/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/sum04-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 11:51:53,403 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 11:51:53,404 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 11:51:53,422 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 11:51:53,422 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 11:51:53,423 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 11:51:53,424 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 11:51:53,425 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 11:51:53,426 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 11:51:53,427 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 11:51:53,427 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 11:51:53,428 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 11:51:53,428 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 11:51:53,429 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 11:51:53,430 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 11:51:53,430 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 11:51:53,431 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 11:51:53,431 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 11:51:53,432 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 11:51:53,434 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 11:51:53,435 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 11:51:53,435 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 11:51:53,436 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 11:51:53,436 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 11:51:53,438 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-02 11:51:53,438 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-02 11:51:53,438 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-02 11:51:53,439 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-02 11:51:53,439 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-02 11:51:53,440 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-02 11:51:53,440 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-02 11:51:53,440 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-02 11:51:53,441 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-02 11:51:53,441 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-02 11:51:53,442 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-02 11:51:53,442 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-02 11:51:53,442 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-02 11:51:53,443 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-02 11:51:53,443 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 11:51:53,443 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 11:51:53,444 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 11:51:53,444 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 11:51:53,473 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 11:51:53,473 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 11:51:53,476 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 11:51:53,476 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 11:51:53,476 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 11:51:53,476 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 11:51:53,476 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 11:51:53,476 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 11:51:53,476 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 11:51:53,476 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 11:51:53,477 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 11:51:53,477 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 11:51:53,477 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 11:51:53,477 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 11:51:53,477 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 11:51:53,477 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 11:51:53,477 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 11:51:53,478 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 11:51:53,478 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 11:51:53,478 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 11:51:53,478 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 11:51:53,478 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 11:51:53,478 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 11:51:53,478 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 11:51:53,478 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 11:51:53,478 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 11:51:53,478 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 11:51:53,479 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 11:51:53,479 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 11:51:53,757 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 11:51:53,770 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 11:51:53,771 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 11:51:53,772 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 11:51:53,772 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 11:51:53,773 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum04-1.i [2021-05-02 11:51:53,830 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2e9cf3953/0fb072d202ba4b779d576ec9a5bd16f5/FLAGe16a2d185 [2021-05-02 11:51:54,178 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 11:51:54,178 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum04-1.i [2021-05-02 11:51:54,182 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2e9cf3953/0fb072d202ba4b779d576ec9a5bd16f5/FLAGe16a2d185 [2021-05-02 11:51:54,196 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2e9cf3953/0fb072d202ba4b779d576ec9a5bd16f5 [2021-05-02 11:51:54,198 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 11:51:54,200 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 11:51:54,202 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 11:51:54,202 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 11:51:54,204 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 11:51:54,205 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:51:54" (1/1) ... [2021-05-02 11:51:54,205 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d0240a3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:54, skipping insertion in model container [2021-05-02 11:51:54,205 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:51:54" (1/1) ... [2021-05-02 11:51:54,212 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 11:51:54,220 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 11:51:54,297 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/sum04-1.i[808,821] [2021-05-02 11:51:54,302 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 11:51:54,306 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 11:51:54,314 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/sum04-1.i[808,821] [2021-05-02 11:51:54,315 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 11:51:54,329 INFO L208 MainTranslator]: Completed translation [2021-05-02 11:51:54,329 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:54 WrapperNode [2021-05-02 11:51:54,329 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 11:51:54,330 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 11:51:54,330 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 11:51:54,337 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 11:51:54,359 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:54" (1/1) ... [2021-05-02 11:51:54,359 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:54" (1/1) ... [2021-05-02 11:51:54,363 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:54" (1/1) ... [2021-05-02 11:51:54,363 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:54" (1/1) ... [2021-05-02 11:51:54,365 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:54" (1/1) ... [2021-05-02 11:51:54,367 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:54" (1/1) ... [2021-05-02 11:51:54,368 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:54" (1/1) ... [2021-05-02 11:51:54,369 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 11:51:54,369 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 11:51:54,370 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 11:51:54,370 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 11:51:54,370 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:54" (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 11:51:54,432 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 11:51:54,432 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 11:51:54,432 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 11:51:54,433 