,481 INFO L87 Difference]: Start difference. First operand 107 states and 109 transitions. Second operand has 41 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 40 states have internal predecessors, (87), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:45,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:45,004 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2021-05-02 12:20:45,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 12:20:45,004 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 40 states have internal predecessors, (87), 2 states have call successors, (4), 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 12:20:45,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:45,005 INFO L225 Difference]: With dead ends: 138 [2021-05-02 12:20:45,005 INFO L226 Difference]: Without dead ends: 109 [2021-05-02 12:20:45,005 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 671 ImplicationChecksByTransitivity, 2202.2ms TimeCoverageRelationStatistics Valid=301, Invalid=5705, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 12:20:45,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-02 12:20:45,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2021-05-02 12:20:45,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.0288461538461537) internal successors, (107), 104 states have internal predecessors, (107), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:45,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2021-05-02 12:20:45,012 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 105 [2021-05-02 12:20:45,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:45,012 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2021-05-02 12:20:45,012 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 40 states have internal predecessors, (87), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:45,012 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2021-05-02 12:20:45,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-02 12:20:45,012 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:45,012 INFO L523 BasicCegarLoop]: trace histogram [48, 37, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:45,213 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-02 12:20:45,213 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:45,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:45,213 INFO L82 PathProgramCache]: Analyzing trace with hash 1799146300, now seen corresponding path program 35 times [2021-05-02 12:20:45,213 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:45,213 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [846780914] [2021-05-02 12:20:45,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:45,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:46,003 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:46,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:46,011 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 798 proven. 1406 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:20:46,011 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:46,011 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [846780914] [2021-05-02 12:20:46,012 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [846780914] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:46,012 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1871472761] [2021-05-02 12:20:46,012 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 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 12:21:13,827 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 49 check-sat command(s) [2021-05-02 12:21:13,827 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:21:13,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 132 conjunts are in the unsatisfiable core [2021-05-02 12:21:13,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:14,874 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 798 proven. 1406 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:21:14,874 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1871472761] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:14,874 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:14,874 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40] total 42 [2021-05-02 12:21:14,874 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304455855] [2021-05-02 12:21:14,874 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 12:21:14,875 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:14,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 12:21:14,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1603, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 12:21:14,875 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 42 states, 42 states have (on average 2.119047619047619) internal successors, (89), 41 states have internal predecessors, (89), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:17,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:17,562 INFO L93 Difference]: Finished difference Result 140 states and 145 transitions. [2021-05-02 12:21:17,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 12:21:17,563 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.119047619047619) internal successors, (89), 41 states have internal predecessors, (89), 2 states have call successors, (4), 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 12:21:17,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:17,563 INFO L225 Difference]: With dead ends: 140 [2021-05-02 12:21:17,563 INFO L226 Difference]: Without dead ends: 111 [2021-05-02 12:21:17,564 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 73 SyntacticMatches, 36 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 774 ImplicationChecksByTransitivity, 2966.6ms TimeCoverageRelationStatistics Valid=309, Invalid=6011, Unknown=0, NotChecked=0, Total=6320 [2021-05-02 12:21:17,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-05-02 12:21:17,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2021-05-02 12:21:17,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 106 states have (on average 1.028301886792453) internal successors, (109), 106 states have internal predecessors, (109), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:17,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 113 transitions. [2021-05-02 12:21:17,570 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 113 transitions. Word has length 107 [2021-05-02 12:21:17,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:17,570 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 113 transitions. [2021-05-02 12:21:17,570 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 2.119047619047619) internal successors, (89), 41 states have internal predecessors, (89), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:17,570 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 113 transitions. [2021-05-02 12:21:17,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-05-02 12:21:17,571 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:17,571 INFO L523 BasicCegarLoop]: trace histogram [49, 38, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:17,772 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-02 12:21:17,772 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:17,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:17,773 INFO L82 PathProgramCache]: Analyzing trace with hash -250162471, now seen corresponding path program 36 times [2021-05-02 12:21:17,773 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:17,773 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1277910883] [2021-05-02 12:21:17,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:17,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:18,619 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:18,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:18,623 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 819 proven. 1482 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:21:18,623 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:18,623 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1277910883] [2021-05-02 12:21:18,623 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1277910883] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:18,623 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1946074480] [2021-05-02 12:21:18,623 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 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 12:21:28,769 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 47 check-sat command(s) [2021-05-02 12:21:28,769 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:21:28,777 WARN L261 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 142 conjunts are in the unsatisfiable core [2021-05-02 12:21:28,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:28,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:28,879 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:30,973 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:30,977 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:30,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:30,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:33,943 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 657 proven. 1670 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-05-02 12:21:33,944 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1946074480] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:33,944 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:33,944 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42] total 71 [2021-05-02 12:21:33,944 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [25011665] [2021-05-02 12:21:33,944 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2021-05-02 12:21:33,944 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:33,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-05-02 12:21:33,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=843, Invalid=4127, Unknown=0, NotChecked=0, Total=4970 [2021-05-02 12:21:33,945 INFO L87 Difference]: Start difference. First operand 111 states and 113 transitions. Second operand has 71 states, 71 states have (on average 2.112676056338028) internal successors, (150), 70 states have internal predecessors, (150), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:41,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:41,797 INFO L93 Difference]: Finished difference Result 178 states and 202 transitions. [2021-05-02 12:21:41,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-05-02 12:21:41,797 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 2.112676056338028) internal successors, (150), 70 states have internal predecessors, (150), 2 states have call successors, (4), 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 12:21:41,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:41,798 INFO L225 Difference]: With dead ends: 178 [2021-05-02 12:21:41,798 INFO L226 Difference]: Without dead ends: 149 [2021-05-02 12:21:41,799 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 73 SyntacticMatches, 22 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3613 ImplicationChecksByTransitivity, 10575.2ms TimeCoverageRelationStatistics Valid=2541, Invalid=16641, Unknown=0, NotChecked=0, Total=19182 [2021-05-02 12:21:41,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-02 12:21:41,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 115. [2021-05-02 12:21:41,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.0272727272727273) internal successors, (113), 110 states have internal predecessors, (113), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:41,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 117 transitions. [2021-05-02 12:21:41,806 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 117 transitions. Word has length 109 [2021-05-02 12:21:41,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:41,806 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 117 transitions. [2021-05-02 12:21:41,806 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 71 states, 71 states have (on average 2.112676056338028) internal successors, (150), 70 states have internal predecessors, (150), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:41,806 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 117 transitions. [2021-05-02 12:21:41,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-02 12:21:41,806 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:41,807 INFO L523 BasicCegarLoop]: trace histogram [51, 39, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:42,011 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,40 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:21:42,011 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:42,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:42,011 INFO L82 PathProgramCache]: Analyzing trace with hash -1101895919, now seen corresponding path program 37 times [2021-05-02 12:21:42,011 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:42,011 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1502730186] [2021-05-02 12:21:42,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:42,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:42,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:42,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:42,987 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 920 proven. 