/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/in-de32.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 12:53:11,533 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 12:53:11,535 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 12:53:11,572 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 12:53:11,572 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 12:53:11,575 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 12:53:11,578 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 12:53:11,582 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 12:53:11,584 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 12:53:11,588 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 12:53:11,589 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 12:53:11,590 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 12:53:11,590 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 12:53:11,592 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 12:53:11,594 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 12:53:11,595 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 12:53:11,596 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 12:53:11,597 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 12:53:11,598 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 12:53:11,607 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 12:53:11,608 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 12:53:11,610 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 12:53:11,611 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 12:53:11,613 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 12:53:11,618 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-02 12:53:11,619 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-02 12:53:11,619 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-02 12:53:11,620 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-02 12:53:11,620 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-02 12:53:11,621 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-02 12:53:11,621 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-02 12:53:11,621 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-02 12:53:11,622 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-02 12:53:11,623 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-02 12:53:11,623 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-02 12:53:11,624 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-02 12:53:11,624 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-02 12:53:11,624 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-02 12:53:11,625 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 12:53:11,625 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 12:53:11,626 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 12:53:11,632 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 12:53:11,680 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 12:53:11,680 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 12:53:11,683 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 12:53:11,683 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 12:53:11,683 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 12:53:11,683 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 12:53:11,683 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 12:53:11,684 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 12:53:11,684 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 12:53:11,684 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 12:53:11,685 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 12:53:11,685 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 12:53:11,685 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 12:53:11,685 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 12:53:11,685 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 12:53:11,685 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 12:53:11,686 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 12:53:11,686 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 12:53:11,686 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 12:53:11,686 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 12:53:11,686 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 12:53:11,686 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 12:53:11,687 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 12:53:11,687 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 12:53:11,687 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 12:53:11,687 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 12:53:11,687 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 12:53:11,687 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 12:53:11,687 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 12:53:11,992 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 12:53:12,024 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 12:53:12,026 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 12:53:12,027 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 12:53:12,030 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 12:53:12,031 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/in-de32.c [2021-05-02 12:53:12,107 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/98700ffb0/d551be5d048147d297fcd93dd42add81/FLAGc8f9a1f86 [2021-05-02 12:53:12,481 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 12:53:12,482 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de32.c [2021-05-02 12:53:12,487 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/98700ffb0/d551be5d048147d297fcd93dd42add81/FLAGc8f9a1f86 [2021-05-02 12:53:12,503 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/98700ffb0/d551be5d048147d297fcd93dd42add81 [2021-05-02 12:53:12,509 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 12:53:12,511 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 12:53:12,515 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 12:53:12,515 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 12:53:12,518 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 12:53:12,518 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:53:12" (1/1) ... [2021-05-02 12:53:12,520 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@44a53301 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:53:12, skipping insertion in model container [2021-05-02 12:53:12,520 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:53:12" (1/1) ... [2021-05-02 12:53:12,526 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 12:53:12,539 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 12:53:12,673 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de32.c[368,381] [2021-05-02 12:53:12,693 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:53:12,700 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 12:53:12,740 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de32.c[368,381] [2021-05-02 12:53:12,743 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:53:12,758 INFO L208 MainTranslator]: Completed translation [2021-05-02 12:53:12,759 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:53:12 WrapperNode [2021-05-02 12:53:12,759 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 12:53:12,760 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 12:53:12,760 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 12:53:12,761 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 12:53:12,768 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:53:12" (1/1) ... [2021-05-02 12:53:12,768 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:53:12" (1/1) ... [2021-05-02 12:53:12,773 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:53:12" (1/1) ... [2021-05-02 12:53:12,773 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:53:12" (1/1) ... [2021-05-02 12:53:12,777 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:53:12" (1/1) ... [2021-05-02 12:53:12,780 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:53:12" (1/1) ... [2021-05-02 12:53:12,781 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:53:12" (1/1) ... [2021-05-02 12:53:12,782 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 12:53:12,783 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 12:53:12,783 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 12:53:12,783 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 12:53:12,784 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:53:12" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 12:53:12,836 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 12:53:12,836 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 12:53:12,836 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 12:53:12,836 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 12:53:12,837 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 12:53:12,837 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 12:53:12,837 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 12:53:12,837 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 12:53:12,838 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 12:53:12,838 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-05-02 12:53:12,839 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 12:53:12,839 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 12:53:12,840 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 12:53:12,840 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 12:53:12,840 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 12:53:12,840 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 12:53:12,841 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 12:53:12,841 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 12:53:13,021 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 12:53:13,021 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-05-02 12:53:13,022 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:53:13 BoogieIcfgContainer [2021-05-02 12:53:13,023 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 12:53:13,024 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 12:53:13,024 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 12:53:13,026 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 12:53:13,026 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 12:53:12" (1/3) ... [2021-05-02 12:53:13,027 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6269a32 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:53:13, skipping insertion in model container [2021-05-02 12:53:13,027 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:53:12" (2/3) ... [2021-05-02 12:53:13,027 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6269a32 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:53:13, skipping insertion in model container [2021-05-02 12:53:13,027 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:53:13" (3/3) ... [2021-05-02 12:53:13,028 INFO L111 eAbstractionObserver]: Analyzing ICFG in-de32.c [2021-05-02 12:53:13,033 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 12:53:13,036 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 12:53:13,050 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 12:53:13,068 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 12:53:13,068 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 12:53:13,068 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 12:53:13,068 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 12:53:13,068 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 12:53:13,068 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 12:53:13,069 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 12:53:13,069 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 12:53:13,103 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 15 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 12:53:13,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 12:53:13,106 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:13,107 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:13,107 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:13,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:13,111 INFO L82 PathProgramCache]: Analyzing trace with hash 1792812365, now seen corresponding path program 1 times [2021-05-02 12:53:13,134 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:13,135 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2030460415] [2021-05-02 12:53:13,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:13,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:13,453 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:13,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:13,479 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:53:13,480 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:13,480 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2030460415] [2021-05-02 12:53:13,482 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2030460415] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:53:13,482 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:53:13,483 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 12:53:13,483 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42847780] [2021-05-02 12:53:13,487 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 12:53:13,488 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:13,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 12:53:13,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 12:53:13,504 INFO L87 Difference]: Start difference. First operand has 22 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 15 states have internal predecessors, (22), 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 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:13,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:13,735 INFO L93 Difference]: Finished difference Result 47 states and 64 transitions. [2021-05-02 12:53:13,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 12:53:13,737 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 4 states have internal predecessors, (10), 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 14 [2021-05-02 12:53:13,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:13,742 INFO L225 Difference]: With dead ends: 47 [2021-05-02 12:53:13,742 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 12:53:13,744 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 183.1ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:53:13,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 12:53:13,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 12:53:13,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:13,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2021-05-02 12:53:13,777 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 14 [2021-05-02 12:53:13,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:13,778 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2021-05-02 12:53:13,778 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:13,778 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2021-05-02 12:53:13,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 12:53:13,780 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:13,780 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:13,780 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 12:53:13,781 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:13,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:13,781 INFO L82 PathProgramCache]: Analyzing trace with hash -222896448, now seen corresponding path program 1 times [2021-05-02 12:53:13,781 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:13,782 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2130569199] [2021-05-02 12:53:13,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:13,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:13,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:13,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:13,856 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:53:13,857 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:13,857 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2130569199] [2021-05-02 12:53:13,857 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2130569199] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:53:13,857 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:53:13,857 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 12:53:13,857 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565083499] [2021-05-02 12:53:13,859 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 12:53:13,859 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:13,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 12:53:13,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 12:53:13,860 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:13,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:13,933 INFO L93 Difference]: Finished difference Result 30 states and 37 transitions. [2021-05-02 12:53:13,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 12:53:13,934 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 12:53:13,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:13,937 INFO L225 Difference]: With dead ends: 30 [2021-05-02 12:53:13,937 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 12:53:13,939 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 44.6ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 12:53:13,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 12:53:13,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-05-02 12:53:13,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 17 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:13,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2021-05-02 12:53:13,956 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 15 [2021-05-02 12:53:13,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:13,957 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2021-05-02 12:53:13,957 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:13,957 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2021-05-02 12:53:13,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 12:53:13,958 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:13,958 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:13,958 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 12:53:13,959 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:13,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:13,960 INFO L82 PathProgramCache]: Analyzing trace with hash 1179931951, now seen corresponding path program 1 times [2021-05-02 12:53:13,960 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:13,961 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [419662096] [2021-05-02 12:53:13,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:13,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:14,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:14,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:14,051 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:53:14,052 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:14,052 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [419662096] [2021-05-02 12:53:14,052 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [419662096] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:53:14,052 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:53:14,052 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 12:53:14,053 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88513659] [2021-05-02 12:53:14,053 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 12:53:14,053 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:14,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 12:53:14,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 12:53:14,054 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:14,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:14,130 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2021-05-02 12:53:14,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 12:53:14,131 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 12:53:14,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:14,131 INFO L225 Difference]: With dead ends: 27 [2021-05-02 12:53:14,131 INFO L226 Difference]: Without dead ends: 18 [2021-05-02 12:53:14,132 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 62.8ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 12:53:14,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-05-02 12:53:14,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-05-02 12:53:14,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:14,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2021-05-02 12:53:14,136 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 15 [2021-05-02 12:53:14,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:14,136 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2021-05-02 12:53:14,136 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:14,136 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2021-05-02 12:53:14,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-02 12:53:14,137 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:14,137 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:14,137 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 12:53:14,137 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:14,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:14,138 INFO L82 PathProgramCache]: Analyzing trace with hash 1314021247, now seen corresponding path program 1 times [2021-05-02 12:53:14,138 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:14,138 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [204825842] [2021-05-02 12:53:14,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:14,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:14,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:14,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:14,235 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:53:14,235 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:14,235 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [204825842] [2021-05-02 12:53:14,235 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [204825842] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:14,235 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1397575530] [2021-05-02 12:53:14,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:14,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:14,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 12:53:14,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:14,389 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:53:14,390 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1397575530] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:14,391 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:14,394 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 12:53:14,394 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065059075] [2021-05-02 12:53:14,395 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 12:53:14,395 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:14,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 12:53:14,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 12:53:14,396 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 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 12:53:14,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:14,559 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2021-05-02 12:53:14,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 12:53:14,560 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 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 16 [2021-05-02 12:53:14,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:14,561 INFO L225 Difference]: With dead ends: 32 [2021-05-02 12:53:14,561 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 12:53:14,562 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 141.9ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:53:14,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 12:53:14,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2021-05-02 12:53:14,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 19 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 12:53:14,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2021-05-02 12:53:14,571 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 16 [2021-05-02 12:53:14,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:14,571 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2021-05-02 12:53:14,571 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 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 12:53:14,572 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2021-05-02 12:53:14,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 12:53:14,572 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:14,572 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:14,794 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:14,794 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:14,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:14,795 INFO L82 PathProgramCache]: Analyzing trace with hash -1642511809, now seen corresponding path program 1 times [2021-05-02 12:53:14,795 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:14,795 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1117291181] [2021-05-02 12:53:14,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:14,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:14,911 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:14,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:14,917 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:53:14,917 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:14,917 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1117291181] [2021-05-02 12:53:14,917 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1117291181] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:14,918 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1367168327] [2021-05-02 12:53:14,918 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 12:53:14,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:14,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 12:53:14,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:15,034 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:15,038 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:15,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:15,084 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:53:15,084 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1367168327] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:15,084 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:15,084 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2021-05-02 12:53:15,085 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404234017] [2021-05-02 12:53:15,085 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 12:53:15,085 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:15,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 