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 11:51:54,433 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 11:51:54,433 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 11:51:54,433 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 11:51:54,433 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 11:51:54,434 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 11:51:54,434 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 11:51:54,434 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 11:51:54,434 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 11:51:54,434 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 11:51:54,434 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 11:51:54,435 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 11:51:54,435 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 11:51:54,435 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 11:51:54,435 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 11:51:54,435 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 11:51:54,587 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 11:51:54,588 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 11:51:54,589 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:51:54 BoogieIcfgContainer [2021-05-02 11:51:54,589 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 11:51:54,590 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 11:51:54,590 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 11:51:54,592 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 11:51:54,592 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 11:51:54" (1/3) ... [2021-05-02 11:51:54,592 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75317bd8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:51:54, skipping insertion in model container [2021-05-02 11:51:54,592 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:54" (2/3) ... [2021-05-02 11:51:54,593 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75317bd8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:51:54, skipping insertion in model container [2021-05-02 11:51:54,593 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:51:54" (3/3) ... [2021-05-02 11:51:54,594 INFO L111 eAbstractionObserver]: Analyzing ICFG sum04-1.i [2021-05-02 11:51:54,597 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 11:51:54,599 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 11:51:54,610 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 11:51:54,629 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 11:51:54,629 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 11:51:54,629 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 11:51:54,629 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 11:51:54,629 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 11:51:54,629 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 11:51:54,629 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 11:51:54,629 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 11:51:54,639 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 11:51:54,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 11:51:54,642 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:54,642 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:54,642 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:54,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:54,646 INFO L82 PathProgramCache]: Analyzing trace with hash 1466806487, now seen corresponding path program 1 times [2021-05-02 11:51:54,651 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:54,651 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [157299610] [2021-05-02 11:51:54,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:54,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:54,786 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:54,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:54,797 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 11:51:54,797 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:54,797 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [157299610] [2021-05-02 11:51:54,798 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [157299610] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:51:54,798 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:51:54,798 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 11:51:54,798 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [74656036] [2021-05-02 11:51:54,801 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 11:51:54,801 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:54,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 11:51:54,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 11:51:54,810 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:54,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:54,844 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-05-02 11:51:54,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 11:51:54,845 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 11:51:54,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:54,849 INFO L225 Difference]: With dead ends: 31 [2021-05-02 11:51:54,849 INFO L226 Difference]: Without dead ends: 14 [2021-05-02 11:51:54,851 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 20.5ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 11:51:54,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-02 11:51:54,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-02 11:51:54,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:54,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-05-02 11:51:54,873 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2021-05-02 11:51:54,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:54,873 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-05-02 11:51:54,873 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 11:51:54,873 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-05-02 11:51:54,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 11:51:54,874 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:54,874 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:54,874 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 11:51:54,874 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:54,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:54,875 INFO L82 PathProgramCache]: Analyzing trace with hash 1456647756, now seen corresponding path program 1 times [2021-05-02 11:51:54,875 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:54,875 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1963204095] [2021-05-02 11:51:54,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:54,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:54,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:54,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:54,935 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 11:51:54,935 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:54,935 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1963204095] [2021-05-02 11:51:54,935 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1963204095] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:51:54,935 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:51:54,935 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 11:51:54,936 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513156983] [2021-05-02 11:51:54,936 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 11:51:54,937 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:54,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 11:51:54,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 11:51:54,938 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:54,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:54,976 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2021-05-02 11:51:54,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 11:51:54,977 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 11:51:54,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:54,977 INFO L225 Difference]: With dead ends: 25 [2021-05-02 11:51:54,977 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 11:51:54,978 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 34.0ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 11:51:54,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 11:51:54,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-05-02 11:51:54,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:54,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-05-02 11:51:54,985 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2021-05-02 11:51:54,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:54,985 