1560 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 12:21:42,987 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:42,987 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1502730186] [2021-05-02 12:21:42,987 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1502730186] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:42,987 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1180488641] [2021-05-02 12:21:42,987 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 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 12:21:43,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:43,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 82 conjunts are in the unsatisfiable core [2021-05-02 12:21:43,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:43,263 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:43,274 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:43,309 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 920 proven. 1560 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 12:21:43,310 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1180488641] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:43,310 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:43,310 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42] total 44 [2021-05-02 12:21:43,310 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291510425] [2021-05-02 12:21:43,310 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 12:21:43,310 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:43,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 12:21:43,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1767, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 12:21:43,311 INFO L87 Difference]: Start difference. First operand 115 states and 117 transitions. Second operand has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:46,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:46,378 INFO L93 Difference]: Finished difference Result 148 states and 153 transitions. [2021-05-02 12:21:46,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 12:21:46,379 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 2 states have call successors, (4), 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 12:21:46,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:46,379 INFO L225 Difference]: With dead ends: 148 [2021-05-02 12:21:46,380 INFO L226 Difference]: Without dead ends: 117 [2021-05-02 12:21:46,380 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 113 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 785 ImplicationChecksByTransitivity, 2496.7ms TimeCoverageRelationStatistics Valid=325, Invalid=6647, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 12:21:46,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-05-02 12:21:46,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2021-05-02 12:21:46,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 112 states have (on average 1.0267857142857142) internal successors, (115), 112 states have internal predecessors, (115), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:46,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 119 transitions. [2021-05-02 12:21:46,387 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 119 transitions. Word has length 113 [2021-05-02 12:21:46,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:46,387 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 119 transitions. [2021-05-02 12:21:46,387 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:46,387 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 119 transitions. [2021-05-02 12:21:46,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-05-02 12:21:46,388 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:46,388 INFO L523 BasicCegarLoop]: trace histogram [52, 40, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:46,593 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:21:46,593 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:46,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:46,593 INFO L82 PathProgramCache]: Analyzing trace with hash -1250065170, now seen corresponding path program 38 times [2021-05-02 12:21:46,593 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:46,593 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1570715707] [2021-05-02 12:21:46,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:46,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:47,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:47,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:47,592 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 943 proven. 1640 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 12:21:47,592 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:47,592 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1570715707] [2021-05-02 12:21:47,592 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1570715707] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:47,592 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [41783151] [2021-05-02 12:21:47,592 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 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 12:21:47,643 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:21:47,643 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:21:47,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 107 conjunts are in the unsatisfiable core [2021-05-02 12:21:47,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:48,405 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:48,414 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 12:21:48,414 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [41783151] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:48,414 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:48,414 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 55] total 57 [2021-05-02 12:21:48,414 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892074265] [2021-05-02 12:21:48,414 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-02 12:21:48,414 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:48,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-02 12:21:48,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=3040, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 12:21:48,415 INFO L87 Difference]: Start difference. First operand 117 states and 119 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 12:21:52,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:52,394 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2021-05-02 12:21:52,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 12:21:52,394 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 115 [2021-05-02 12:21:52,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:52,395 INFO L225 Difference]: With dead ends: 150 [2021-05-02 12:21:52,395 INFO L226 Difference]: Without dead ends: 119 [2021-05-02 12:21:52,395 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 104 SyntacticMatches, 1 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 848 ImplicationChecksByTransitivity, 3380.5ms TimeCoverageRelationStatistics Valid=357, Invalid=9149, Unknown=0, NotChecked=0, Total=9506 [2021-05-02 12:21:52,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-05-02 12:21:52,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2021-05-02 12:21:52,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 114 states have (on average 1.0263157894736843) internal successors, (117), 114 states have internal predecessors, (117), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:52,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2021-05-02 12:21:52,403 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 115 [2021-05-02 12:21:52,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:52,405 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2021-05-02 12:21:52,405 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 12:21:52,405 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2021-05-02 12:21:52,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-05-02 12:21:52,405 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:52,405 INFO L523 BasicCegarLoop]: trace histogram [53, 41, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:52,620 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-05-02 12:21:52,620 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:52,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:52,621 INFO L82 PathProgramCache]: Analyzing trace with hash -1906794613, now seen corresponding path program 39 times [2021-05-02 12:21:52,621 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:52,621 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1881388479] [2021-05-02 12:21:52,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:52,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:53,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:53,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:53,672 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 966 proven. 1722 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 12:21:53,672 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:53,672 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1881388479] [2021-05-02 12:21:53,672 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1881388479] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:53,672 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1925222217] [2021-05-02 12:21:53,672 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 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 12:21:54,159 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2021-05-02 12:21:54,160 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:21:54,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 44 conjunts are in the unsatisfiable core [2021-05-02 12:21:54,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:56,817 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:56,825 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 1025 proven. 144 refuted. 0 times theorem prover too weak. 1640 trivial. 0 not checked. [2021-05-02 12:21:56,825 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1925222217] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:56,825 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:56,825 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 15] total 58 [2021-05-02 12:21:56,825 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106534473] [2021-05-02 12:21:56,826 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-02 12:21:56,826 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:56,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-02 12:21:56,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=334, Invalid=2972, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 12:21:56,826 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand has 58 states, 58 states have (on average 2.1206896551724137) internal successors, (123), 57 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:22:01,480 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 12:22:03,143 WARN L205 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 12:22:04,111 WARN L205 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 12:22:05,950 WARN L205 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 12:22:07,644 WARN L205 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 12:22:09,370 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 12:22:11,727 WARN L205 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 12:22:12,693 WARN L205 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 12:22:13,487 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 12:22:14,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:22:14,113 INFO L93 Difference]: Finished difference Result 156 states and 164 transitions. [2021-05-02 12:22:14,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-02 12:22:14,114 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.1206896551724137) internal successors, (123), 57 states have internal predecessors, (123), 2 states have call successors, (4), 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 12:22:14,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:22:14,114 INFO L225 Difference]: With dead ends: 156 [2021-05-02 12:22:14,114 INFO L226 Difference]: Without dead ends: 125 [2021-05-02 12:22:14,115 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1651 ImplicationChecksByTransitivity, 18205.2ms TimeCoverageRelationStatistics Valid=943, Invalid=11939, Unknown=0, NotChecked=0, Total=12882 [2021-05-02 12:22:14,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-02 12:22:14,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 123. [2021-05-02 12:22:14,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 118 states have (on average 1.0254237288135593) internal successors, (121), 118 states have internal predecessors, (121), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:22:14,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 125 transitions. [2021-05-02 12:22:14,123 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 125 transitions. Word has length 117 [2021-05-02 12:22:14,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:22:14,123 INFO L480 AbstractCegarLoop]: Abstraction has 123 states and 125 transitions. [2021-05-02 12:22:14,123 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 2.1206896551724137) internal successors, (123), 57 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:22:14,123 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 125 transitions. [2021-05-02 12:22:14,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-05-02 12:22:14,123 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:22:14,123 INFO L523 BasicCegarLoop]: trace histogram [55, 42, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:22:14,328 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,43 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:22:14,329 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:22:14,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:22:14,329 INFO L82 PathProgramCache]: Analyzing trace with hash 143876675, now seen corresponding path program 40 times [2021-05-02 12:22:14,329 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:22:14,329 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1461562891] [2021-05-02 12:22:14,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:22:14,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:22:15,459 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:22:15,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:22:15,462 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 1075 proven. 