12:53:15,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 12:53:15,086 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:15,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:15,303 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2021-05-02 12:53:15,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 12:53:15,303 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 12:53:15,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:15,305 INFO L225 Difference]: With dead ends: 36 [2021-05-02 12:53:15,305 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 12:53:15,309 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 187.6ms TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:53:15,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 12:53:15,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2021-05-02 12:53:15,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 22 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:15,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2021-05-02 12:53:15,323 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 17 [2021-05-02 12:53:15,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:15,323 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2021-05-02 12:53:15,324 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:15,324 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2021-05-02 12:53:15,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 12:53:15,331 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:15,331 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:15,531 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:15,532 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:15,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:15,532 INFO L82 PathProgramCache]: Analyzing trace with hash 1713829536, now seen corresponding path program 2 times [2021-05-02 12:53:15,532 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:15,532 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1734149824] [2021-05-02 12:53:15,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:15,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:15,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:15,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:15,637 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:53:15,637 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:15,637 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1734149824] [2021-05-02 12:53:15,637 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1734149824] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:15,638 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1289317621] [2021-05-02 12:53:15,638 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 12:53:15,682 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:53:15,682 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:15,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 12:53:15,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:15,748 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:53:15,749 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1289317621] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:15,749 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:15,749 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 12:53:15,749 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206769414] [2021-05-02 12:53:15,749 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 12:53:15,750 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:15,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 12:53:15,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:53:15,750 INFO L87 Difference]: Start difference. First operand 27 states and 34 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:15,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:15,938 INFO L93 Difference]: Finished difference Result 45 states and 60 transitions. [2021-05-02 12:53:15,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 12:53:15,938 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 12:53:15,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:15,940 INFO L225 Difference]: With dead ends: 45 [2021-05-02 12:53:15,941 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 12:53:15,941 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 174.9ms TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:53:15,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 12:53:15,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 32. [2021-05-02 12:53:15,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.3703703703703705) internal successors, (37), 27 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 12:53:15,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 41 transitions. [2021-05-02 12:53:15,959 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 41 transitions. Word has length 17 [2021-05-02 12:53:15,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:15,959 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 41 transitions. [2021-05-02 12:53:15,959 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:15,959 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 41 transitions. [2021-05-02 12:53:15,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 12:53:15,960 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:15,960 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:16,176 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:16,177 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:16,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:16,177 INFO L82 PathProgramCache]: Analyzing trace with hash 1194243967, now seen corresponding path program 2 times [2021-05-02 12:53:16,178 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:16,178 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472405701] [2021-05-02 12:53:16,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:16,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:16,276 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:16,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:16,281 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:53:16,281 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:16,281 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [472405701] [2021-05-02 12:53:16,281 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [472405701] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:16,281 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1693771994] [2021-05-02 12:53:16,281 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 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:16,328 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:53:16,328 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:16,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 12:53:16,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:16,394 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:53:16,394 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1693771994] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:16,394 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:16,394 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2021-05-02 12:53:16,394 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384623252] [2021-05-02 12:53:16,395 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 12:53:16,395 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:16,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 12:53:16,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-02 12:53:16,395 INFO L87 Difference]: Start difference. First operand 32 states and 41 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:16,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:16,537 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2021-05-02 12:53:16,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 12:53:16,537 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-05-02 12:53:16,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:16,538 INFO L225 Difference]: With dead ends: 39 [2021-05-02 12:53:16,538 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 12:53:16,538 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 184.6ms TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:53:16,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 12:53:16,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-05-02 12:53:16,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 23 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:16,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2021-05-02 12:53:16,543 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 18 [2021-05-02 12:53:16,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:16,543 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2021-05-02 12:53:16,543 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:16,543 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2021-05-02 12:53:16,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 12:53:16,543 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:16,543 INFO L523 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:16,756 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:16,757 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:16,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:16,757 INFO L82 PathProgramCache]: Analyzing trace with hash 1222984607, now seen corresponding path program 3 times [2021-05-02 12:53:16,757 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:16,757 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1562489838] [2021-05-02 12:53:16,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:16,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:16,843 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:16,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:16,850 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:53:16,850 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:16,851 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1562489838] [2021-05-02 12:53:16,851 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1562489838] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:16,851 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1101038746] [2021-05-02 12:53:16,851 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 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:16,899 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 12:53:16,899 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:16,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 12:53:16,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:16,941 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 12:53:16,941 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1101038746] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:53:16,941 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 12:53:16,941 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [8] total 10 [2021-05-02 12:53:16,942 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341758165] [2021-05-02 12:53:16,942 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 12:53:16,942 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:16,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 12:53:16,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:53:16,943 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:16,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:16,964 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2021-05-02 12:53:16,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 12:53:16,964 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-05-02 12:53:16,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:16,965 INFO L225 Difference]: With dead ends: 35 [2021-05-02 12:53:16,965 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 12:53:16,965 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 78.6ms TimeCoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:53:16,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 12:53:16,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-05-02 12:53:16,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 23 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:16,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2021-05-02 12:53:16,978 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 18 [2021-05-02 12:53:16,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:16,978 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2021-05-02 12:53:16,978 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:16,978 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2021-05-02 12:53:16,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 12:53:16,979 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:16,979 INFO L523 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:17,196 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:17,196 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:17,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:17,197 INFO L82 PathProgramCache]: Analyzing trace with hash -1669154290, now seen corresponding path program 1 times [2021-05-02 12:53:17,197 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:17,197 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1484494032] [2021-05-02 12:53:17,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:17,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:17,286 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:17,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:17,298 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:53:17,298 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:17,298 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1484494032] [2021-05-02 12:53:17,298 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1484494032] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:17,298 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [530021468] [2021-05-02 12:53:17,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:17,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:17,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 12:53:17,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:17,406 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:17,421 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:53:17,422 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [530021468] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:17,422 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:17,422 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 12:53:17,422 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436014324] [2021-05-02 12:53:17,422 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 12:53:17,422 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:17,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 12:53:17,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:53:17,423 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand has 10 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:17,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:17,680 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2021-05-02 12:53:17,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 12:53:17,680 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (4), 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 18 [2021-05-02 12:53:17,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:17,682 INFO L225 Difference]: With dead ends: 46 [2021-05-02 12:53:17,683 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 12:53:17,683 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 248.3ms TimeCoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-05-02 12:53:17,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 12:53:17,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 34. [2021-05-02 12:53:17,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 29 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:17,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2021-05-02 12:53:17,696 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 18 [2021-05-02 12:53:17,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:17,697 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2021-05-02 12:53:17,697 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:17,697 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2021-05-02 12:53:17,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 12:53:17,698 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:17,698 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:17,919 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:17,920 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:17,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:17,920 INFO L82 PathProgramCache]: Analyzing trace with hash -1675054353, now seen corresponding path program 3 times [2021-05-02 12:53:17,920 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:17,920 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [361724957] [2021-05-02 12:53:17,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:17,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:18,009 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:18,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:18,016 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:53:18,016 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:18,016 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [361724957] [2021-05-02 12:53:18,016 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [361724957] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:18,016 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [956133781] [2021-05-02 12:53:18,017 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:18,066 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 12:53:18,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:18,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 12:53:18,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:18,134 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:53:18,134 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [956133781] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:18,134 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:18,135 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 10 [2021-05-02 12:53:18,136 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2138491634] [2021-05-02 12:53:18,137 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 12:53:18,138 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:18,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 12:53:18,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:53:18,140 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:18,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:18,354 INFO L93 Difference]: Finished difference Result 47 states and 55 transitions. [2021-05-02 12:53:18,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 12:53:18,361 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-02 12:53:18,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:18,364 INFO L225 Difference]: With dead ends: 47 [2021-05-02 12:53:18,364 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 12:53:18,364 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 225.0ms TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2021-05-02 12:53:18,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 12:53:18,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 35. [2021-05-02 12:53:18,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.3) internal successors, (39), 30 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:18,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2021-05-02 12:53:18,377 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 19 [2021-05-02 12:53:18,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:18,377 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2021-05-02 12:53:18,377 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:18,377 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2021-05-02 12:53:18,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 12:53:18,378 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:18,378 INFO L523 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:18,578 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:18,579 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:18,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:18,579 INFO L82 PathProgramCache]: Analyzing trace with hash 294522095, now seen corresponding path program 2 times [2021-05-02 12:53:18,579 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:18,579 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126948972] [2021-05-02 12:53:18,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:18,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:18,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:18,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:18,707 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:53:18,707 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:18,707 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [126948972] [2021-05-02 12:53:18,707 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [126948972] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:18,707 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1196708932] [2021-05-02 12:53:18,707 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:18,764 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:53:18,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:18,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 12:53:18,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:18,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:18,831 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:53:18,832 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1196708932] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:18,832 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:18,832 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 12:53:18,833 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794292889] [2021-05-02 12:53:18,833 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 12:53:18,833 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:18,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 12:53:18,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:53:18,834 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:19,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:19,206 INFO L93 Difference]: Finished difference Result 54 states and 71 transitions. [2021-05-02 12:53:19,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 12:53:19,206 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-02 12:53:19,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:19,207 INFO L225 Difference]: With dead ends: 54 [2021-05-02 12:53:19,207 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 12:53:19,207 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 313.1ms TimeCoverageRelationStatistics Valid=62, Invalid=280, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:53:19,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 12:53:19,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 41. [2021-05-02 12:53:19,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.3055555555555556) internal successors, (47), 36 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:19,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 51 transitions. [2021-05-02 12:53:19,213 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 51 transitions. Word has length 19 [2021-05-02 12:53:19,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:19,213 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 51 transitions. [2021-05-02 12:53:19,213 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:19,214 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 51 transitions. [2021-05-02 12:53:19,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 12:53:19,214 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:19,214 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:19,428 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 12:53:19,429 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:19,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:19,429 INFO L82 PathProgramCache]: Analyzing trace with hash -854221811, now seen corresponding path program 4 times [2021-05-02 12:53:19,429 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:19,430 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [328488719] [2021-05-02 12:53:19,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:19,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:19,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:19,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:19,538 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:53:19,538 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:19,539 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [328488719] [2021-05-02 12:53:19,539 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [328488719] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:19,539 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1606283006] [2021-05-02 12:53:19,539 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:19,597 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:53:19,597 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:19,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 12:53:19,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:19,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:19,637 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:19,640 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:19,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:19,668 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:53:19,668 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1606283006] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:19,668 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:19,668 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 10 [2021-05-02 12:53:19,668 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870583575] [2021-05-02 12:53:19,669 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 12:53:19,669 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:19,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 12:53:19,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:53:19,669 INFO L87 Difference]: Start difference. First operand 41 states and 51 transitions. Second operand has 10 states, 10 states have (on average 1.8) internal successors, (18), 7 states have internal predecessors, (18), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:19,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:19,895 INFO L93 Difference]: Finished difference Result 64 states and 80 transitions. [2021-05-02 12:53:19,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 12:53:19,895 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 7 states have internal