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-05-02 11:51:54,985 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 11:51:54,985 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-05-02 11:51:54,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 11:51:54,986 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:54,986 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:54,986 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 11:51:54,986 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:54,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:54,987 INFO L82 PathProgramCache]: Analyzing trace with hash 193151625, now seen corresponding path program 1 times [2021-05-02 11:51:54,988 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:54,988 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1189483780] [2021-05-02 11:51:54,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:55,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:55,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:55,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:55,065 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 11:51:55,065 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:55,065 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1189483780] [2021-05-02 11:51:55,065 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1189483780] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:55,066 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1651273620] [2021-05-02 11:51:55,066 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 11:51:55,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:55,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 11:51:55,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:55,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:55,161 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:55,187 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 11:51:55,188 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1651273620] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:55,188 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:55,188 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 11:51:55,188 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979869398] [2021-05-02 11:51:55,189 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 11:51:55,192 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:55,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 11:51:55,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 11:51:55,196 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:55,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:55,289 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2021-05-02 11:51:55,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 11:51:55,290 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 11:51:55,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:55,291 INFO L225 Difference]: With dead ends: 28 [2021-05-02 11:51:55,291 INFO L226 Difference]: Without dead ends: 20 [2021-05-02 11:51:55,291 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 73.3ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 11:51:55,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-02 11:51:55,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2021-05-02 11:51:55,300 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 11:51:55,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-02 11:51:55,301 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2021-05-02 11:51:55,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:55,301 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-02 11:51:55,301 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:55,302 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-02 11:51:55,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 11:51:55,302 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:55,302 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:55,509 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 11:51:55,509 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:55,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:55,510 INFO L82 PathProgramCache]: Analyzing trace with hash 473295148, now seen corresponding path program 2 times [2021-05-02 11:51:55,510 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:55,510 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1874327215] [2021-05-02 11:51:55,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:55,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:55,559 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:55,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:55,584 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 11:51:55,584 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:55,584 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1874327215] [2021-05-02 11:51:55,585 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1874327215] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:51:55,585 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:51:55,585 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 11:51:55,585 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593194404] [2021-05-02 11:51:55,585 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 11:51:55,585 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:55,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 11:51:55,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 11:51:55,586 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 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 11:51:55,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:55,646 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2021-05-02 11:51:55,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 11:51:55,647 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 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 17 [2021-05-02 11:51:55,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:55,648 INFO L225 Difference]: With dead ends: 28 [2021-05-02 11:51:55,648 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 11:51:55,649 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 41.9ms TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-05-02 11:51:55,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 11:51:55,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2021-05-02 11:51:55,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 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 11:51:55,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2021-05-02 11:51:55,657 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 17 [2021-05-02 11:51:55,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:55,657 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2021-05-02 11:51:55,657 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 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 11:51:55,657 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2021-05-02 11:51:55,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 11:51:55,657 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:55,658 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:55,658 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 11:51:55,658 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:55,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:55,658 INFO L82 PathProgramCache]: Analyzing trace with hash -1412427221, now seen corresponding path program 1 times [2021-05-02 11:51:55,658 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:55,658 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1295611737] [2021-05-02 11:51:55,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:55,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:55,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:55,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:55,737 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:55,737 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:55,737 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1295611737] [2021-05-02 11:51:55,738 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1295611737] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:55,738 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1206104037] [2021-05-02 11:51:55,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:55,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:55,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 11:51:55,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:55,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:55,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:55,814 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:55,818 