1806 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 12:22:15,462 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:22:15,462 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1461562891] [2021-05-02 12:22:15,462 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1461562891] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:22:15,462 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1158457429] [2021-05-02 12:22:15,462 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 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 12:22:15,514 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:22:15,514 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:22:15,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 305 conjuncts, 88 conjunts are in the unsatisfiable core [2021-05-02 12:22:15,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:22:15,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:22:15,780 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:22:15,814 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 1075 proven. 1806 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 12:22:15,814 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1158457429] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:22:15,814 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:22:15,814 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45] total 47 [2021-05-02 12:22:15,815 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90903394] [2021-05-02 12:22:15,815 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 12:22:15,815 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:22:15,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 12:22:15,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2028, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 12:22:15,815 INFO L87 Difference]: Start difference. First operand 123 states and 125 transitions. Second operand has 47 states, 47 states have (on average 2.106382978723404) internal successors, (99), 46 states have internal predecessors, (99), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:22:19,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:22:19,456 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2021-05-02 12:22:19,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 12:22:19,457 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.106382978723404) internal successors, (99), 46 states have internal predecessors, (99), 2 states have call successors, (4), 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 12:22:19,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:22:19,459 INFO L225 Difference]: With dead ends: 158 [2021-05-02 12:22:19,459 INFO L226 Difference]: Without dead ends: 125 [2021-05-02 12:22:19,460 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 121 SyntacticMatches, 2 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 908 ImplicationChecksByTransitivity, 3001.1ms TimeCoverageRelationStatistics Valid=349, Invalid=7661, Unknown=0, NotChecked=0, Total=8010 [2021-05-02 12:22:19,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-02 12:22:19,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2021-05-02 12:22:19,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 120 states have (on average 1.025) internal successors, (123), 120 states have internal predecessors, (123), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:22:19,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 127 transitions. [2021-05-02 12:22:19,467 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 127 transitions. Word has length 121 [2021-05-02 12:22:19,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:22:19,468 INFO L480 AbstractCegarLoop]: Abstraction has 125 states and 127 transitions. [2021-05-02 12:22:19,468 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 2.106382978723404) internal successors, (99), 46 states have internal predecessors, (99), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:22:19,468 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 127 transitions. [2021-05-02 12:22:19,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-05-02 12:22:19,468 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:22:19,468 INFO L523 BasicCegarLoop]: trace histogram [56, 43, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:22:19,676 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,44 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:22:19,677 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:22:19,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:22:19,677 INFO L82 PathProgramCache]: Analyzing trace with hash 1684362016, now seen corresponding path program 41 times [2021-05-02 12:22:19,677 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:22:19,677 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1748700335] [2021-05-02 12:22:19,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:22:19,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:22:20,841 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:22:20,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:22:20,846 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 1100 proven. 1892 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 12:22:20,847 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:22:20,847 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1748700335] [2021-05-02 12:22:20,847 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1748700335] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:22:20,847 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1845524794] [2021-05-02 12:22:20,847 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 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 12:23:06,110 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 57 check-sat command(s) [2021-05-02 12:23:06,110 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:23:06,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 129 conjunts are in the unsatisfiable core [2021-05-02 12:23:06,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:23:07,625 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:23:07,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:23:07,642 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 371 proven. 2756 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 12:23:07,642 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1845524794] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:23:07,642 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:23:07,643 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 55] total 57 [2021-05-02 12:23:07,643 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542968299] [2021-05-02 12:23:07,643 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-02 12:23:07,643 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:23:07,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-02 12:23:07,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=3037, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 12:23:07,644 INFO L87 Difference]: Start difference. First operand 125 states and 127 transitions. Second operand has 57 states, 57 states have (on average 2.087719298245614) internal successors, (119), 56 states have internal predecessors, (119), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:12,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:23:12,164 INFO L93 Difference]: Finished difference Result 160 states and 165 transitions. [2021-05-02 12:23:12,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 12:23:12,165 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.087719298245614) internal successors, (119), 56 states have internal predecessors, (119), 2 states have call successors, (4), 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 12:23:12,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:23:12,165 INFO L225 Difference]: With dead ends: 160 [2021-05-02 12:23:12,165 INFO L226 Difference]: Without dead ends: 127 [2021-05-02 12:23:12,166 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 93 SyntacticMatches, 23 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1012 ImplicationChecksByTransitivity, 4477.9ms TimeCoverageRelationStatistics Valid=375, Invalid=9725, Unknown=0, NotChecked=0, Total=10100 [2021-05-02 12:23:12,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-02 12:23:12,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2021-05-02 12:23:12,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 122 states have (on average 1.0245901639344261) internal successors, (125), 122 states have internal predecessors, (125), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:12,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 129 transitions. [2021-05-02 12:23:12,174 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 129 transitions. Word has length 123 [2021-05-02 12:23:12,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:23:12,174 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 129 transitions. [2021-05-02 12:23:12,174 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 2.087719298245614) internal successors, (119), 56 states have internal predecessors, (119), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:12,174 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 129 transitions. [2021-05-02 12:23:12,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-02 12:23:12,175 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:23:12,175 INFO L523 BasicCegarLoop]: trace histogram [57, 44, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:23:12,388 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-05-02 12:23:12,389 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:23:12,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:23:12,396 INFO L82 PathProgramCache]: Analyzing trace with hash 327057597, now seen corresponding path program 42 times [2021-05-02 12:23:12,396 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:23:12,396 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [369133194] [2021-05-02 12:23:12,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:23:12,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:23:13,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:23:13,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:23:13,744 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 1125 proven. 1980 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 12:23:13,744 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:23:13,744 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [369133194] [2021-05-02 12:23:13,744 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [369133194] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:23:13,744 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1559111342] [2021-05-02 12:23:13,744 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 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 12:23:23,276 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 55 check-sat command(s) [2021-05-02 12:23:23,276 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:23:23,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 12:23:23,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:23:24,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:23:24,352 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 1188 proven. 