predecessors, (18), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-02 12:53:19,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:19,896 INFO L225 Difference]: With dead ends: 64 [2021-05-02 12:53:19,896 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 12:53:19,896 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 207.9ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-02 12:53:19,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 12:53:19,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 44. [2021-05-02 12:53:19,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.3333333333333333) internal successors, (52), 39 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:19,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 56 transitions. [2021-05-02 12:53:19,912 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 56 transitions. Word has length 20 [2021-05-02 12:53:19,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:19,912 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 56 transitions. [2021-05-02 12:53:19,912 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 7 states have internal predecessors, (18), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:19,912 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 56 transitions. [2021-05-02 12:53:19,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 12:53:19,913 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:19,913 INFO L523 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:20,128 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:20,129 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:20,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:20,129 INFO L82 PathProgramCache]: Analyzing trace with hash 1038947886, now seen corresponding path program 3 times [2021-05-02 12:53:20,129 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:20,130 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1509983145] [2021-05-02 12:53:20,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:20,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:20,262 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:20,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:20,267 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:53:20,267 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:20,267 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1509983145] [2021-05-02 12:53:20,267 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1509983145] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:20,267 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1752273384] [2021-05-02 12:53:20,267 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 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:20,301 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 12:53:20,301 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:20,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 12:53:20,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:20,351 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:53:20,351 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1752273384] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:20,351 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:20,351 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 4] total 13 [2021-05-02 12:53:20,351 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1651054336] [2021-05-02 12:53:20,352 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 12:53:20,352 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:20,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 12:53:20,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:53:20,354 INFO L87 Difference]: Start difference. First operand 44 states and 56 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 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 12:53:20,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:20,978 INFO L93 Difference]: Finished difference Result 73 states and 101 transitions. [2021-05-02 12:53:20,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 12:53:20,978 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 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 20 [2021-05-02 12:53:20,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:20,979 INFO L225 Difference]: With dead ends: 73 [2021-05-02 12:53:20,979 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 12:53:20,979 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 536.4ms TimeCoverageRelationStatistics Valid=130, Invalid=572, Unknown=0, NotChecked=0, Total=702 [2021-05-02 12:53:20,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 12:53:20,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 51. [2021-05-02 12:53:20,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.3043478260869565) internal successors, (60), 46 states have internal predecessors, (60), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:20,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 64 transitions. [2021-05-02 12:53:20,986 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 64 transitions. Word has length 20 [2021-05-02 12:53:20,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:20,987 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 64 transitions. [2021-05-02 12:53:20,987 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 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 12:53:20,987 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 64 transitions. [2021-05-02 12:53:20,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 12:53:20,987 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:20,987 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:21,209 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 12:53:21,209 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:21,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:21,210 INFO L82 PathProgramCache]: Analyzing trace with hash -1178216785, now seen corresponding path program 5 times [2021-05-02 12:53:21,210 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:21,210 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [830543364] [2021-05-02 12:53:21,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:21,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:21,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:21,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:21,305 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:53:21,305 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:21,305 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [830543364] [2021-05-02 12:53:21,305 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [830543364] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:21,305 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1348432285] [2021-05-02 12:53:21,306 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:21,375 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-02 12:53:21,375 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:21,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 12:53:21,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:21,484 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:53:21,485 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1348432285] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:21,485 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:21,485 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 12 [2021-05-02 12:53:21,485 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1751508020] [2021-05-02 12:53:21,485 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 12:53:21,485 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:21,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 12:53:21,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:53:21,486 INFO L87 Difference]: Start difference. First operand 51 states and 64 transitions. Second operand has 12 states, 12 states have (on average 1.75) internal successors, (21), 11 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 12:53:21,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:21,744 INFO L93 Difference]: Finished difference Result 59 states and 71 transitions. [2021-05-02 12:53:21,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 12:53:21,745 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.75) internal successors, (21), 11 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 21 [2021-05-02 12:53:21,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:21,745 INFO L225 Difference]: With dead ends: 59 [2021-05-02 12:53:21,745 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 12:53:21,746 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 266.8ms TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:53:21,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 12:53:21,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2021-05-02 12:53:21,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.2926829268292683) internal successors, (53), 41 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:21,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 57 transitions. [2021-05-02 12:53:21,751 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 57 transitions. Word has length 21 [2021-05-02 12:53:21,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:21,752 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 57 transitions. [2021-05-02 12:53:21,752 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.75) internal successors, (21), 11 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 12:53:21,752 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 57 transitions. [2021-05-02 12:53:21,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 12:53:21,752 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:21,752 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:21,968 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 12:53:21,969 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:21,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:21,969 INFO L82 PathProgramCache]: Analyzing trace with hash 1752036735, now seen corresponding path program 6 times [2021-05-02 12:53:21,969 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:21,969 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [690997600] [2021-05-02 12:53:21,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:21,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:22,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:22,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:22,084 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 12:53:22,084 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:22,084 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [690997600] [2021-05-02 12:53:22,084 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [690997600] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:22,084 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1748537119] [2021-05-02 12:53:22,084 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:22,143 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-02 12:53:22,143 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:22,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 12:53:22,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:22,233 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 12:53:22,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1748537119] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:22,234 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:22,234 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 13 [2021-05-02 12:53:22,234 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [87464093] [2021-05-02 12:53:22,234 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 12:53:22,234 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:22,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 12:53:22,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:53:22,235 INFO L87 Difference]: Start difference. First operand 46 states and 57 transitions. Second operand has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 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 12:53:22,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:22,512 INFO L93 Difference]: Finished difference Result 61 states and 72 transitions. [2021-05-02 12:53:22,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 12:53:22,517 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 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 22 [2021-05-02 12:53:22,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:22,518 INFO L225 Difference]: With dead ends: 61 [2021-05-02 12:53:22,518 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 12:53:22,518 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 291.5ms TimeCoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:53:22,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 12:53:22,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 47. [2021-05-02 12:53:22,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.2857142857142858) internal successors, (54), 42 states have internal predecessors, (54), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:22,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 58 transitions. [2021-05-02 12:53:22,524 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 58 transitions. Word has length 22 [2021-05-02 12:53:22,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:22,524 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 58 transitions. [2021-05-02 12:53:22,524 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 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 12:53:22,524 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 58 transitions. [2021-05-02 12:53:22,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 12:53:22,524 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:22,525 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:22,747 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 12:53:22,747 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:22,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:22,747 INFO L82 PathProgramCache]: Analyzing trace with hash 142103551, now seen corresponding path program 7 times [2021-05-02 12:53:22,747 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:22,748 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105377211] [2021-05-02 12:53:22,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:22,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:22,843 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:22,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:22,847 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 12:53:22,848 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:22,848 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105377211] [2021-05-02 12:53:22,848 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [105377211] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:22,848 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1113725972] [2021-05-02 12:53:22,848 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:22,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:22,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 12:53:22,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:22,948 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:22,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:22,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:22,995 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 12:53:22,995 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1113725972] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:22,995 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:22,995 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 11 [2021-05-02 12:53:22,996 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [121644053] [2021-05-02 12:53:22,996 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 12:53:22,996 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:22,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 12:53:22,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:53:22,997 INFO L87 Difference]: Start difference. First operand 47 states and 58 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:23,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:23,246 INFO L93 Difference]: Finished difference Result 80 states and 99 transitions. [2021-05-02 12:53:23,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 12:53:23,247 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-02 12:53:23,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:23,248 INFO L225 Difference]: With dead ends: 80 [2021-05-02 12:53:23,249 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 12:53:23,249 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 221.9ms TimeCoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-05-02 12:53:23,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 12:53:23,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 51. [2021-05-02 12:53:23,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.3043478260869565) internal successors, (60), 46 states have internal predecessors, (60), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:23,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 64 transitions. [2021-05-02 12:53:23,255 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 64 transitions. Word has length 23 [2021-05-02 12:53:23,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:23,255 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 64 transitions. [2021-05-02 12:53:23,255 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:23,256 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 64 transitions. [2021-05-02 12:53:23,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 12:53:23,256 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:23,256 INFO L523 BasicCegarLoop]: trace histogram [6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:23,471 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 12:53:23,471 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:23,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:23,471 INFO L82 PathProgramCache]: Analyzing trace with hash 1077971631, now seen corresponding path program 8 times [2021-05-02 12:53:23,471 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:23,472 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1498561662] [2021-05-02 12:53:23,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:23,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:23,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:23,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:23,623 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:53:23,623 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:23,623 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1498561662] [2021-05-02 12:53:23,623 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1498561662] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:23,623 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1612249072] [2021-05-02 12:53:23,623 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:23,659 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:53:23,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:23,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 12:53:23,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:23,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:23,737 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:53:23,737 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1612249072] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:23,737 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:23,737 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 12:53:23,737 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965148976] [2021-05-02 12:53:23,737 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 12:53:23,737 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:23,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 12:53:23,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:53:23,738 INFO L87 Difference]: Start difference. First operand 51 states and 64 transitions. Second operand has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 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 12:53:24,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:24,169 INFO L93 Difference]: Finished difference Result 81 states and 108 transitions. [2021-05-02 12:53:24,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 12:53:24,170 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 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 23 [2021-05-02 12:53:24,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:24,170 INFO L225 Difference]: With dead ends: 81 [2021-05-02 12:53:24,170 INFO L226 Difference]: Without dead ends: 73 [2021-05-02 12:53:24,171 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 337.5ms TimeCoverageRelationStatistics Valid=74, Invalid=432, Unknown=0, NotChecked=0, Total=506 [2021-05-02 12:53:24,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-05-02 12:53:24,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 57. [2021-05-02 12:53:24,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.3076923076923077) internal successors, (68), 52 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:24,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 72 transitions. [2021-05-02 12:53:24,177 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 72 transitions. Word has length 23 [2021-05-02 12:53:24,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:24,177 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 72 transitions. [2021-05-02 12:53:24,177 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 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 12:53:24,177 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 72 transitions. [2021-05-02 12:53:24,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 12:53:24,178 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:24,178 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:24,401 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:24,402 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:24,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:24,402 INFO L82 PathProgramCache]: Analyzing trace with hash 1773782399, now seen corresponding path program 9 times [2021-05-02 12:53:24,402 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:24,402 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150890481] [2021-05-02 12:53:24,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:24,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:24,530 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:24,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:24,536 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 12:53:24,536 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:24,536 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [150890481] [2021-05-02 12:53:24,536 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [150890481] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:24,537 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1579951363] [2021-05-02 12:53:24,537 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:24,594 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 12:53:24,594 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:24,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 12:53:24,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:24,689 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 12:53:24,689 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1579951363] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:24,689 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:24,689 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 15 [2021-05-02 12:53:24,689 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1507559941] [2021-05-02 12:53:24,689 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 12:53:24,689 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:24,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 12:53:24,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-05-02 12:53:24,690 INFO L87 Difference]: Start difference. First operand 57 states and 72 transitions. Second operand has 15 states, 15 states have (on average 1.6) internal successors, (24), 14 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 12:53:24,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:24,999 INFO L93 Difference]: Finished difference Result 66 states and 80 transitions. [2021-05-02 12:53:24,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 12:53:24,999 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 14 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 24 [2021-05-02 12:53:25,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:25,001 INFO L225 Difference]: With dead ends: 66 [2021-05-02 12:53:25,001 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 12:53:25,001 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 336.4ms TimeCoverageRelationStatistics Valid=79, Invalid=427, Unknown=0, NotChecked=0, Total=506 [2021-05-02 12:53:25,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 12:53:25,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-05-02 12:53:25,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.3043478260869565) internal successors, (60), 46 states have internal predecessors, (60), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:25,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 64 transitions. [2021-05-02 12:53:25,007 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 64 transitions. Word has length 24 [2021-05-02 12:53:25,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:25,007 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 64 transitions. [2021-05-02 12:53:25,007 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 14 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 12:53:25,007 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 64 transitions. [2021-05-02 12:53:25,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 12:53:25,008 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:25,008 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:25,213 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-05-02 12:53:25,213 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:25,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:25,213 INFO L82 PathProgramCache]: Analyzing trace with hash 243885709, now seen corresponding path program 10 times [2021-05-02 12:53:25,213 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:25,213 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [533331718] [2021-05-02 12:53:25,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:25,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:25,332 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:25,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:25,335 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-05-02 