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:55,847 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:55,848 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1206104037] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:55,848 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:55,848 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 11:51:55,848 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91462027] [2021-05-02 11:51:55,848 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 11:51:55,848 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:55,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 11:51:55,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 11:51:55,849 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:55,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:55,923 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2021-05-02 11:51:55,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 11:51:55,927 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 2 states have call successors, (4), 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 20 [2021-05-02 11:51:55,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:55,927 INFO L225 Difference]: With dead ends: 34 [2021-05-02 11:51:55,927 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 11:51:55,928 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 61.4ms TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-05-02 11:51:55,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 11:51:55,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-05-02 11:51:55,930 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 11:51:55,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-05-02 11:51:55,931 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 20 [2021-05-02 11:51:55,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:55,931 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-05-02 11:51:55,931 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:55,931 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-05-02 11:51:55,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 11:51:55,932 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:55,932 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:56,156 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:56,156 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:56,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:56,157 INFO L82 PathProgramCache]: Analyzing trace with hash -402263410, now seen corresponding path program 2 times [2021-05-02 11:51:56,157 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:56,157 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [168720574] [2021-05-02 11:51:56,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:56,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:56,206 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:56,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:56,212 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:56,212 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:56,212 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [168720574] [2021-05-02 11:51:56,212 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [168720574] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:56,212 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1027660546] [2021-05-02 11:51:56,212 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:56,245 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 11:51:56,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:51:56,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 11:51:56,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:56,287 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:56,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:56,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:56,300 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:56,305 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:56,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:56,313 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:56,314 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:56,321 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:56,321 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1027660546] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:56,321 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:56,322 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 11:51:56,322 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093294499] [2021-05-02 11:51:56,322 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 11:51:56,322 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:56,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 11:51:56,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 11:51:56,323 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:56,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:56,496 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2021-05-02 11:51:56,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 11:51:56,496 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (4), 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 11:51:56,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:56,498 INFO L225 Difference]: With dead ends: 34 [2021-05-02 11:51:56,498 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 11:51:56,499 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 123.5ms TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-05-02 11:51:56,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 11:51:56,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2021-05-02 11:51:56,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 states have internal predecessors, (25), 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 11:51:56,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2021-05-02 11:51:56,511 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 23 [2021-05-02 11:51:56,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:56,512 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2021-05-02 11:51:56,512 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:56,512 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2021-05-02 11:51:56,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 11:51:56,513 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:56,513 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:56,728 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:56,729 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:56,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:56,729 INFO L82 PathProgramCache]: Analyzing trace with hash -1841039991, now seen corresponding path program 3 times [2021-05-02 11:51:56,730 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:56,730 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1478599512] [2021-05-02 11:51:56,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:56,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:56,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:56,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:56,795 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:56,795 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:56,795 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1478599512] [2021-05-02 11:51:56,795 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1478599512] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:56,795 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [722814971] [2021-05-02 11:51:56,795 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 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:56,839 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 11:51:56,839 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:51:56,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 11:51:56,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:56,862 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:56,871 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:56,885 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:56,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:56,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:56,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:56,907 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 21 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 11:51:56,908 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [722814971] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:56,908 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:56,908 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 9 [2021-05-02 11:51:56,908 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [610920808] [2021-05-02 