169 refuted. 0 times theorem prover too weak. 1892 trivial. 0 not checked. [2021-05-02 12:23:24,352 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1559111342] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:23:24,352 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:23:24,352 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 16] total 62 [2021-05-02 12:23:24,353 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125889342] [2021-05-02 12:23:24,353 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-02 12:23:24,353 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:23:24,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-02 12:23:24,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=585, Invalid=3197, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 12:23:24,353 INFO L87 Difference]: Start difference. First operand 127 states and 129 transitions. Second operand has 62 states, 62 states have (on average 2.1129032258064515) internal successors, (131), 61 states have internal predecessors, (131), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:29,059 WARN L205 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 45 [2021-05-02 12:23:31,171 WARN L205 SmtUtils]: Spent 281.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 12:23:33,006 WARN L205 SmtUtils]: Spent 364.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 42 [2021-05-02 12:23:34,798 WARN L205 SmtUtils]: Spent 309.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 12:23:36,126 WARN L205 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-02 12:23:38,092 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 12:23:39,106 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 12:23:42,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:23:42,735 INFO L93 Difference]: Finished difference Result 166 states and 174 transitions. [2021-05-02 12:23:42,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-05-02 12:23:42,736 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.1129032258064515) internal successors, (131), 61 states have internal predecessors, (131), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 125 [2021-05-02 12:23:42,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:23:42,737 INFO L225 Difference]: With dead ends: 166 [2021-05-02 12:23:42,737 INFO L226 Difference]: Without dead ends: 133 [2021-05-02 12:23:42,737 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 126 SyntacticMatches, 1 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1924 ImplicationChecksByTransitivity, 18493.5ms TimeCoverageRelationStatistics Valid=1799, Invalid=12963, Unknown=0, NotChecked=0, Total=14762 [2021-05-02 12:23:42,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-05-02 12:23:42,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 130. [2021-05-02 12:23:42,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 125 states have (on average 1.024) internal successors, (128), 125 states have internal predecessors, (128), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:42,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 132 transitions. [2021-05-02 12:23:42,746 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 132 transitions. Word has length 125 [2021-05-02 12:23:42,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:23:42,746 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 132 transitions. [2021-05-02 12:23:42,746 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 62 states, 62 states have (on average 2.1129032258064515) internal successors, (131), 61 states have internal predecessors, (131), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:42,746 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 132 transitions. [2021-05-02 12:23:42,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-05-02 12:23:42,747 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:23:42,747 INFO L523 BasicCegarLoop]: trace histogram [59, 45, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:23:42,951 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-05-02 12:23:42,951 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:23:42,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:23:42,951 INFO L82 PathProgramCache]: Analyzing trace with hash 1858228725, now seen corresponding path program 43 times [2021-05-02 12:23:42,951 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:23:42,952 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165703306] [2021-05-02 12:23:42,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:23:42,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:23:44,310 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:23:44,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:23:44,316 INFO L134 CoverageAnalysis]: Checked inductivity of 3481 backedges. 1242 proven. 2070 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 12:23:44,316 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:23:44,316 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165703306] [2021-05-02 12:23:44,316 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1165703306] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:23:44,316 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [538144061] [2021-05-02 12:23:44,316 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 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 12:23:44,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:23:44,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 94 conjunts are in the unsatisfiable core [2021-05-02 12:23:44,377 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:23:44,685 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:23:44,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:23:44,727 INFO L134 CoverageAnalysis]: Checked inductivity of 3481 backedges. 1242 proven. 2070 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 12:23:44,728 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [538144061] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:23:44,728 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:23:44,728 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-05-02 12:23:44,728 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1896199275] [2021-05-02 12:23:44,728 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 12:23:44,728 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:23:44,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 12:23:44,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 12:23:44,729 INFO L87 Difference]: Start difference. First operand 130 states and 132 transitions. Second operand has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:49,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:23:49,076 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2021-05-02 12:23:49,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 12:23:49,076 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 2 states have call successors, (4), 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 12:23:49,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:23:49,077 INFO L225 Difference]: With dead ends: 166 [2021-05-02 12:23:49,077 INFO L226 Difference]: Without dead ends: 132 [2021-05-02 12:23:49,077 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 129 SyntacticMatches, 2 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1040 ImplicationChecksByTransitivity, 3514.0ms TimeCoverageRelationStatistics Valid=373, Invalid=8747, Unknown=0, NotChecked=0, Total=9120 [2021-05-02 12:23:49,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-05-02 12:23:49,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2021-05-02 12:23:49,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 127 states have (on average 1.0236220472440944) internal successors, (130), 127 states have internal predecessors, (130), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:49,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 134 transitions. [2021-05-02 12:23:49,086 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 134 transitions. Word has length 129 [2021-05-02 12:23:49,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:23:49,086 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 134 transitions. [2021-05-02 12:23:49,086 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:49,087 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 134 transitions. [2021-05-02 12:23:49,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-02 12:23:49,087 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:23:49,087 INFO L523 BasicCegarLoop]: trace histogram [60, 46, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:23:49,289 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-05-02 12:23:49,289 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:23:49,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:23:49,290 INFO L82 PathProgramCache]: Analyzing trace with hash -1866983982, now seen corresponding path program 44 times [2021-05-02 12:23:49,290 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:23:49,290 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60663322] [2021-05-02 12:23:49,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:23:49,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:23:50,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:23:50,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:23:50,674 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 1269 proven. 2162 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 12:23:50,674 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:23:50,674 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60663322] [2021-05-02 12:23:50,674 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [60663322] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:23:50,674 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2096863098] [2021-05-02 12:23:50,674 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 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 12:23:50,727 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:23:50,728 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:23:50,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 123 conjunts are in the unsatisfiable core [2021-05-02 12:23:50,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:23:51,821 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:23:51,830 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:23:51,830 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2096863098] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:23:51,830 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:23:51,830 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 63] total 65 [2021-05-02 12:23:51,830 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1012043338] [2021-05-02 12:23:51,830 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-02 12:23:51,830 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:23:51,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-02 12:23:51,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=3986, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 12:23:51,831 INFO L87 Difference]: Start difference. First operand 132 states and 134 transitions. Second operand has 65 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 64 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:57,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:23:57,728 INFO L93 Difference]: Finished difference Result 168 states and 173 transitions. [2021-05-02 12:23:57,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 12:23:57,729 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 64 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 131 [2021-05-02 12:23:57,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:23:57,730 INFO L225 Difference]: With dead ends: 168 [2021-05-02 12:23:57,730 INFO L226 Difference]: Without dead ends: 134 [2021-05-02 12:23:57,731 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 118 SyntacticMatches, 1 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1113 ImplicationChecksByTransitivity, 4723.6ms TimeCoverageRelationStatistics Valid=409, Invalid=12023, Unknown=0, NotChecked=0, Total=12432 [2021-05-02 12:23:57,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-05-02 12:23:57,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 134. [2021-05-02 12:23:57,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 129 states have (on average 1.0232558139534884) internal successors, (132), 129 states have internal predecessors, (132), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:57,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 136 transitions. [2021-05-02 12:23:57,740 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 136 transitions. Word has length 131 [2021-05-02 12:23:57,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:23:57,740 INFO L480 AbstractCegarLoop]: Abstraction has 134 states and 136 transitions. [2021-05-02 12:23:57,740 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 64 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:57,740 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 136 transitions. [2021-05-02 12:23:57,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-05-02 12:23:57,741 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:23:57,741 INFO L523 BasicCegarLoop]: trace histogram [61, 47, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:23:57,941 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:23:57,941 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:23:57,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:23:57,942 INFO L82 PathProgramCache]: Analyzing trace with hash 206329455, now seen corresponding path program 45 times [2021-05-02 12:23:57,942 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:23:57,942 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1581327549] [2021-05-02 12:23:57,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:23:57,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:23:59,385 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:23:59,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:23:59,389 INFO L134 CoverageAnalysis]: Checked inductivity of 3721 backedges. 