12:53:25,336 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:25,336 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [533331718] [2021-05-02 12:53:25,336 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [533331718] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:25,336 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1493923499] [2021-05-02 12:53:25,336 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:25,383 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:53:25,384 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:25,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 12:53:25,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:25,498 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-05-02 12:53:25,498 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1493923499] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:25,498 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:25,498 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 14 [2021-05-02 12:53:25,498 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636495280] [2021-05-02 12:53:25,499 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 12:53:25,499 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:25,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 12:53:25,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:53:25,500 INFO L87 Difference]: Start difference. First operand 51 states and 64 transitions. Second operand has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 13 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:25,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:25,826 INFO L93 Difference]: Finished difference Result 68 states and 81 transitions. [2021-05-02 12:53:25,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 12:53:25,826 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 13 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2021-05-02 12:53:25,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:25,827 INFO L225 Difference]: With dead ends: 68 [2021-05-02 12:53:25,827 INFO L226 Difference]: Without dead ends: 58 [2021-05-02 12:53:25,827 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 327.9ms TimeCoverageRelationStatistics Valid=78, Invalid=384, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:53:25,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-02 12:53:25,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 52. [2021-05-02 12:53:25,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.297872340425532) internal successors, (61), 47 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:25,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 65 transitions. [2021-05-02 12:53:25,832 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 65 transitions. Word has length 24 [2021-05-02 12:53:25,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:25,832 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 65 transitions. [2021-05-02 12:53:25,833 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 13 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:25,833 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 65 transitions. [2021-05-02 12:53:25,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 12:53:25,833 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:25,833 INFO L523 BasicCegarLoop]: trace histogram [7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:26,055 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:26,056 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:26,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:26,056 INFO L82 PathProgramCache]: Analyzing trace with hash -1486168978, now seen corresponding path program 11 times [2021-05-02 12:53:26,056 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:26,056 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [305061602] [2021-05-02 12:53:26,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:26,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:26,203 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:26,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:26,207 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:53:26,207 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:26,207 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [305061602] [2021-05-02 12:53:26,207 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [305061602] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:26,207 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [938982184] [2021-05-02 12:53:26,207 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:26,281 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-02 12:53:26,282 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:26,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 12:53:26,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:26,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:26,354 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:53:26,354 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [938982184] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:26,354 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:26,354 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 12:53:26,354 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [924279792] [2021-05-02 12:53:26,355 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 12:53:26,355 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:26,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 12:53:26,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:53:26,356 INFO L87 Difference]: Start difference. First operand 52 states and 65 transitions. Second operand has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 13 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:26,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:26,849 INFO L93 Difference]: Finished difference Result 83 states and 111 transitions. [2021-05-02 12:53:26,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 12:53:26,849 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 13 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2021-05-02 12:53:26,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:26,850 INFO L225 Difference]: With dead ends: 83 [2021-05-02 12:53:26,850 INFO L226 Difference]: Without dead ends: 75 [2021-05-02 12:53:26,850 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 412.8ms TimeCoverageRelationStatistics Valid=80, Invalid=520, Unknown=0, NotChecked=0, Total=600 [2021-05-02 12:53:26,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-05-02 12:53:26,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 58. [2021-05-02 12:53:26,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.3018867924528301) internal successors, (69), 53 states have internal predecessors, (69), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:26,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 73 transitions. [2021-05-02 12:53:26,855 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 73 transitions. Word has length 24 [2021-05-02 12:53:26,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:26,855 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 73 transitions. [2021-05-02 12:53:26,855 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 13 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:26,855 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 73 transitions. [2021-05-02 12:53:26,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 12:53:26,856 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:26,856 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:27,061 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 12:53:27,062 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:27,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:27,062 INFO L82 PathProgramCache]: Analyzing trace with hash -2034209681, now seen corresponding path program 12 times [2021-05-02 12:53:27,062 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:27,062 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [111738006] [2021-05-02 12:53:27,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:27,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:27,184 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:27,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:27,188 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-05-02 12:53:27,188 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:27,188 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [111738006] [2021-05-02 12:53:27,188 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [111738006] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:27,188 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [681694854] [2021-05-02 12:53:27,188 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:27,263 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-02 12:53:27,263 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:27,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 12:53:27,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:27,396 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-05-02 12:53:27,397 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [681694854] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:27,397 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:27,397 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 16 [2021-05-02 12:53:27,397 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [431073711] [2021-05-02 12:53:27,399 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 12:53:27,399 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:27,401 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 12:53:27,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:53:27,402 INFO L87 Difference]: Start difference. First operand 58 states and 73 transitions. Second operand has 16 states, 16 states have (on average 1.5) internal successors, (24), 15 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 12:53:27,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:27,851 INFO L93 Difference]: Finished difference Result 75 states and 90 transitions. [2021-05-02 12:53:27,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 12:53:27,852 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 15 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-05-02 12:53:27,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:27,852 INFO L225 Difference]: With dead ends: 75 [2021-05-02 12:53:27,852 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 12:53:27,853 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 435.6ms TimeCoverageRelationStatistics Valid=94, Invalid=506, Unknown=0, NotChecked=0, Total=600 [2021-05-02 12:53:27,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 12:53:27,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 59. [2021-05-02 12:53:27,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.2962962962962963) internal successors, (70), 54 states have internal predecessors, (70), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:27,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 74 transitions. [2021-05-02 12:53:27,860 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 74 transitions. Word has length 25 [2021-05-02 12:53:27,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:27,860 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 74 transitions. [2021-05-02 12:53:27,860 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 15 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 12:53:27,860 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 74 transitions. [2021-05-02 12:53:27,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 12:53:27,860 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:27,861 INFO L523 BasicCegarLoop]: trace histogram [8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:28,077 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-02 12:53:28,077 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:28,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:28,077 INFO L82 PathProgramCache]: Analyzing trace with hash 629850767, now seen corresponding path program 13 times [2021-05-02 12:53:28,077 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:28,078 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1605606157] [2021-05-02 12:53:28,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:28,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:28,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:28,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:28,255 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:53:28,255 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:28,255 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1605606157] [2021-05-02 12:53:28,255 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1605606157] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:28,255 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [294853193] [2021-05-02 12:53:28,255 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:28,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:28,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 12:53:28,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:28,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:28,385 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:53:28,385 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [294853193] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:28,385 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:28,386 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-02 12:53:28,386 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1664258787] [2021-05-02 12:53:28,386 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 12:53:28,386 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:28,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 12:53:28,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2021-05-02 12:53:28,387 INFO L87 Difference]: Start difference. First operand 59 states and 74 transitions. Second operand has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 14 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:28,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:28,960 INFO L93 Difference]: Finished difference Result 91 states and 122 transitions. [2021-05-02 12:53:28,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 12:53:28,962 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 14 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-05-02 12:53:28,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:28,963 INFO L225 Difference]: With dead ends: 91 [2021-05-02 12:53:28,963 INFO L226 Difference]: Without dead ends: 83 [2021-05-02 12:53:28,963 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 439.4ms TimeCoverageRelationStatistics Valid=86, Invalid=616, Unknown=0, NotChecked=0, Total=702 [2021-05-02 12:53:28,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-02 12:53:28,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 65. [2021-05-02 12:53:28,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 60 states have (on average 1.3) internal successors, (78), 60 states have internal predecessors, (78), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:28,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 82 transitions. [2021-05-02 12:53:28,970 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 82 transitions. Word has length 25 [2021-05-02 12:53:28,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:28,970 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 82 transitions. [2021-05-02 12:53:28,970 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 14 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:28,970 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 82 transitions. [2021-05-02 12:53:28,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 12:53:28,971 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:28,971 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:29,184 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 12:53:29,185 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:29,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:29,185 INFO L82 PathProgramCache]: Analyzing trace with hash 359277261, now seen corresponding path program 14 times [2021-05-02 12:53:29,185 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:29,185 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [165281198] [2021-05-02 12:53:29,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:29,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:29,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:29,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:29,328 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-05-02 12:53:29,328 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:29,328 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [165281198] [2021-05-02 12:53:29,328 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [165281198] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:29,328 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [685126353] [2021-05-02 12:53:29,328 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:29,386 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:53:29,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:29,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 12:53:29,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:29,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:29,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:29,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:29,465 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-05-02 12:53:29,466 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [685126353] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:29,466 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:29,466 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 12 [2021-05-02 12:53:29,466 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103250545] [2021-05-02 12:53:29,466 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 12:53:29,466 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:29,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 12:53:29,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:53:29,467 INFO L87 Difference]: Start difference. First operand 65 states and 82 transitions. Second operand has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:29,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:29,850 INFO L93 Difference]: Finished difference Result 125 states and 159 transitions. [2021-05-02 12:53:29,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 12:53:29,850 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-02 12:53:29,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:29,851 INFO L225 Difference]: With dead ends: 125 [2021-05-02 12:53:29,851 INFO L226 Difference]: Without dead ends: 115 [2021-05-02 12:53:29,851 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 301.4ms TimeCoverageRelationStatistics Valid=56, Invalid=286, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:53:29,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-05-02 12:53:29,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 69. [2021-05-02 12:53:29,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 64 states have (on average 1.3125) internal successors, (84), 64 states have internal predecessors, (84), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:29,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 88 transitions. [2021-05-02 12:53:29,860 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 88 transitions. Word has length 26 [2021-05-02 12:53:29,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:29,860 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 88 transitions. [2021-05-02 12:53:29,861 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:29,861 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 88 transitions. [2021-05-02 12:53:29,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 12:53:29,861 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:29,861 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:30,083 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-05-02 12:53:30,083 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:30,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:30,084 INFO L82 PathProgramCache]: Analyzing trace with hash 177120127, now seen corresponding path program 15 times [2021-05-02 12:53:30,084 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:30,084 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1262869498] [2021-05-02 12:53:30,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:30,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:30,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:30,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:30,212 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:53:30,212 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:30,212 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1262869498] [2021-05-02 12:53:30,212 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1262869498] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:30,212 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1000724955] [2021-05-02 12:53:30,212 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:30,314 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 12:53:30,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:30,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 12:53:30,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:30,430 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:53:30,430 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1000724955] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:30,430 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:30,430 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 15 [2021-05-02 12:53:30,431 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702415561] [2021-05-02 12:53:30,432 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 12:53:30,432 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:30,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 12:53:30,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2021-05-02 12:53:30,434 INFO L87 Difference]: Start difference. First operand 69 states and 88 transitions. Second operand has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 14 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:30,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:30,877 INFO L93 Difference]: Finished difference Result 88 states and 107 transitions. [2021-05-02 12:53:30,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 12:53:30,877 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 14 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-02 12:53:30,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:30,878 INFO L225 Difference]: With dead ends: 88 [2021-05-02 12:53:30,878 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 12:53:30,878 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 387.8ms TimeCoverageRelationStatistics Valid=98, Invalid=552, Unknown=0, NotChecked=0, Total=650 [2021-05-02 12:53:30,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 12:53:30,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 70. [2021-05-02 12:53:30,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 65 states have (on average 1.3076923076923077) internal successors, (85), 65 states have internal predecessors, (85), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:30,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 89 transitions. [2021-05-02 12:53:30,885 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 89 transitions. Word has length 26 [2021-05-02 12:53:30,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:30,885 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 89 transitions. [2021-05-02 12:53:30,885 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 14 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:30,885 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 89 transitions. [2021-05-02 12:53:30,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 12:53:30,885 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:30,885 INFO L523 BasicCegarLoop]: trace histogram [9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:31,100 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 12:53:31,101 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:31,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:31,101 INFO L82 PathProgramCache]: Analyzing trace with hash 1801953422, now seen corresponding path program 16 times [2021-05-02 12:53:31,101 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:31,101 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1088756655] [2021-05-02 12:53:31,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:31,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:31,303 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:31,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:31,312 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:53:31,313 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:31,313 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1088756655] [2021-05-02 12:53:31,313 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1088756655] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:31,313 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1137897635] [2021-05-02 12:53:31,313 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:31,364 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:53:31,364 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:31,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 12:53:31,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:31,422 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:31,431 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:53:31,431 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1137897635] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:31,432 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:31,432 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 12:53:31,432 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1383140943] [2021-05-02 12:53:31,432 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 12:53:31,432 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:31,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 12:53:31,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:53:31,433 INFO L87 Difference]: Start difference. First operand 70 states and 89 transitions. Second operand has 16 states, 16 states have (on average 1.5) internal successors, (24), 15 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 12:53:32,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:32,077 INFO L93 Difference]: Finished difference Result 109 states and 149 transitions. [2021-05-02 12:53:32,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 12:53:32,077 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 