11:51:56,908 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 11:51:56,908 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:56,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 11:51:56,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 11:51:56,909 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:57,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:57,084 INFO L93 Difference]: Finished difference Result 37 states and 41 transitions. [2021-05-02 11:51:57,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 11:51:57,085 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-02 11:51:57,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:57,085 INFO L225 Difference]: With dead ends: 37 [2021-05-02 11:51:57,085 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 11:51:57,086 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 158.0ms TimeCoverageRelationStatistics Valid=84, Invalid=126, Unknown=0, NotChecked=0, Total=210 [2021-05-02 11:51:57,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 11:51:57,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2021-05-02 11:51:57,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.16) internal successors, (29), 25 states have internal predecessors, (29), 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 11:51:57,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2021-05-02 11:51:57,089 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 26 [2021-05-02 11:51:57,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:57,089 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2021-05-02 11:51:57,089 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:57,089 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2021-05-02 11:51:57,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 11:51:57,090 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:57,090 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:57,306 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:57,307 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:57,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:57,307 INFO L82 PathProgramCache]: Analyzing trace with hash -660550482, now seen corresponding path program 4 times [2021-05-02 11:51:57,308 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:57,308 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2084531349] [2021-05-02 11:51:57,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:57,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:57,374 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:57,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:57,384 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:57,384 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:57,384 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2084531349] [2021-05-02 11:51:57,385 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2084531349] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:57,385 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1803762675] [2021-05-02 11:51:57,385 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 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 11:51:57,418 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 11:51:57,419 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:51:57,419 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 11:51:57,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:57,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:57,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:57,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:57,464 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:57,471 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:57,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:57,480 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:57,482 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:57,490 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:57,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:57,498 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:57,501 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:57,512 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:57,512 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1803762675] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:57,512 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:57,513 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 11:51:57,513 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012669339] [2021-05-02 11:51:57,514 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 11:51:57,514 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:57,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 11:51:57,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-02 11:51:57,515 INFO L87 Difference]: Start difference. First operand 30 states and 33 transitions. Second operand has 11 states, 11 states have (on average 2.727272727272727) internal successors, (30), 10 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:57,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:57,703 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2021-05-02 11:51:57,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 11:51:57,704 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.727272727272727) internal successors, (30), 10 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 11:51:57,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:57,704 INFO L225 Difference]: With dead ends: 40 [2021-05-02 11:51:57,704 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 11:51:57,705 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 164.7ms TimeCoverageRelationStatistics Valid=118, Invalid=188, Unknown=0, NotChecked=0, Total=306 [2021-05-02 11:51:57,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 11:51:57,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2021-05-02 11:51:57,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 28 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:57,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2021-05-02 11:51:57,708 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 29 [2021-05-02 11:51:57,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:57,708 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2021-05-02 11:51:57,708 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.727272727272727) internal successors, (30), 10 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:57,708 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2021-05-02 11:51:57,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 11:51:57,709 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:57,709 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:57,925 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:57,925 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:57,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:57,926 INFO L82 PathProgramCache]: Analyzing trace with hash 110192489, now seen corresponding path program 5 times [2021-05-02 11:51:57,926 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:57,926 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1858970951] [2021-05-02 11:51:57,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:57,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:57,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:57,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:58,006 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:58,006 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:58,006 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1858970951] [2021-05-02 11:51:58,007 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1858970951] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:58,007 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1915328598] [2021-05-02 11:51:58,007 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 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 11:51:58,046 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-05-02 11:51:58,046 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:51:58,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 11:51:58,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:58,076 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:58,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:58,084 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:58,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:58,090 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:58,091 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:58,095 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:58,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:58,101 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:58,103 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:58,116 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 37 proven. 