1296 proven. 2256 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 12:23:59,389 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:23:59,389 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1581327549] [2021-05-02 12:23:59,390 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1581327549] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:23:59,390 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1709835637] [2021-05-02 12:23:59,390 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 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 12:23:59,917 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2021-05-02 12:23:59,917 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:23:59,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 48 conjunts are in the unsatisfiable core [2021-05-02 12:23:59,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:24:03,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:03,444 INFO L134 CoverageAnalysis]: Checked inductivity of 3721 backedges. 1363 proven. 196 refuted. 0 times theorem prover too weak. 2162 trivial. 0 not checked. [2021-05-02 12:24:03,444 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1709835637] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:24:03,444 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:24:03,444 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 17] total 66 [2021-05-02 12:24:03,444 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213208967] [2021-05-02 12:24:03,444 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-02 12:24:03,445 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:24:03,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-02 12:24:03,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=456, Invalid=3834, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 12:24:03,445 INFO L87 Difference]: Start difference. First operand 134 states and 136 transitions. Second operand has 66 states, 66 states have (on average 2.106060606060606) internal successors, (139), 65 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:24:09,849 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 12:24:10,770 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 12:24:12,005 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 12:24:13,860 WARN L205 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 12:24:16,492 WARN L205 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-02 12:24:19,281 WARN L205 SmtUtils]: Spent 371.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 12:24:22,793 WARN L205 SmtUtils]: Spent 438.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 42 [2021-05-02 12:24:27,781 WARN L205 SmtUtils]: Spent 424.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 12:24:33,576 WARN L205 SmtUtils]: Spent 557.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 12:24:37,966 WARN L205 SmtUtils]: Spent 334.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 12:24:40,518 WARN L205 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 12:24:42,064 WARN L205 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 12:24:44,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:24:44,072 INFO L93 Difference]: Finished difference Result 175 states and 184 transitions. [2021-05-02 12:24:44,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-05-02 12:24:44,073 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 2.106060606060606) internal successors, (139), 65 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 133 [2021-05-02 12:24:44,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:24:44,073 INFO L225 Difference]: With dead ends: 175 [2021-05-02 12:24:44,073 INFO L226 Difference]: Without dead ends: 141 [2021-05-02 12:24:44,074 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 127 SyntacticMatches, 8 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2172 ImplicationChecksByTransitivity, 41541.5ms TimeCoverageRelationStatistics Valid=1253, Invalid=15517, Unknown=0, NotChecked=0, Total=16770 [2021-05-02 12:24:44,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-02 12:24:44,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 139. [2021-05-02 12:24:44,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.0223880597014925) internal successors, (137), 134 states have internal predecessors, (137), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:24:44,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 141 transitions. [2021-05-02 12:24:44,084 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 141 transitions. Word has length 133 [2021-05-02 12:24:44,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:24:44,084 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 141 transitions. [2021-05-02 12:24:44,084 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 66 states, 66 states have (on average 2.106060606060606) internal successors, (139), 65 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:24:44,084 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 141 transitions. [2021-05-02 12:24:44,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-02 12:24:44,084 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:24:44,084 INFO L523 BasicCegarLoop]: trace histogram [63, 48, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:24:44,287 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-05-02 12:24:44,288 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:24:44,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:24:44,288 INFO L82 PathProgramCache]: Analyzing trace with hash -1909778905, now seen corresponding path program 46 times [2021-05-02 12:24:44,288 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:24:44,288 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [248655617] [2021-05-02 12:24:44,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:24:44,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:24:46,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:24:46,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:24:46,099 INFO L134 CoverageAnalysis]: Checked inductivity of 3969 backedges. 1421 proven. 2352 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 12:24:46,099 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:24:46,099 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [248655617] [2021-05-02 12:24:46,099 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [248655617] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:24:46,099 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [773576555] [2021-05-02 12:24:46,099 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 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 12:24:46,167 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:24:46,168 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:24:46,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 100 conjunts are in the unsatisfiable core [2021-05-02 12:24:46,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:24:46,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:46,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:46,610 INFO L134 CoverageAnalysis]: Checked inductivity of 3969 backedges. 1421 proven. 2352 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 12:24:46,611 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [773576555] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:24:46,611 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:24:46,611 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51] total 53 [2021-05-02 12:24:46,611 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304642449] [2021-05-02 12:24:46,611 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-02 12:24:46,611 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:24:46,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-02 12:24:46,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=2604, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 12:24:46,612 INFO L87 Difference]: Start difference. First operand 139 states and 141 transitions. Second operand has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:24:52,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:24:52,595 INFO L93 Difference]: Finished difference Result 178 states and 183 transitions. [2021-05-02 12:24:52,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-02 12:24:52,596 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 2 states have call successors, (4), 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 137 [2021-05-02 12:24:52,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:24:52,596 INFO L225 Difference]: With dead ends: 178 [2021-05-02 12:24:52,596 INFO L226 Difference]: Without dead ends: 141 [2021-05-02 12:24:52,597 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 137 SyntacticMatches, 2 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1181 ImplicationChecksByTransitivity, 4515.9ms TimeCoverageRelationStatistics Valid=397, Invalid=9905, Unknown=0, NotChecked=0, Total=10302 [2021-05-02 12:24:52,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-02 12:24:52,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 141. [2021-05-02 12:24:52,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 136 states have (on average 1.0220588235294117) internal successors, (139), 136 states have internal predecessors, (139), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:24:52,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 143 transitions. [2021-05-02 12:24:52,607 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 143 transitions. Word has length 137 [2021-05-02 12:24:52,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:24:52,607 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 143 transitions. [2021-05-02 12:24:52,607 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:24:52,607 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 143 transitions. [2021-05-02 12:24:52,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-05-02 12:24:52,608 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:24:52,608 INFO L523 BasicCegarLoop]: trace histogram [64, 49, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:24:52,823 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,50 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:24:52,823 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:24:52,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:24:52,823 INFO L82 PathProgramCache]: Analyzing trace with hash 180464900, now seen corresponding path program 47 times [2021-05-02 12:24:52,823 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:24:52,823 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [608215904] [2021-05-02 12:24:52,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:24:52,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:24:54,697 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:24:54,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:24:54,704 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 1450 proven. 2450 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 12:24:54,704 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:24:54,704 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [608215904] [2021-05-02 12:24:54,704 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [608215904] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:24:54,704 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1256482342] [2021-05-02 12:24:54,704 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 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 12:26:17,586 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 65 check-sat command(s) [2021-05-02 12:26:17,586 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:26:17,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 167 conjunts are in the unsatisfiable core [2021-05-02 12:26:17,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:26:20,347 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 1450 proven. 