15 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 26 [2021-05-02 12:53:32,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:32,078 INFO L225 Difference]: With dead ends: 109 [2021-05-02 12:53:32,078 INFO L226 Difference]: Without dead ends: 101 [2021-05-02 12:53:32,078 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 476.0ms TimeCoverageRelationStatistics Valid=92, Invalid=720, Unknown=0, NotChecked=0, Total=812 [2021-05-02 12:53:32,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-05-02 12:53:32,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 76. [2021-05-02 12:53:32,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.3098591549295775) internal successors, (93), 71 states have internal predecessors, (93), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:32,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 97 transitions. [2021-05-02 12:53:32,085 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 97 transitions. Word has length 26 [2021-05-02 12:53:32,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:32,085 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 97 transitions. [2021-05-02 12:53:32,085 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 15 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 12:53:32,085 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 97 transitions. [2021-05-02 12:53:32,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 12:53:32,085 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:32,086 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:32,286 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:32,286 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:32,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:32,287 INFO L82 PathProgramCache]: Analyzing trace with hash 1542928431, now seen corresponding path program 17 times [2021-05-02 12:53:32,287 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:32,287 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [925826348] [2021-05-02 12:53:32,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:32,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:32,424 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:32,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:32,428 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-05-02 12:53:32,428 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:32,428 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [925826348] [2021-05-02 12:53:32,428 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [925826348] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:32,428 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [39122742] [2021-05-02 12:53:32,428 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:32,524 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-02 12:53:32,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:32,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 12:53:32,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:32,686 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-05-02 12:53:32,687 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [39122742] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:32,687 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:32,687 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 18 [2021-05-02 12:53:32,687 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158115440] [2021-05-02 12:53:32,687 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 12:53:32,687 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:32,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 12:53:32,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:53:32,688 INFO L87 Difference]: Start difference. First operand 76 states and 97 transitions. Second operand has 18 states, 18 states have (on average 1.5) internal successors, (27), 17 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:33,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:33,069 INFO L93 Difference]: Finished difference Result 86 states and 106 transitions. [2021-05-02 12:53:33,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 12:53:33,069 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.5) internal successors, (27), 17 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2021-05-02 12:53:33,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:33,069 INFO L225 Difference]: With dead ends: 86 [2021-05-02 12:53:33,070 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 12:53:33,070 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 428.7ms TimeCoverageRelationStatistics Valid=98, Invalid=658, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:53:33,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 12:53:33,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-05-02 12:53:33,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 64 states have (on average 1.3125) internal successors, (84), 64 states have internal predecessors, (84), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:33,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 88 transitions. [2021-05-02 12:53:33,077 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 88 transitions. Word has length 27 [2021-05-02 12:53:33,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:33,077 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 88 transitions. [2021-05-02 12:53:33,077 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.5) internal successors, (27), 17 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:33,077 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 88 transitions. [2021-05-02 12:53:33,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 12:53:33,078 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:33,078 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:33,285 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:33,285 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:33,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:33,285 INFO L82 PathProgramCache]: Analyzing trace with hash -921018945, now seen corresponding path program 18 times [2021-05-02 12:53:33,285 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:33,285 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2051713370] [2021-05-02 12:53:33,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:33,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:33,417 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:33,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:33,421 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:53:33,421 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:33,421 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2051713370] [2021-05-02 12:53:33,421 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2051713370] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:33,421 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1728947534] [2021-05-02 12:53:33,421 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:33,627 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-02 12:53:33,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:33,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 12:53:33,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:33,736 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:53:33,737 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1728947534] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:33,737 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:33,737 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 17 [2021-05-02 12:53:33,737 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574945561] [2021-05-02 12:53:33,737 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 12:53:33,737 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:33,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 12:53:33,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-05-02 12:53:33,738 INFO L87 Difference]: Start difference. First operand 69 states and 88 transitions. Second operand has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 16 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:34,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:34,233 INFO L93 Difference]: Finished difference Result 88 states and 107 transitions. [2021-05-02 12:53:34,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 12:53:34,234 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 16 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2021-05-02 12:53:34,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:34,234 INFO L225 Difference]: With dead ends: 88 [2021-05-02 12:53:34,234 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 12:53:34,235 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 455.6ms TimeCoverageRelationStatistics Valid=100, Invalid=602, Unknown=0, NotChecked=0, Total=702 [2021-05-02 12:53:34,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 12:53:34,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 70. [2021-05-02 12:53:34,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 65 states have (on average 1.3076923076923077) internal successors, (85), 65 states have internal predecessors, (85), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:34,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 89 transitions. [2021-05-02 12:53:34,241 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 89 transitions. Word has length 27 [2021-05-02 12:53:34,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:34,241 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 89 transitions. [2021-05-02 12:53:34,241 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 16 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:34,241 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 89 transitions. [2021-05-02 12:53:34,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 12:53:34,241 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:34,241 INFO L523 BasicCegarLoop]: trace histogram [10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:34,442 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:34,442 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:34,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:34,442 INFO L82 PathProgramCache]: Analyzing trace with hash -517569937, now seen corresponding path program 19 times [2021-05-02 12:53:34,442 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:34,442 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [415146304] [2021-05-02 12:53:34,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:34,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:34,663 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:34,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:34,667 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:53:34,667 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:34,667 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [415146304] [2021-05-02 12:53:34,667 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [415146304] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:34,667 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [917397483] [2021-05-02 12:53:34,667 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:34,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:34,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 12:53:34,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:34,773 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:34,783 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:53:34,784 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [917397483] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:34,784 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:34,784 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 12:53:34,784 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [223433568] [2021-05-02 12:53:34,784 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 12:53:34,784 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:34,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 12:53:34,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=239, Unknown=0, NotChecked=0, Total=272 [2021-05-02 12:53:34,786 INFO L87 Difference]: Start difference. First operand 70 states and 89 transitions. Second operand has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 16 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:35,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:35,581 INFO L93 Difference]: Finished difference Result 110 states and 151 transitions. [2021-05-02 12:53:35,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 12:53:35,581 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 16 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2021-05-02 12:53:35,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:35,582 INFO L225 Difference]: With dead ends: 110 [2021-05-02 12:53:35,582 INFO L226 Difference]: Without dead ends: 102 [2021-05-02 12:53:35,583 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 629.6ms TimeCoverageRelationStatistics Valid=98, Invalid=832, Unknown=0, NotChecked=0, Total=930 [2021-05-02 12:53:35,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-05-02 12:53:35,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 76. [2021-05-02 12:53:35,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.3098591549295775) internal successors, (93), 71 states have internal predecessors, (93), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:35,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 97 transitions. [2021-05-02 12:53:35,591 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 97 transitions. Word has length 27 [2021-05-02 12:53:35,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:35,591 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 97 transitions. [2021-05-02 12:53:35,591 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 16 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:35,591 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 97 transitions. [2021-05-02 12:53:35,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 12:53:35,592 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:35,592 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:35,804 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-05-02 12:53:35,805 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:35,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:35,805 INFO L82 PathProgramCache]: Analyzing trace with hash -603591809, now seen corresponding path program 20 times [2021-05-02 12:53:35,805 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:35,805 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1845820032] [2021-05-02 12:53:35,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:35,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:35,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:35,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:35,965 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:53:35,965 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:35,965 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1845820032] [2021-05-02 12:53:35,965 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1845820032] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:35,965 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [243081220] [2021-05-02 12:53:35,966 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:36,028 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:53:36,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:36,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-02 12:53:36,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:36,186 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:53:36,186 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [243081220] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:36,186 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:36,186 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 19 [2021-05-02 12:53:36,187 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506996324] [2021-05-02 12:53:36,187 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 12:53:36,187 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:36,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 12:53:36,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=289, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:53:36,188 INFO L87 Difference]: Start difference. First operand 76 states and 97 transitions. Second operand has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:36,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:36,696 INFO L93 Difference]: Finished difference Result 95 states and 116 transitions. [2021-05-02 12:53:36,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 12:53:36,696 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2021-05-02 12:53:36,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:36,697 INFO L225 Difference]: With dead ends: 95 [2021-05-02 12:53:36,697 INFO L226 Difference]: Without dead ends: 84 [2021-05-02 12:53:36,697 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 510.8ms TimeCoverageRelationStatistics Valid=116, Invalid=754, Unknown=0, NotChecked=0, Total=870 [2021-05-02 12:53:36,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-02 12:53:36,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 77. [2021-05-02 12:53:36,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.3055555555555556) internal successors, (94), 72 states have internal predecessors, (94), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:36,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 98 transitions. [2021-05-02 12:53:36,705 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 98 transitions. Word has length 28 [2021-05-02 12:53:36,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:36,705 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 98 transitions. [2021-05-02 12:53:36,705 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:36,705 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 98 transitions. [2021-05-02 12:53:36,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 12:53:36,706 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:36,706 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:36,922 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:36,922 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:36,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:36,923 INFO L82 PathProgramCache]: Analyzing trace with hash -1955495667, now seen corresponding path program 21 times [2021-05-02 12:53:36,923 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:36,923 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [540279416] [2021-05-02 12:53:36,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:36,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:37,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:37,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:37,192 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-05-02 12:53:37,192 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:37,192 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [540279416] [2021-05-02 12:53:37,192 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [540279416] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:37,192 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2127273563] [2021-05-02 12:53:37,192 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:37,346 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 12:53:37,346 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:37,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 12:53:37,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:37,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:37,357 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:37,365 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:37,368 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:37,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:37,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:37,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:37,382 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:37,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:37,433 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-05-02 12:53:37,433 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2127273563] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:37,433 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:37,433 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 12:53:37,433 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146836406] [2021-05-02 12:53:37,434 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 12:53:37,434 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:37,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 12:53:37,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:53:37,434 INFO L87 Difference]: Start difference. First operand 77 states and 98 transitions. Second operand has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 13 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:37,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:37,875 INFO L93 Difference]: Finished difference Result 98 states and 119 transitions. [2021-05-02 12:53:37,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 12:53:37,876 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 13 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2021-05-02 12:53:37,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:37,876 INFO L225 Difference]: With dead ends: 98 [2021-05-02 12:53:37,876 INFO L226 Difference]: Without dead ends: 86 [2021-05-02 12:53:37,877 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 501.3ms TimeCoverageRelationStatistics Valid=91, Invalid=559, Unknown=0, NotChecked=0, Total=650 [2021-05-02 12:53:37,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-02 12:53:37,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 78. [2021-05-02 12:53:37,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 73 states have (on average 1.3013698630136987) internal successors, (95), 73 states have internal predecessors, (95), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:37,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 99 transitions. [2021-05-02 12:53:37,883 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 99 transitions. Word has length 28 [2021-05-02 12:53:37,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:37,884 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 99 transitions. [2021-05-02 12:53:37,884 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 13 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:37,884 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 99 transitions. [2021-05-02 12:53:37,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 12:53:37,884 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:37,884 INFO L523 BasicCegarLoop]: trace histogram [11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:38,096 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-02 12:53:38,097 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:38,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:38,097 INFO L82 PathProgramCache]: Analyzing trace with hash 591649966, now seen corresponding path program 22 times [2021-05-02 12:53:38,097 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:38,097 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [840944706] [2021-05-02 12:53:38,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:38,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:38,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:38,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:38,306 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 67 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:53:38,306 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:38,306 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [840944706] [2021-05-02 12:53:38,306 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [840944706] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:38,306 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1922087536] [2021-05-02 12:53:38,306 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:38,344 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:53:38,344 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:38,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-02 12:53:38,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:38,444 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 67 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:53:38,444 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1922087536] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:38,444 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:38,444 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 19 [2021-05-02 12:53:38,445 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616282598] [2021-05-02 12:53:38,445 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 12:53:38,445 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:38,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 12:53:38,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=301, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:53:38,445 INFO L87 Difference]: Start difference. First operand 78 states and 99 transitions. Second operand has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:39,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:39,219 INFO L93 Difference]: Finished difference Result 119 states and 163 transitions. [2021-05-02 12:53:39,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 12:53:39,219 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2021-05-02 12:53:39,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:39,220 INFO L225 Difference]: With dead ends: 119 [2021-05-02 12:53:39,220 INFO L226 Difference]: Without dead ends: 111 [2021-05-02 12:53:39,221 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 582.1ms TimeCoverageRelationStatistics Valid=110, Invalid=1012, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 12:53:39,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-05-02 12:53:39,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 84. [2021-05-02 12:53:39,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 79 states have (on average 1.3037974683544304) internal successors, (103), 79 states have internal predecessors, (103), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:39,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 107 transitions. [2021-05-02 12:53:39,229 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 107 transitions. Word has length 28 [2021-05-02 12:53:39,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:39,229 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 107 transitions. [2021-05-02 12:53:39,229 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:39,229 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 107 transitions. [2021-05-02 12:53:39,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 