26 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 11:51:58,117 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1915328598] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:58,117 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:58,117 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 11 [2021-05-02 11:51:58,117 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590906951] [2021-05-02 11:51:58,117 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 11:51:58,117 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:58,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 11:51:58,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-02 11:51:58,118 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:58,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:58,319 INFO L93 Difference]: Finished difference Result 41 states and 46 transitions. [2021-05-02 11:51:58,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 11:51:58,320 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 11:51:58,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:58,320 INFO L225 Difference]: With dead ends: 41 [2021-05-02 11:51:58,320 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 11:51:58,321 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 184.2ms TimeCoverageRelationStatistics Valid=135, Invalid=207, Unknown=0, NotChecked=0, Total=342 [2021-05-02 11:51:58,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 11:51:58,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-02 11:51:58,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.1935483870967742) internal successors, (37), 31 states have internal predecessors, (37), 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 11:51:58,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2021-05-02 11:51:58,332 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 32 [2021-05-02 11:51:58,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:58,332 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2021-05-02 11:51:58,333 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:58,333 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2021-05-02 11:51:58,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 11:51:58,336 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:58,337 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:58,558 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:58,558 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:58,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:58,559 INFO L82 PathProgramCache]: Analyzing trace with hash 418877134, now seen corresponding path program 6 times [2021-05-02 11:51:58,559 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:58,559 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [588850710] [2021-05-02 11:51:58,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:58,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 11:51:58,573 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 11:51:58,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 11:51:58,579 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 11:51:58,592 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-05-02 11:51:58,593 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-02 11:51:58,593 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-02 11:51:58,616 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 11:51:58 BoogieIcfgContainer [2021-05-02 11:51:58,616 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 11:51:58,617 INFO L168 Benchmark]: Toolchain (without parser) took 4416.84 ms. Allocated memory was 238.0 MB in the beginning and 286.3 MB in the end (delta: 48.2 MB). Free memory was 202.9 MB in the beginning and 247.9 MB in the end (delta: -45.0 MB). Peak memory consumption was 4.0 MB. Max. memory is 8.0 GB. [2021-05-02 11:51:58,617 INFO L168 Benchmark]: CDTParser took 0.09 ms. Allocated memory is still 238.0 MB. Free memory is still 219.4 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 11:51:58,617 INFO L168 Benchmark]: CACSL2BoogieTranslator took 128.10 ms. Allocated memory is still 238.0 MB. Free memory was 202.8 MB in the beginning and 221.7 MB in the end (delta: -18.9 MB). Peak memory consumption was 11.8 MB. Max. memory is 8.0 GB. [2021-05-02 11:51:58,617 INFO L168 Benchmark]: Boogie Preprocessor took 38.74 ms. Allocated memory is still 238.0 MB. Free memory was 221.7 MB in the beginning and 219.9 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-02 11:51:58,617 INFO L168 Benchmark]: RCFGBuilder took 219.26 ms. Allocated memory is still 238.0 MB. Free memory was 219.9 MB in the beginning and 205.9 MB in the end (delta: 14.0 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. [2021-05-02 11:51:58,617 INFO L168 Benchmark]: TraceAbstraction took 4026.36 ms. Allocated memory was 238.0 MB in the beginning and 286.3 MB in the end (delta: 48.2 MB). Free memory was 205.4 MB in the beginning and 247.9 MB in the end (delta: -42.5 MB). Peak memory consumption was 6.8 MB. Max. memory is 8.0 GB. [2021-05-02 11:51:58,617 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.09 ms. Allocated memory is still 238.0 MB. Free memory is still 219.4 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 128.10 ms. Allocated memory is still 238.0 MB. Free memory was 202.8 MB in the beginning and 221.7 MB in the end (delta: -18.9 MB). Peak memory consumption was 11.8 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 38.74 ms. Allocated memory is still 238.0 MB. Free memory was 221.7 MB in the beginning and 219.9 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 219.26 ms. Allocated memory is still 238.0 MB. Free memory was 219.9 MB in the beginning and 205.9 MB in the end (delta: 14.0 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 4026.36 ms. Allocated memory was 238.0 MB in the beginning and 286.3 MB in the end (delta: 48.2 MB). Free memory was 205.4 MB in the beginning and 247.9 MB in the end (delta: -42.5 MB). Peak memory consumption was 6.8 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 16]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L23] int i, sn=0; [L24] i=1 VAL [i=1, sn=0] [L24] COND TRUE i<=8 VAL [i=1, sn=0] [L25] COND TRUE i<4 [L26] sn = sn + (2) VAL [i=1, sn=2] [L24] i++ VAL [i=2, sn=2] [L24] COND TRUE i<=8 VAL [i=2, sn=2] [L25] COND TRUE i<4 [L26] sn = sn + (2) VAL [i=2, sn=4] [L24] i++ VAL [i=3, sn=4] [L24] COND TRUE i<=8 VAL [i=3, sn=4] [L25] COND TRUE i<4 [L26] sn = sn + (2) VAL [i=3, sn=6] [L24] i++ VAL [i=4, sn=6] [L24] COND TRUE i<=8 VAL [i=4, sn=6] [L25] COND FALSE !(i<4) VAL [i=4, sn=6] [L24] i++ VAL [i=5, sn=6] [L24] COND TRUE i<=8 VAL [i=5, sn=6] [L25] COND FALSE !(i<4) VAL [i=5, sn=6] [L24] i++ VAL [i=6, sn=6] [L24] COND TRUE i<=8 VAL [i=6, sn=6] [L25] COND FALSE !(i<4) VAL [i=6, sn=6] [L24] i++ VAL [i=7, sn=6] [L24] COND TRUE i<=8 VAL [i=7, sn=6] [L25] COND FALSE !(i<4) VAL [i=7, sn=6] [L24] i++ VAL [i=8, sn=6] [L24] COND TRUE i<=8 VAL [i=8, sn=6] [L25] COND FALSE !(i<4) VAL [i=8, sn=6] [L24] i++ VAL [i=9, sn=6] [L24] COND FALSE !(i<=8) VAL [i=9, sn=6] [L28] CALL __VERIFIER_assert(sn==8*(2) || sn == 0) VAL [\old(cond)=0] [L15] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L16] reach_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 23 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3966.0ms, OverallIterations: 10, TraceHistogramMax: 8, EmptinessCheckTime: 12.1ms, AutomataDifference: 1083.0ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 7.1ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 102 SDtfs, 240 SDslu, 129 SDs, 0 SdLazy, 279 SolverSat, 82 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 301.1ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 251 GetRequests, 168 SyntacticMatches, 2 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 861.8ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=36occurred in iteration=9, InterpolantAutomatonStates: 61, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 68.5ms AutomataMinimizationTime, 9 MinimizatonAttempts, 10 StatesRemovedByMinimization, 6 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 54.2ms SsaConstructionTime, 172.9ms SatisfiabilityAnalysisTime, 965.2ms InterpolantComputationTime, 362 NumberOfCodeBlocks, 357 NumberOfCodeBlocksAsserted, 28 NumberOfCheckSat, 312 ConstructedInterpolants, 0 QuantifiedInterpolants, 830 SizeOfPredicates, 0 NumberOfNonLiveVariables, 539 ConjunctsInSsa, 33 ConjunctsInUnsatCore, 15 InterpolantComputations, 3 PerfectInterpolantSequences, 87/387 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...