2450 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 12:26:20,348 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1256482342] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:26:20,348 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:26:20,348 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 52] total 54 [2021-05-02 12:26:20,348 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691962048] [2021-05-02 12:26:20,348 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-02 12:26:20,348 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:26:20,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-02 12:26:20,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=2707, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 12:26:20,349 INFO L87 Difference]: Start difference. First operand 141 states and 143 transitions. Second operand has 54 states, 54 states have (on average 2.0925925925925926) internal successors, (113), 53 states have internal predecessors, (113), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:26:26,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:26:26,798 INFO L93 Difference]: Finished difference Result 180 states and 185 transitions. [2021-05-02 12:26:26,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 12:26:26,799 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.0925925925925926) internal successors, (113), 53 states have internal predecessors, (113), 2 states have call successors, (4), 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 139 [2021-05-02 12:26:26,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:26:26,800 INFO L225 Difference]: With dead ends: 180 [2021-05-02 12:26:26,800 INFO L226 Difference]: Without dead ends: 143 [2021-05-02 12:26:26,800 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 94 SyntacticMatches, 47 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1318 ImplicationChecksByTransitivity, 7129.0ms TimeCoverageRelationStatistics Valid=405, Invalid=10307, Unknown=0, NotChecked=0, Total=10712 [2021-05-02 12:26:26,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-05-02 12:26:26,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 143. [2021-05-02 12:26:26,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 138 states have (on average 1.0217391304347827) internal successors, (141), 138 states have internal predecessors, (141), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:26:26,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2021-05-02 12:26:26,811 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 139 [2021-05-02 12:26:26,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:26:26,811 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2021-05-02 12:26:26,811 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 2.0925925925925926) internal successors, (113), 53 states have internal predecessors, (113), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:26:26,811 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2021-05-02 12:26:26,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-05-02 12:26:26,811 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:26:26,811 INFO L523 BasicCegarLoop]: trace histogram [65, 50, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:26:27,012 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,51 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:26:27,013 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:26:27,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:26:27,013 INFO L82 PathProgramCache]: Analyzing trace with hash -1139933023, now seen corresponding path program 48 times [2021-05-02 12:26:27,013 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:26:27,013 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [813944409] [2021-05-02 12:26:27,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:26:27,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:26:28,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:26:28,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:26:28,975 INFO L134 CoverageAnalysis]: Checked inductivity of 4225 backedges. 1479 proven. 2550 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 12:26:28,975 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:26:28,975 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [813944409] [2021-05-02 12:26:28,976 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [813944409] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:26:28,976 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [832842895] [2021-05-02 12:26:28,976 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 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 12:26:56,025 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 63 check-sat command(s) [2021-05-02 12:26:56,025 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:26:56,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 152 conjunts are in the unsatisfiable core [2021-05-02 12:26:56,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:26:56,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:26:56,150 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:26:56,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:27:00,154 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:27:00,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:27:00,164 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:27:00,166 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:27:09,122 INFO L134 CoverageAnalysis]: Checked inductivity of 4225 backedges. 1456 proven. 2305 refuted. 0 times theorem prover too weak. 464 trivial. 0 not checked. [2021-05-02 12:27:09,123 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [832842895] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:27:09,123 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:27:09,123 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 45] total 87 [2021-05-02 12:27:09,123 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [162156273] [2021-05-02 12:27:09,123 INFO L460 AbstractCegarLoop]: Interpolant automaton has 87 states [2021-05-02 12:27:09,123 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:27:09,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-05-02 12:27:09,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1103, Invalid=6379, Unknown=0, NotChecked=0, Total=7482 [2021-05-02 12:27:09,124 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand has 87 states, 87 states have (on average 2.0919540229885056) internal successors, (182), 86 states have internal predecessors, (182), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:27:29,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:27:29,825 INFO L93 Difference]: Finished difference Result 218 states and 242 transitions. [2021-05-02 12:27:29,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-05-02 12:27:29,826 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 2.0919540229885056) internal successors, (182), 86 states have internal predecessors, (182), 2 states have call successors, (4), 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 141 [2021-05-02 12:27:29,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:27:29,826 INFO L225 Difference]: With dead ends: 218 [2021-05-02 12:27:29,826 INFO L226 Difference]: Without dead ends: 181 [2021-05-02 12:27:29,827 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 106 SyntacticMatches, 21 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5154 ImplicationChecksByTransitivity, 26083.8ms TimeCoverageRelationStatistics Valid=3321, Invalid=25749, Unknown=0, NotChecked=0, Total=29070 [2021-05-02 12:27:29,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2021-05-02 12:27:29,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 147. [2021-05-02 12:27:29,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 142 states have (on average 1.0211267605633803) internal successors, (145), 142 states have internal predecessors, (145), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:27:29,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 149 transitions. [2021-05-02 12:27:29,838 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 149 transitions. Word has length 141 [2021-05-02 12:27:29,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:27:29,838 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 149 transitions. [2021-05-02 12:27:29,838 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 87 states, 87 states have (on average 2.0919540229885056) internal successors, (182), 86 states have internal predecessors, (182), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:27:29,838 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 149 transitions. [2021-05-02 12:27:29,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-05-02 12:27:29,839 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:27:29,839 INFO L523 BasicCegarLoop]: trace histogram [67, 51, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:27:30,044 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-05-02 12:27:30,044 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:27:30,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:27:30,044 INFO L82 PathProgramCache]: Analyzing trace with hash -106852647, now seen corresponding path program 49 times [2021-05-02 12:27:30,044 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:27:30,044 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [579115569] [2021-05-02 12:27:30,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:27:30,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:27:32,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:27:32,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:27:32,452 INFO L134 CoverageAnalysis]: Checked inductivity of 4489 backedges. 1612 proven. 2652 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-02 12:27:32,452 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:27:32,452 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [579115569] [2021-05-02 12:27:32,452 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [579115569] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:27:32,452 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [618318115] [2021-05-02 12:27:32,452 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 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 12:27:32,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:27:32,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 353 conjuncts, 106 conjunts are in the unsatisfiable core [2021-05-02 12:27:32,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:27:33,075 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:27:33,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:27:33,157 INFO L134 CoverageAnalysis]: Checked inductivity of 4489 backedges. 1612 proven. 2652 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-02 12:27:33,157 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [618318115] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:27:33,158 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:27:33,158 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54] total 56 [2021-05-02 12:27:33,158 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036102654] [2021-05-02 12:27:33,158 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-02 12:27:33,158 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:27:33,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-02 12:27:33,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=2919, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 12:27:33,159 INFO L87 Difference]: Start difference. First operand 147 states and 149 transitions. Second operand has 56 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 55 states have internal predecessors, (117), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:27:41,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:27:41,645 INFO L93 Difference]: Finished difference Result 188 states and 193 transitions. [2021-05-02 12:27:41,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 12:27:41,647 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 55 states have internal predecessors, (117), 2 states have call successors, (4), 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 145 [2021-05-02 12:27:41,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:27:41,647 INFO L225 Difference]: With dead ends: 188 [2021-05-02 12:27:41,647 INFO L226 Difference]: Without dead ends: 149 [2021-05-02 12:27:41,648 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 145 SyntacticMatches, 2 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1331 ImplicationChecksByTransitivity, 6132.1ms TimeCoverageRelationStatistics Valid=421, Invalid=11135, Unknown=0, NotChecked=0, Total=11556 [2021-05-02 12:27:41,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-02 12:27:41,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2021-05-02 12:27:41,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 144 states have (on average 1.0208333333333333) internal successors, (147), 144 states have internal predecessors, (147), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:27:41,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 151 transitions. [2021-05-02 12:27:41,659 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 151 transitions. Word has length 145 [2021-05-02 12:27:41,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:27:41,659 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 151 transitions. [2021-05-02 12:27:41,659 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 55 states have internal predecessors, (117), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:27:41,659 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 151 transitions. [2021-05-02 12:27:41,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-05-02 12:27:41,660 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:27:41,660 INFO L523 BasicCegarLoop]: trace histogram [68, 52, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:27:41,860 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,53 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:27:41,860 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:27:41,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:27:41,861 INFO L82 PathProgramCache]: Analyzing trace with hash -1739196234, now seen corresponding path program 50 times [2021-05-02 12:27:41,861 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:27:41,861 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [851502248] [2021-05-02 12:27:41,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:27:41,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:27:44,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:27:44,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:27:44,469 INFO L134 CoverageAnalysis]: Checked inductivity of 4624 backedges. 