12:53:39,230 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:39,230 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:39,441 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:39,441 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:39,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:39,441 INFO L82 PathProgramCache]: Analyzing trace with hash 646714815, now seen corresponding path program 23 times [2021-05-02 12:53:39,441 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:39,441 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [979030137] [2021-05-02 12:53:39,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:39,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:39,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:39,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:39,575 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:53:39,576 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:39,576 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [979030137] [2021-05-02 12:53:39,576 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [979030137] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:39,576 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2039835000] [2021-05-02 12:53:39,576 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:39,781 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-02 12:53:39,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:39,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 12:53:39,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:39,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:39,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:39,826 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:39,855 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:53:39,856 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2039835000] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:39,856 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:39,856 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 13 [2021-05-02 12:53:39,856 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481853310] [2021-05-02 12:53:39,857 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 12:53:39,857 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:39,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 12:53:39,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:53:39,857 INFO L87 Difference]: Start difference. First operand 84 states and 107 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:40,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:40,226 INFO L93 Difference]: Finished difference Result 179 states and 231 transitions. [2021-05-02 12:53:40,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 12:53:40,227 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 12:53:40,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:40,227 INFO L225 Difference]: With dead ends: 179 [2021-05-02 12:53:40,227 INFO L226 Difference]: Without dead ends: 168 [2021-05-02 12:53:40,228 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 309.0ms TimeCoverageRelationStatistics Valid=62, Invalid=358, Unknown=0, NotChecked=0, Total=420 [2021-05-02 12:53:40,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-05-02 12:53:40,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 88. [2021-05-02 12:53:40,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 83 states have (on average 1.3132530120481927) internal successors, (109), 83 states have internal predecessors, (109), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:40,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 113 transitions. [2021-05-02 12:53:40,238 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 113 transitions. Word has length 29 [2021-05-02 12:53:40,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:40,238 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 113 transitions. [2021-05-02 12:53:40,238 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:40,238 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 113 transitions. [2021-05-02 12:53:40,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 12:53:40,238 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:40,238 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:40,441 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 12:53:40,442 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:40,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:40,442 INFO L82 PathProgramCache]: Analyzing trace with hash 1573757487, now seen corresponding path program 24 times [2021-05-02 12:53:40,442 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:40,442 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [715996115] [2021-05-02 12:53:40,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:40,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:40,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:40,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:40,596 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-05-02 12:53:40,596 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:40,596 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [715996115] [2021-05-02 12:53:40,596 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [715996115] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:40,596 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1333909364] [2021-05-02 12:53:40,596 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:40,702 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-02 12:53:40,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:40,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 12:53:40,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:40,750 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:40,763 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-05-02 12:53:40,764 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1333909364] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:40,764 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:40,764 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-02 12:53:40,764 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92271369] [2021-05-02 12:53:40,765 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 12:53:40,765 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:40,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 12:53:40,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=179, Unknown=0, NotChecked=0, Total=210 [2021-05-02 12:53:40,765 INFO L87 Difference]: Start difference. First operand 88 states and 113 transitions. Second operand has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 14 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:41,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:41,394 INFO L93 Difference]: Finished difference Result 109 states and 134 transitions. [2021-05-02 12:53:41,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 12:53:41,395 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 14 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 12:53:41,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:41,395 INFO L225 Difference]: With dead ends: 109 [2021-05-02 12:53:41,395 INFO L226 Difference]: Without dead ends: 97 [2021-05-02 12:53:41,397 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 542.2ms TimeCoverageRelationStatistics Valid=108, Invalid=704, Unknown=0, NotChecked=0, Total=812 [2021-05-02 12:53:41,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-05-02 12:53:41,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 89. [2021-05-02 12:53:41,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 84 states have (on average 1.3095238095238095) internal successors, (110), 84 states have internal predecessors, (110), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:41,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 114 transitions. [2021-05-02 12:53:41,407 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 114 transitions. Word has length 29 [2021-05-02 12:53:41,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:41,407 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 114 transitions. [2021-05-02 12:53:41,407 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 14 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:41,407 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 114 transitions. [2021-05-02 12:53:41,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 12:53:41,408 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:41,408 INFO L523 BasicCegarLoop]: trace histogram [12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:41,630 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:41,631 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:41,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:41,631 INFO L82 PathProgramCache]: Analyzing trace with hash 617728591, now seen corresponding path program 25 times [2021-05-02 12:53:41,631 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:41,631 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [366857544] [2021-05-02 12:53:41,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:41,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:41,866 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:41,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:41,869 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 79 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:53:41,869 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:41,869 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [366857544] [2021-05-02 12:53:41,869 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [366857544] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:41,869 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1124302563] [2021-05-02 12:53:41,869 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:41,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:41,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 12:53:41,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:41,973 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:41,981 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 79 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:53:41,981 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1124302563] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:41,981 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:41,981 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 12:53:41,982 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873279407] [2021-05-02 12:53:41,982 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 12:53:41,982 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:41,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 12:53:41,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=305, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:53:41,982 INFO L87 Difference]: Start difference. First operand 89 states and 114 transitions. Second operand has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:42,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:42,824 INFO L93 Difference]: Finished difference Result 138 states and 192 transitions. [2021-05-02 12:53:42,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 12:53:42,825 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 12:53:42,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:42,825 INFO L225 Difference]: With dead ends: 138 [2021-05-02 12:53:42,825 INFO L226 Difference]: Without dead ends: 130 [2021-05-02 12:53:42,826 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 626.7ms TimeCoverageRelationStatistics Valid=110, Invalid=1080, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 12:53:42,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-05-02 12:53:42,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 95. [2021-05-02 12:53:42,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 90 states have (on average 1.3111111111111111) internal successors, (118), 90 states have internal predecessors, (118), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:42,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 122 transitions. [2021-05-02 12:53:42,835 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 122 transitions. Word has length 29 [2021-05-02 12:53:42,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:42,835 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 122 transitions. [2021-05-02 12:53:42,835 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:42,835 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 122 transitions. [2021-05-02 12:53:42,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 12:53:42,836 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:42,836 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:43,036 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-02 12:53:43,036 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:43,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:43,037 INFO L82 PathProgramCache]: Analyzing trace with hash 751514495, now seen corresponding path program 26 times [2021-05-02 12:53:43,037 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:43,037 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [758075149] [2021-05-02 12:53:43,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:43,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:43,208 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:43,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:43,212 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:53:43,212 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:43,212 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [758075149] [2021-05-02 12:53:43,212 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [758075149] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:43,212 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1325210942] [2021-05-02 12:53:43,212 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:43,252 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:53:43,252 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:43,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 36 conjunts are in the unsatisfiable core [2021-05-02 12:53:43,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:43,433 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:53:43,434 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1325210942] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:43,434 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:43,434 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 21 [2021-05-02 12:53:43,434 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905793684] [2021-05-02 12:53:43,434 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 12:53:43,434 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:43,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 12:53:43,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=369, Unknown=0, NotChecked=0, Total=420 [2021-05-02 12:53:43,435 INFO L87 Difference]: Start difference. First operand 95 states and 122 transitions. Second operand has 21 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 20 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 12:53:43,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:43,878 INFO L93 Difference]: Finished difference Result 106 states and 132 transitions. [2021-05-02 12:53:43,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 12:53:43,878 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 20 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 30 [2021-05-02 12:53:43,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:43,879 INFO L225 Difference]: With dead ends: 106 [2021-05-02 12:53:43,879 INFO L226 Difference]: Without dead ends: 87 [2021-05-02 12:53:43,879 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 575.2ms TimeCoverageRelationStatistics Valid=117, Invalid=939, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 12:53:43,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-02 12:53:43,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2021-05-02 12:53:43,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.3170731707317074) internal successors, (108), 82 states have internal predecessors, (108), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:43,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 112 transitions. [2021-05-02 12:53:43,886 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 112 transitions. Word has length 30 [2021-05-02 12:53:43,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:43,887 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 112 transitions. [2021-05-02 12:53:43,887 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 20 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 12:53:43,887 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 112 transitions. [2021-05-02 12:53:43,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 12:53:43,887 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:43,887 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:44,092 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-02 12:53:44,093 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:44,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:44,094 INFO L82 PathProgramCache]: Analyzing trace with hash -688544435, now seen corresponding path program 27 times [2021-05-02 12:53:44,094 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:44,094 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [405916536] [2021-05-02 12:53:44,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:44,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:44,260 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:44,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:44,269 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-05-02 12:53:44,269 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:44,269 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [405916536] [2021-05-02 12:53:44,269 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [405916536] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:44,269 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1014445291] [2021-05-02 12:53:44,269 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:44,379 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 12:53:44,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:44,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 12:53:44,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:44,539 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-05-02 12:53:44,539 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1014445291] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:44,539 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:44,539 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 20 [2021-05-02 12:53:44,539 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12159726] [2021-05-02 12:53:44,540 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 12:53:44,540 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:44,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 12:53:44,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=325, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:53:44,540 INFO L87 Difference]: Start difference. First operand 87 states and 112 transitions. Second operand has 20 states, 20 states have (on average 1.4) internal successors, (28), 19 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:45,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:45,111 INFO L93 Difference]: Finished difference Result 108 states and 133 transitions. [2021-05-02 12:53:45,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 12:53:45,112 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.4) internal successors, (28), 19 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 30 [2021-05-02 12:53:45,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:45,113 INFO L225 Difference]: With dead ends: 108 [2021-05-02 12:53:45,113 INFO L226 Difference]: Without dead ends: 96 [2021-05-02 12:53:45,113 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 556.9ms TimeCoverageRelationStatistics Valid=122, Invalid=870, Unknown=0, NotChecked=0, Total=992 [2021-05-02 12:53:45,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-02 12:53:45,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 88. [2021-05-02 12:53:45,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 83 states have (on average 1.3132530120481927) internal successors, (109), 83 states have internal predecessors, (109), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:45,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 113 transitions. [2021-05-02 12:53:45,121 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 113 transitions. Word has length 30 [2021-05-02 12:53:45,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:45,121 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 113 transitions. [2021-05-02 12:53:45,121 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 1.4) internal successors, (28), 19 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:45,121 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 113 transitions. [2021-05-02 12:53:45,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 12:53:45,121 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:45,121 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:45,324 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,34 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:45,325 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:45,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:45,325 INFO L82 PathProgramCache]: Analyzing trace with hash 352108927, now seen corresponding path program 28 times [2021-05-02 12:53:45,325 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:45,325 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2018398933] [2021-05-02 12:53:45,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:45,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:45,477 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:45,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:45,486 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 12:53:45,486 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:45,486 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2018398933] [2021-05-02 12:53:45,486 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2018398933] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:45,486 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1149875535] [2021-05-02 12:53:45,486 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:45,549 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:53:45,549 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:45,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 12:53:45,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:45,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:45,612 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 12:53:45,612 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1149875535] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:45,612 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:45,612 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-02 12:53:45,612 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [177048975] [2021-05-02 12:53:45,613 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 12:53:45,613 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:45,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 12:53:45,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-05-02 12:53:45,613 INFO L87 Difference]: Start difference. First operand 88 states and 113 transitions. Second operand has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 14 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:46,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:46,116 INFO L93 Difference]: Finished difference Result 111 states and 136 transitions. [2021-05-02 12:53:46,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 12:53:46,117 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 14 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2021-05-02 12:53:46,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:46,117 INFO L225 Difference]: With dead ends: 111 [2021-05-02 12:53:46,117 INFO L226 Difference]: Without dead ends: 98 [2021-05-02 12:53:46,118 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 440.0ms TimeCoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:53:46,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-02 12:53:46,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 89. [2021-05-02 12:53:46,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 84 states have (on average 1.3095238095238095) internal successors, (110), 84 states have internal predecessors, (110), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:46,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 114 transitions. [2021-05-02 12:53:46,125 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 114 transitions. Word has length 30 [2021-05-02 12:53:46,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:46,125 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 114 transitions. [2021-05-02 12:53:46,125 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 14 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:46,126 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 114 transitions. [2021-05-02 12:53:46,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 12:53:46,126 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:46,126 INFO L523 BasicCegarLoop]: trace histogram [13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:46,328 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2021-05-02 12:53:46,329 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:46,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:46,329 INFO L82 PathProgramCache]: Analyzing trace with hash 1426165966, now seen corresponding path program 29 times [2021-05-02 12:53:46,329 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:46,329 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2092290778] [2021-05-02 12:53:46,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:46,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:46,579 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:46,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:46,589 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:53:46,589 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:46,589 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2092290778] [2021-05-02 12:53:46,589 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2092290778] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:46,589 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [149252493] [2021-05-02 12:53:46,589 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:47,068 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-05-02 12:53:47,069 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:47,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 