1643 proven. 2756 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-02 12:27:44,470 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:27:44,470 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [851502248] [2021-05-02 12:27:44,470 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [851502248] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:27:44,470 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [677649119] [2021-05-02 12:27:44,470 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 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 12:27:44,527 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:27:44,527 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:27:44,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 139 conjunts are in the unsatisfiable core [2021-05-02 12:27:44,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:27:46,641 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:27:46,655 INFO L134 CoverageAnalysis]: Checked inductivity of 4624 backedges. 0 proven. 4624 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:27:46,655 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [677649119] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:27:46,655 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:27:46,656 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 71] total 73 [2021-05-02 12:27:46,656 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647766700] [2021-05-02 12:27:46,656 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2021-05-02 12:27:46,656 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:27:46,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-05-02 12:27:46,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=5060, Unknown=0, NotChecked=0, Total=5256 [2021-05-02 12:27:46,657 INFO L87 Difference]: Start difference. First operand 149 states and 151 transitions. Second operand has 73 states, 73 states have (on average 2.0547945205479454) internal successors, (150), 72 states have internal predecessors, (150), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:27:58,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:27:58,128 INFO L93 Difference]: Finished difference Result 190 states and 195 transitions. [2021-05-02 12:27:58,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-02 12:27:58,129 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 2.0547945205479454) internal successors, (150), 72 states have internal predecessors, (150), 2 states have call successors, (4), 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 147 [2021-05-02 12:27:58,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:27:58,130 INFO L225 Difference]: With dead ends: 190 [2021-05-02 12:27:58,130 INFO L226 Difference]: Without dead ends: 151 [2021-05-02 12:27:58,130 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 132 SyntacticMatches, 1 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1414 ImplicationChecksByTransitivity, 8665.0ms TimeCoverageRelationStatistics Valid=461, Invalid=15289, Unknown=0, NotChecked=0, Total=15750 [2021-05-02 12:27:58,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-05-02 12:27:58,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2021-05-02 12:27:58,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 146 states have (on average 1.0205479452054795) internal successors, (149), 146 states have internal predecessors, (149), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:27:58,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 153 transitions. [2021-05-02 12:27:58,142 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 153 transitions. Word has length 147 [2021-05-02 12:27:58,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:27:58,142 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 153 transitions. [2021-05-02 12:27:58,142 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 73 states, 73 states have (on average 2.0547945205479454) internal successors, (150), 72 states have internal predecessors, (150), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:27:58,142 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 153 transitions. [2021-05-02 12:27:58,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-05-02 12:27:58,143 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:27:58,143 INFO L523 BasicCegarLoop]: trace histogram [69, 53, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:27:58,355 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-05-02 12:27:58,356 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:27:58,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:27:58,356 INFO L82 PathProgramCache]: Analyzing trace with hash 1536646995, now seen corresponding path program 51 times [2021-05-02 12:27:58,356 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:27:58,356 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [367159112] [2021-05-02 12:27:58,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:27:58,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:28:00,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:28:00,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:28:00,902 INFO L134 CoverageAnalysis]: Checked inductivity of 4761 backedges. 1674 proven. 2862 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-02 12:28:00,902 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:28:00,902 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [367159112] [2021-05-02 12:28:00,902 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [367159112] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:28:00,902 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2126705605] [2021-05-02 12:28:00,902 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 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 12:28:01,635 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2021-05-02 12:28:01,635 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:28:01,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 86 conjunts are in the unsatisfiable core [2021-05-02 12:28:01,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:28:01,712 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:28:01,714 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:28:01,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:28:01,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:28:01,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:28:01,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:28:01,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:28:13,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:28:13,607 INFO L134 CoverageAnalysis]: Checked inductivity of 4761 backedges. 1518 proven. 1173 refuted. 0 times theorem prover too weak. 2070 trivial. 0 not checked. [2021-05-02 12:28:13,607 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2126705605] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:28:13,607 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:28:13,607 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 26] total 74 [2021-05-02 12:28:13,608 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562843915] [2021-05-02 12:28:13,608 INFO L460 AbstractCegarLoop]: Interpolant automaton has 74 states [2021-05-02 12:28:13,608 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:28:13,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-05-02 12:28:13,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=5152, Unknown=0, NotChecked=0, Total=5402 [2021-05-02 12:28:13,608 INFO L87 Difference]: Start difference. First operand 151 states and 153 transitions. Second operand has 74 states, 74 states have (on average 2.0945945945945947) internal successors, (155), 73 states have internal predecessors, (155), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:28:37,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:28:37,562 INFO L93 Difference]: Finished difference Result 194 states and 201 transitions. [2021-05-02 12:28:37,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-05-02 12:28:37,565 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 2.0945945945945947) internal successors, (155), 73 states have internal predecessors, (155), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 149 [2021-05-02 12:28:37,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:28:37,565 INFO L225 Difference]: With dead ends: 194 [2021-05-02 12:28:37,565 INFO L226 Difference]: Without dead ends: 155 [2021-05-02 12:28:37,567 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 135 SyntacticMatches, 17 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2552 ImplicationChecksByTransitivity, 23912.4ms TimeCoverageRelationStatistics Valid=745, Invalid=20135, Unknown=0, NotChecked=0, Total=20880 [2021-05-02 12:28:37,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-05-02 12:28:37,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 155. [2021-05-02 12:28:37,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 150 states have (on average 1.02) internal successors, (153), 150 states have internal predecessors, (153), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:28:37,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 157 transitions. [2021-05-02 12:28:37,579 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 157 transitions. Word has length 149 [2021-05-02 12:28:37,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:28:37,579 INFO L480 AbstractCegarLoop]: Abstraction has 155 states and 157 transitions. [2021-05-02 12:28:37,579 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 74 states, 74 states have (on average 2.0945945945945947) internal successors, (155), 73 states have internal predecessors, (155), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:28:37,579 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 157 transitions. [2021-05-02 12:28:37,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2021-05-02 12:28:37,580 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:28:37,580 INFO L523 BasicCegarLoop]: trace histogram [71, 54, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:28:37,780 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-05-02 12:28:37,780 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:28:37,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:28:37,780 INFO L82 PathProgramCache]: Analyzing trace with hash -142500853, now seen corresponding path program 52 times [2021-05-02 12:28:37,780 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:28:37,781 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [734806354] [2021-05-02 12:28:37,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:28:37,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:28:40,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:28:40,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:28:40,894 INFO L134 CoverageAnalysis]: Checked inductivity of 5041 backedges. 1815 proven. 2970 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 12:28:40,895 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:28:40,895 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [734806354] [2021-05-02 12:28:40,895 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [734806354] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:28:40,895 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [242596269] [2021-05-02 12:28:40,895 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 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 12:28:40,962 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:28:40,962 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:28:40,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 112 conjunts are in the unsatisfiable core [2021-05-02 12:28:40,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:28:41,701 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:28:41,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:28:41,805 INFO L134 CoverageAnalysis]: Checked inductivity of 5041 backedges. 1815 proven. 2970 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 12:28:41,806 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [242596269] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:28:41,806 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:28:41,806 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 57] total 59 [2021-05-02 12:28:41,806 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324159565] [2021-05-02 12:28:41,806 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-02 12:28:41,806 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:28:41,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-02 12:28:41,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=3252, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 12:28:41,807 INFO L87 Difference]: Start difference. First operand 155 states and 157 transitions. Second operand has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:28:54,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:28:54,357 INFO L93 Difference]: Finished difference Result 198 states and 203 transitions. [2021-05-02 12:28:54,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-02 12:28:54,359 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 2 states have call successors, (4), 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 153 [2021-05-02 12:28:54,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:28:54,360 INFO L225 Difference]: With dead ends: 198 [2021-05-02 12:28:54,360 INFO L226 Difference]: Without dead ends: 157 [2021-05-02 12:28:54,361 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 153 SyntacticMatches, 2 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1490 ImplicationChecksByTransitivity, 8276.1ms TimeCoverageRelationStatistics Valid=445, Invalid=12437, Unknown=0, NotChecked=0, Total=12882 [2021-05-02 12:28:54,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-05-02 12:28:54,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2021-05-02 12:28:54,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 152 states have (on average 1.019736842105263) internal successors, (155), 152 states have internal predecessors, (155), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:28:54,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 159 transitions. [2021-05-02 12:28:54,373 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 159 transitions. Word has length 153 [2021-05-02 12:28:54,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:28:54,373 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 159 transitions. [2021-05-02 12:28:54,374 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:28:54,374 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 159 transitions. [2021-05-02 12:28:54,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-05-02 12:28:54,374 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:28:54,374 INFO L523 BasicCegarLoop]: trace histogram [72, 55, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:28:54,576 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,56 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:28:54,577 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:28:54,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:28:54,577 INFO L82 PathProgramCache]: Analyzing trace with hash -1294935832, now seen corresponding path program 53 times [2021-05-02 12:28:54,577 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:28:54,577 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1324178974] [2021-05-02 12:28:54,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:28:54,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:28:58,155 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:28:58,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:28:58,160 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 1848 proven. 3080 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 12:28:58,160 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:28:58,160 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1324178974] [2021-05-02 12:28:58,160 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1324178974] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:28:58,160 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2137494080] [2021-05-02 12:28:58,160 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 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 12:30:38,037 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 73 check-sat command(s) [2021-05-02 12:30:38,038 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:30:38,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 133 conjunts are in the unsatisfiable core [2021-05-02 12:30:38,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:30:40,605 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:30:40,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:30:40,713 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 1767 proven. 3192 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-02 12:30:40,713 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2137494080] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:30:40,713 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:30:40,713 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59] total 61 [2021-05-02 12:30:40,713 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [323566689] [2021-05-02 12:30:40,714 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2021-05-02 12:30:40,714 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:30:40,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-05-02 12:30:40,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=3485, Unknown=0, NotChecked=0, Total=3660 [2021-05-02 12:30:40,714 INFO L87 Difference]: Start difference. First operand 157 states and 159 transitions. Second operand has 61 states, 61 states have (on average 2.081967213114754) internal successors, (127), 60 states have internal predecessors, (127), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:30:53,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:30:53,614 INFO L93 Difference]: Finished difference Result 200 states and 205 transitions. [2021-05-02 12:30:53,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-02 12:30:53,616 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.081967213114754) internal successors, (127), 60 states have internal predecessors, (127), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 155 [2021-05-02 12:30:53,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:30:53,617 INFO L225 Difference]: With dead ends: 200 [2021-05-02 12:30:53,617 INFO L226 Difference]: Without dead ends: 159 [2021-05-02 12:30:53,618 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 137 SyntacticMatches, 19 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1582 ImplicationChecksByTransitivity, 10752.7ms TimeCoverageRelationStatistics Valid=455, Invalid=13117, Unknown=0, NotChecked=0, Total=13572 [2021-05-02 12:30:53,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-05-02 12:30:53,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2021-05-02 12:30:53,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 154 states have (on average 1.0194805194805194) internal successors, (157), 154 states have internal predecessors, (157), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:30:53,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 161 transitions. [2021-05-02 12:30:53,631 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 161 transitions. Word has length 155 [2021-05-02 12:30:53,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:30:53,631 INFO L480 AbstractCegarLoop]: Abstraction has 159 states and 161 transitions. [2021-05-02 12:30:53,631 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 61 states, 61 states have (on average 2.081967213114754) internal successors, (127), 60 states have internal predecessors, (127), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:30:53,631 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 161 transitions. [2021-05-02 12:30:53,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-05-02 12:30:53,631 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:30:53,631 INFO L523 BasicCegarLoop]: trace histogram [73, 56, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:30:53,834 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-05-02 12:30:53,834 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:30:53,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:30:53,835 INFO L82 PathProgramCache]: Analyzing trace with hash -683388283, now seen corresponding path program 54 times [2021-05-02 12:30:53,835 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:30:53,835 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [16794030] [2021-05-02 12:30:53,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:30:53,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:30:57,651 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:30:57,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:30:57,656 INFO L134 CoverageAnalysis]: Checked inductivity of 5329 backedges. 1881 proven. 3192 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 12:30:57,656 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:30:57,656 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [16794030] [2021-05-02 12:30:57,656 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [16794030] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:30:57,656 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2114392680] [2021-05-02 12:30:57,656 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 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 12:31:38,053 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 71 check-sat command(s) [2021-05-02 12:31:38,053 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:31:38,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-02 12:31:38,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:31:46,080 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:31:46,099 INFO L134 CoverageAnalysis]: Checked inductivity of 5329 backedges. 1960 proven. 289 refuted. 0 times theorem prover too weak. 3080 trivial. 0 not checked. [2021-05-02 12:31:46,099 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2114392680] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:31:46,099 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:31:46,099 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 20] total 78 [2021-05-02 12:31:46,099 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979335356] [2021-05-02 12:31:46,099 INFO L460 AbstractCegarLoop]: Interpolant automaton has 78 states [2021-05-02 12:31:46,100 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:31:46,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2021-05-02 12:31:46,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=509, Invalid=5497, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 12:31:46,100 INFO L87 Difference]: Start difference. First operand 159 states and 161 transitions. Second operand has 78 states, 78 states have (on average 2.08974358974359) internal successors, (163), 77 states have internal predecessors, (163), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:32:04,183 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 45 [2021-05-02 12:32:05,101 WARN L205 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 12:32:06,775 WARN L205 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 12:32:08,921 WARN L205 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 12:32:11,402 WARN L205 SmtUtils]: Spent 398.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 12:32:14,841 WARN L205 SmtUtils]: Spent 546.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 12:32:19,908 WARN L205 SmtUtils]: Spent 590.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-02 12:32:27,332 WARN L205 SmtUtils]: Spent 492.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 12:32:33,017 WARN L205 SmtUtils]: Spent 605.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 12:32:41,483 WARN L205 SmtUtils]: Spent 862.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 12:32:48,655 WARN L205 SmtUtils]: Spent 466.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 12:32:56,527 WARN L205 SmtUtils]: Spent 785.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 12:33:04,304 WARN L205 SmtUtils]: Spent 897.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42