36 conjunts are in the unsatisfiable core [2021-05-02 12:53:47,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:47,157 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:53:47,157 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [149252493] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:47,157 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:47,157 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 21 [2021-05-02 12:53:47,157 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800922783] [2021-05-02 12:53:47,157 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 12:53:47,157 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:47,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 12:53:47,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=375, Unknown=0, NotChecked=0, Total=420 [2021-05-02 12:53:47,158 INFO L87 Difference]: Start difference. First operand 89 states and 114 transitions. Second operand has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 20 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:48,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:48,069 INFO L93 Difference]: Finished difference Result 139 states and 194 transitions. [2021-05-02 12:53:48,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 12:53:48,069 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 20 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2021-05-02 12:53:48,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:48,070 INFO L225 Difference]: With dead ends: 139 [2021-05-02 12:53:48,070 INFO L226 Difference]: Without dead ends: 131 [2021-05-02 12:53:48,071 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 658.4ms TimeCoverageRelationStatistics Valid=122, Invalid=1284, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 12:53:48,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-05-02 12:53:48,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 95. [2021-05-02 12:53:48,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 90 states have (on average 1.3111111111111111) internal successors, (118), 90 states have internal predecessors, (118), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:48,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 122 transitions. [2021-05-02 12:53:48,080 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 122 transitions. Word has length 30 [2021-05-02 12:53:48,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:48,080 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 122 transitions. [2021-05-02 12:53:48,081 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 20 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:48,081 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 122 transitions. [2021-05-02 12:53:48,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 12:53:48,081 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:48,081 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:48,284 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,36 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:48,285 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:48,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:48,285 INFO L82 PathProgramCache]: Analyzing trace with hash -2100427281, now seen corresponding path program 30 times [2021-05-02 12:53:48,285 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:48,285 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60158374] [2021-05-02 12:53:48,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:48,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:48,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:48,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:48,448 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-05-02 12:53:48,448 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:48,448 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60158374] [2021-05-02 12:53:48,449 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [60158374] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:48,449 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1156104720] [2021-05-02 12:53:48,449 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:48,504 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-02 12:53:48,504 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:48,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 12:53:48,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:48,683 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-05-02 12:53:48,683 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1156104720] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:48,683 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:48,683 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 22 [2021-05-02 12:53:48,683 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316159857] [2021-05-02 12:53:48,684 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 12:53:48,684 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:48,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 12:53:48,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=399, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:53:48,684 INFO L87 Difference]: Start difference. First operand 95 states and 122 transitions. Second operand has 22 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 21 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 12:53:49,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:49,241 INFO L93 Difference]: Finished difference Result 116 states and 143 transitions. [2021-05-02 12:53:49,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 12:53:49,242 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 21 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-02 12:53:49,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:49,242 INFO L225 Difference]: With dead ends: 116 [2021-05-02 12:53:49,242 INFO L226 Difference]: Without dead ends: 104 [2021-05-02 12:53:49,243 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 566.4ms TimeCoverageRelationStatistics Valid=138, Invalid=1052, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 12:53:49,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-05-02 12:53:49,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 96. [2021-05-02 12:53:49,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 91 states have (on average 1.3076923076923077) internal successors, (119), 91 states have internal predecessors, (119), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:49,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 123 transitions. [2021-05-02 12:53:49,251 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 123 transitions. Word has length 31 [2021-05-02 12:53:49,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:49,251 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 123 transitions. [2021-05-02 12:53:49,251 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 21 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 12:53:49,251 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 123 transitions. [2021-05-02 12:53:49,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 12:53:49,252 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:49,252 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:49,464 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-05-02 12:53:49,465 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:49,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:49,465 INFO L82 PathProgramCache]: Analyzing trace with hash 868091775, now seen corresponding path program 31 times [2021-05-02 12:53:49,465 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:49,465 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [723341494] [2021-05-02 12:53:49,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:49,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:49,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:49,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:49,635 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 12:53:49,636 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:49,636 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [723341494] [2021-05-02 12:53:49,636 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [723341494] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:49,636 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1343152057] [2021-05-02 12:53:49,636 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:49,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:49,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 12:53:49,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:49,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:49,754 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 12:53:49,754 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1343152057] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:49,754 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:49,754 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 12:53:49,755 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858855474] [2021-05-02 12:53:49,755 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 12:53:49,755 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:49,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 12:53:49,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=207, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:53:49,755 INFO L87 Difference]: Start difference. First operand 96 states and 123 transitions. Second operand has 16 states, 16 states have (on average 1.5) internal successors, (24), 15 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 12:53:50,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:50,343 INFO L93 Difference]: Finished difference Result 119 states and 146 transitions. [2021-05-02 12:53:50,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 12:53:50,343 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 15 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 31 [2021-05-02 12:53:50,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:50,344 INFO L225 Difference]: With dead ends: 119 [2021-05-02 12:53:50,344 INFO L226 Difference]: Without dead ends: 106 [2021-05-02 12:53:50,344 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 526.5ms TimeCoverageRelationStatistics Valid=114, Invalid=816, Unknown=0, NotChecked=0, Total=930 [2021-05-02 12:53:50,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-05-02 12:53:50,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 97. [2021-05-02 12:53:50,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 92 states have (on average 1.3043478260869565) internal successors, (120), 92 states have internal predecessors, (120), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:50,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 124 transitions. [2021-05-02 12:53:50,352 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 124 transitions. Word has length 31 [2021-05-02 12:53:50,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:50,352 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 124 transitions. [2021-05-02 12:53:50,352 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 15 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 12:53:50,352 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 124 transitions. [2021-05-02 12:53:50,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 12:53:50,352 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:50,352 INFO L523 BasicCegarLoop]: trace histogram [14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:50,552 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-05-02 12:53:50,553 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:50,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:50,553 INFO L82 PathProgramCache]: Analyzing trace with hash 717920815, now seen corresponding path program 32 times [2021-05-02 12:53:50,553 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:50,553 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [354257196] [2021-05-02 12:53:50,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:50,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:50,796 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:50,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:50,812 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 0 proven. 106 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:53:50,812 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:50,812 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [354257196] [2021-05-02 12:53:50,812 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [354257196] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:50,812 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1945586164] [2021-05-02 12:53:50,812 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:50,853 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:53:50,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:50,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 12:53:50,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:50,909 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:50,917 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 0 proven. 106 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:53:50,917 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1945586164] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:50,917 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:50,917 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-02 12:53:50,917 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916689068] [2021-05-02 12:53:50,918 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 12:53:50,918 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:50,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 12:53:50,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=379, Unknown=0, NotChecked=0, Total=420 [2021-05-02 12:53:50,918 INFO L87 Difference]: Start difference. First operand 97 states and 124 transitions. Second operand has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 20 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:51,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:51,900 INFO L93 Difference]: Finished difference Result 148 states and 206 transitions. [2021-05-02 12:53:51,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 12:53:51,900 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 20 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-02 12:53:51,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:51,901 INFO L225 Difference]: With dead ends: 148 [2021-05-02 12:53:51,901 INFO L226 Difference]: Without dead ends: 140 [2021-05-02 12:53:51,902 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 687.1ms TimeCoverageRelationStatistics Valid=122, Invalid=1360, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 12:53:51,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-05-02 12:53:51,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 103. [2021-05-02 12:53:51,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.3061224489795917) internal successors, (128), 98 states have internal predecessors, (128), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:51,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 132 transitions. [2021-05-02 12:53:51,912 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 132 transitions. Word has length 31 [2021-05-02 12:53:51,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:51,912 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 132 transitions. [2021-05-02 12:53:51,912 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 20 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:51,912 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 132 transitions. [2021-05-02 12:53:51,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 12:53:51,913 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:51,913 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:52,128 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-05-02 12:53:52,129 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:52,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:52,129 INFO L82 PathProgramCache]: Analyzing trace with hash 1375844749, now seen corresponding path program 33 times [2021-05-02 12:53:52,129 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:52,129 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687528072] [2021-05-02 12:53:52,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:52,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:52,293 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:52,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:52,297 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-05-02 12:53:52,297 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:52,297 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1687528072] [2021-05-02 12:53:52,297 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1687528072] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:52,297 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [302800517] [2021-05-02 12:53:52,297 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:52,443 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 12:53:52,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:52,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-02 12:53:52,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:52,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:52,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:52,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:52,526 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-05-02 12:53:52,527 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [302800517] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:52,527 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:52,527 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 14 [2021-05-02 12:53:52,527 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823056171] [2021-05-02 12:53:52,527 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 12:53:52,527 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:52,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 12:53:52,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:53:52,528 INFO L87 Difference]: Start difference. First operand 103 states and 132 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 11 states have internal predecessors, (26), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:52,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:52,991 INFO L93 Difference]: Finished difference Result 242 states and 316 transitions. [2021-05-02 12:53:52,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 12:53:52,991 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 11 states have internal predecessors, (26), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 12:53:52,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:52,992 INFO L225 Difference]: With dead ends: 242 [2021-05-02 12:53:52,992 INFO L226 Difference]: Without dead ends: 230 [2021-05-02 12:53:52,992 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 358.9ms TimeCoverageRelationStatistics Valid=68, Invalid=438, Unknown=0, NotChecked=0, Total=506 [2021-05-02 12:53:52,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2021-05-02 12:53:53,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 107. [2021-05-02 12:53:53,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 102 states have (on average 1.3137254901960784) internal successors, (134), 102 states have internal predecessors, (134), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:53,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 138 transitions. [2021-05-02 12:53:53,005 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 138 transitions. Word has length 32 [2021-05-02 12:53:53,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:53,005 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 138 transitions. [2021-05-02 12:53:53,005 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 11 states have internal predecessors, (26), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:53,005 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 138 transitions. [2021-05-02 12:53:53,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 12:53:53,006 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:53,006 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:53,220 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-05-02 12:53:53,221 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:53,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:53,221 INFO L82 PathProgramCache]: Analyzing trace with hash -316309121, now seen corresponding path program 34 times [2021-05-02 12:53:53,221 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:53,221 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2088380985] [2021-05-02 12:53:53,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:53,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:53,414 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:53,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:53,417 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 12:53:53,418 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:53,418 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2088380985] [2021-05-02 12:53:53,418 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2088380985] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:53,418 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [487648408] [2021-05-02 12:53:53,418 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:53,462 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:53:53,462 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:53,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 12:53:53,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:53,516 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:53:53,531 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 12:53:53,531 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [487648408] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:53,531 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:53,531 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 12:53:53,531 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1008114372] [2021-05-02 12:53:53,531 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 12:53:53,531 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:53,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 12:53:53,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=236, Unknown=0, NotChecked=0, Total=272 [2021-05-02 12:53:53,532 INFO L87 Difference]: Start difference. First operand 107 states and 138 transitions. Second operand has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 16 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:54,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:54,228 INFO L93 Difference]: Finished difference Result 130 states and 161 transitions. [2021-05-02 12:53:54,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 12:53:54,229 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 16 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 12:53:54,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:54,229 INFO L225 Difference]: With dead ends: 130 [2021-05-02 12:53:54,229 INFO L226 Difference]: Without dead ends: 117 [2021-05-02 12:53:54,230 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 618.4ms TimeCoverageRelationStatistics Valid=131, Invalid=991, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 12:53:54,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-05-02 12:53:54,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 108. [2021-05-02 12:53:54,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 103 states have (on average 1.3106796116504855) internal successors, (135), 103 states have internal predecessors, (135), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:54,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 139 transitions. [2021-05-02 12:53:54,241 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 139 transitions. Word has length 32 [2021-05-02 12:53:54,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:54,242 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 139 transitions. [2021-05-02 12:53:54,242 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 16 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:54,242 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 139 transitions. [2021-05-02 12:53:54,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 12:53:54,242 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:54,242 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:54,460 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:54,460 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:54,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:54,461 INFO L82 PathProgramCache]: Analyzing trace with hash 1879174029, now seen corresponding path program 35 times [2021-05-02 12:53:54,461 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:54,461 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2088900266] [2021-05-02 12:53:54,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:54,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:54,633 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:54,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:54,638 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:53:54,638 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:54,638 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2088900266] [2021-05-02 12:53:54,639 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2088900266] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:54,639 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2092843731] [2021-05-02 12:53:54,639 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:55,002 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-02 12:53:55,002 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:55,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 12:53:55,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:55,100 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:53:55,100 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2092843731] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:55,100 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:55,100 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 18 [2021-05-02 12:53:55,100 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119770836] [2021-05-02 12:53:55,101 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 12:53:55,101 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:55,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 12:53:55,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:53:55,101 INFO L87 Difference]: Start difference. First operand 108 states and 139 transitions. Second operand has 18 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 17 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:55,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:55,713 INFO L93 Difference]: Finished difference Result 133 states and 164 transitions. [2021-05-02 12:53:55,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 12:53:55,713 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 17 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 12:53:55,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:55,714 INFO L225 Difference]: With dead ends: 133 [2021-05-02 12:53:55,714 INFO L226 Difference]: Without dead ends: 119 [2021-05-02 12:53:55,715 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 544.8ms TimeCoverageRelationStatistics Valid=122, Invalid=934, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 12:53:55,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-05-02 12:53:55,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 109. [2021-05-02 12:53:55,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.3076923076923077) internal successors, (136), 104 states have internal predecessors, (136), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:55,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 140 transitions. [2021-05-02 12:53:55,726 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 140 transitions. Word has length 32 [2021-05-02 12:53:55,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:55,726 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 140 transitions. [2021-05-02 12:53:55,726 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 17 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:55,726 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 140 transitions. [2021-05-02 12:53:55,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 12:53:55,727 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:55,727 INFO L523 BasicCegarLoop]: trace histogram [15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:55,930 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-05-02 12:53:55,930 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:55,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:55,931 INFO L82 PathProgramCache]: Analyzing trace with hash 237157614, now seen corresponding path program 36 times [2021-05-02 12:53:55,931 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:55,931 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [134621008] [2021-05-02 12:53:55,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:55,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:56,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:56,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:56,204 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:53:56,204 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:56,204 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [134621008] [2021-05-02 12:53:56,204 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [134621008] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:56,204 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [343827998] [2021-05-02 12:53:56,204 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:56,250 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-02 12:53:56,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:53:56,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 12:53:56,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:56,374 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 12:53:56,375 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [343827998] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:56,375 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:56,375 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 6] total 25 [2021-05-02 12:53:56,375 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596338481] [2021-05-02 12:53:56,375 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 12:53:56,375 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:56,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 12:53:56,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=550, Unknown=0, NotChecked=0, Total=600 [2021-05-02 12:53:56,376 INFO L87 Difference]: Start difference. First operand 109 states and 140 transitions. Second operand has 25 states, 25 states have (on average 1.44) internal successors, (36), 24 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:58,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:58,583 INFO L93 Difference]: Finished difference Result 170 states and 239 transitions. [2021-05-02 12:53:58,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 12:53:58,583 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.44) internal successors, (36), 24 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 12:53:58,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:58,584 INFO L225 Difference]: With dead ends: 170 [2021-05-02 12:53:58,584 INFO L226 Difference]: Without dead ends: 160 [2021-05-02 12:53:58,585 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 804 ImplicationChecksByTransitivity, 1685.4ms TimeCoverageRelationStatistics Valid=286, Invalid=4004, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 12:53:58,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-05-02 12:53:58,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 114. [2021-05-02 12:53:58,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 109 states have (on average 1.3027522935779816) internal successors, (142), 109 states have internal predecessors, (142), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:58,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 146 transitions. [2021-05-02 12:53:58,594 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 146 transitions. Word has length 32 [2021-05-02 12:53:58,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:58,594 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 146 transitions. [2021-05-02 12:53:58,594 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.44) internal successors, (36), 24 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:58,594 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 146 transitions. [2021-05-02 12:53:58,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 12:53:58,594 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:58,594 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:53:58,794 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,43 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:58,795 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:53:58,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:53:58,795 INFO L82 PathProgramCache]: Analyzing trace with hash 1766095279, now seen corresponding path program 37 times [2021-05-02 12:53:58,795 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:53:58,795 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [400063205] [2021-05-02 12:53:58,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:53:58,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:58,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:53:58,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:58,994 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-05-02 12:53:58,994 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:53:58,994 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [400063205] [2021-05-02 12:53:58,994 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [400063205] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:58,994 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1033681881] [2021-05-02 12:53:58,994 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:53:59,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:53:59,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 12:53:59,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:53:59,253 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-05-02 12:53:59,254 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1033681881] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:53:59,254 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:53:59,254 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 24 [2021-05-02 12:53:59,254 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424984535] [2021-05-02 12:53:59,255 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 12:53:59,255 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:53:59,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 12:53:59,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=493, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:53:59,256 INFO L87 Difference]: Start difference. First operand 114 states and 146 transitions. Second operand has 24 states, 24 states have (on average 1.375) internal successors, (33), 23 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:59,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:53:59,830 INFO L93 Difference]: Finished difference Result 126 states and 157 transitions. [2021-05-02 12:53:59,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 12:53:59,831 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.375) internal successors, (33), 23 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-05-02 12:53:59,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:53:59,831 INFO L225 Difference]: With dead ends: 126 [2021-05-02 12:53:59,831 INFO L226 Difference]: Without dead ends: 105 [2021-05-02 12:53:59,832 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 689.4ms TimeCoverageRelationStatistics Valid=136, Invalid=1270, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 12:53:59,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-05-02 12:53:59,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2021-05-02 12:53:59,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 100 states have (on average 1.31) internal successors, (131), 100 states have internal predecessors, (131), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:59,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 135 transitions. [2021-05-02 12:53:59,839 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 135 transitions. Word has length 33 [2021-05-02 12:53:59,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:53:59,839 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 135 transitions. [2021-05-02 12:53:59,839 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.375) internal successors, (33), 23 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:53:59,840 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 135 transitions. [2021-05-02 12:53:59,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 12:53:59,840 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:53:59,840 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:00,049 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,44 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:00,050 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:00,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:00,050 INFO L82 PathProgramCache]: Analyzing trace with hash 1621968767, now seen corresponding path program 38 times [2021-05-02 12:54:00,050 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:00,050 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [825781439] [2021-05-02 12:54:00,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:00,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:00,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:00,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:00,245 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 43 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 12:54:00,245 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:00,245 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [825781439] [2021-05-02 12:54:00,245 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [825781439] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:00,245 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [10803398] [2021-05-02 12:54:00,245 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:00,286 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:54:00,286 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:54:00,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-02 12:54:00,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:00,447 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 43 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 12:54:00,447 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [10803398] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:00,447 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:00,447 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 23 [2021-05-02 12:54:00,447 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799066265] [2021-05-02 12:54:00,448 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 12:54:00,448 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:00,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 12:54:00,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=441, Unknown=0, NotChecked=0, Total=506 [2021-05-02 12:54:00,448 INFO L87 Difference]: Start difference. First operand 105 states and 135 transitions. Second operand has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 22 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:01,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:01,015 INFO L93 Difference]: Finished difference Result 128 states and 158 transitions. [2021-05-02 12:54:01,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 12:54:01,016 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 22 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-05-02 12:54:01,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:01,016 INFO L225 Difference]: With dead ends: 128 [2021-05-02 12:54:01,016 INFO L226 Difference]: Without dead ends: 115 [2021-05-02 12:54:01,017 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 185 ImplicationChecksByTransitivity, 617.5ms TimeCoverageRelationStatistics Valid=144, Invalid=1188, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 12:54:01,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-05-02 12:54:01,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 106. [2021-05-02 12:54:01,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 101 states have (on average 1.306930693069307) internal successors, (132), 101 states have internal predecessors, (132), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:01,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 136 transitions. [2021-05-02 12:54:01,027 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 136 transitions. Word has length 33 [2021-05-02 12:54:01,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:01,028 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 136 transitions. [2021-05-02 12:54:01,028 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 22 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:01,028 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 136 transitions. [2021-05-02 12:54:01,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 12:54:01,028 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:01,028 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:01,244 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-05-02 12:54:01,245 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:01,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:01,245 INFO L82 PathProgramCache]: Analyzing trace with hash -843221009, now seen corresponding path program 39 times [2021-05-02 12:54:01,245 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:01,245 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1090934480] [2021-05-02 12:54:01,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:01,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:01,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:01,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:01,452 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:54:01,452 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:01,452 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1090934480] [2021-05-02 12:54:01,452 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1090934480] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:01,452 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1877256621] [2021-05-02 12:54:01,452 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:01,627 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 12:54:01,628 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:54:01,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 12:54:01,630 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:01,716 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:01,731 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:54:01,732 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1877256621] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:01,732 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:01,732 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 12:54:01,732 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112974575] [2021-05-02 12:54:01,732 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 12:54:01,732 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:01,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 12:54:01,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=237, Unknown=0, NotChecked=0, Total=272 [2021-05-02 12:54:01,733 INFO L87 Difference]: Start difference. First operand 106 states and 136 transitions. Second operand has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 16 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:02,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:02,456 INFO L93 Difference]: Finished difference Result 131 states and 161 transitions. [2021-05-02 12:54:02,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 12:54:02,457 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 16 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-05-02 12:54:02,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:02,472 INFO L225 Difference]: With dead ends: 131 [2021-05-02 12:54:02,473 INFO L226 Difference]: Without dead ends: 117 [2021-05-02 12:54:02,473 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 31 SyntacticMatches, 3 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 688.4ms TimeCoverageRelationStatistics Valid=120, Invalid=936, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 12:54:02,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-05-02 12:54:02,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 107. [2021-05-02 12:54:02,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 102 states have (on average 1.303921568627451) internal successors, (133), 102 states have internal predecessors, (133), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:02,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 137 transitions. [2021-05-02 12:54:02,485 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 137 transitions. Word has length 33 [2021-05-02 12:54:02,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:02,485 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 137 transitions. [2021-05-02 12:54:02,485 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 16 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:02,485 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 137 transitions. [2021-05-02 12:54:02,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 12:54:02,485 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:02,485 INFO L523 BasicCegarLoop]: trace histogram [16, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:02,688 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,46 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:02,688 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:02,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:02,688 INFO L82 PathProgramCache]: Analyzing trace with hash -1243592320, now seen corresponding path program 40 times [2021-05-02 12:54:02,688 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:02,689 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [86127043] [2021-05-02 12:54:02,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:02,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:02,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:02,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:03,004 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 139 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:54:03,004 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:03,004 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [86127043] [2021-05-02 12:54:03,004 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [86127043] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:03,004 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1996903397] [2021-05-02 12:54:03,004 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:03,071 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:54:03,071 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:54:03,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 12:54:03,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:03,138 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:03,145 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 139 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:54:03,145 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1996903397] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:03,145 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:03,145 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-02 12:54:03,146 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027455569] [2021-05-02 12:54:03,146 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 12:54:03,146 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:03,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 12:54:03,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=504, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:54:03,146 INFO L87 Difference]: Start difference. First operand 107 states and 137 transitions. Second operand has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 23 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:04,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:04,511 INFO L93 Difference]: Finished difference Result 166 states and 234 transitions. [2021-05-02 12:54:04,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 12:54:04,511 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 23 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-05-02 12:54:04,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:04,512 INFO L225 Difference]: With dead ends: 166 [2021-05-02 12:54:04,512 INFO L226 Difference]: Without dead ends: 157 [2021-05-02 12:54:04,513 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 266 ImplicationChecksByTransitivity, 922.2ms TimeCoverageRelationStatistics Valid=158, Invalid=2004, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 12:54:04,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-05-02 12:54:04,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 114. [2021-05-02 12:54:04,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 109 states have (on average 1.3027522935779816) internal successors, (142), 109 states have internal predecessors, (142), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:04,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 146 transitions. [2021-05-02 12:54:04,522 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 146 transitions. Word has length 33 [2021-05-02 12:54:04,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:04,522 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 146 transitions. [2021-05-02 12:54:04,522 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 23 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:04,522 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 146 transitions. [2021-05-02 12:54:04,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 12:54:04,523 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:04,523 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:04,732 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-05-02 12:54:04,733 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:04,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:04,733 INFO L82 PathProgramCache]: Analyzing trace with hash 1579041151, now seen corresponding path program 41 times [2021-05-02 12:54:04,733 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:04,733 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534162946] [2021-05-02 12:54:04,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:04,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:04,939 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:04,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:04,942 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 12:54:04,942 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:04,942 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534162946] [2021-05-02 12:54:04,942 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [534162946] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:04,942 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1247735991] [2021-05-02 12:54:04,942 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:05,391 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-02 12:54:05,391 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:54:05,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 44 conjunts are in the unsatisfiable core [2021-05-02 12:54:05,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:05,596 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 12:54:05,596 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1247735991] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:05,596 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:05,596 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 25 [2021-05-02 12:54:05,596 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090823099] [2021-05-02 12:54:05,596 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 12:54:05,596 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:05,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 12:54:05,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=527, Unknown=0, NotChecked=0, Total=600 [2021-05-02 12:54:05,597 INFO L87 Difference]: Start difference. First operand 114 states and 146 transitions. Second operand has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:06,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:06,301 INFO L93 Difference]: Finished difference Result 137 states and 169 transitions. [2021-05-02 12:54:06,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 12:54:06,302 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-05-02 12:54:06,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:06,303 INFO L225 Difference]: With dead ends: 137 [2021-05-02 12:54:06,303 INFO L226 Difference]: Without dead ends: 124 [2021-05-02 12:54:06,303 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 225 ImplicationChecksByTransitivity, 674.7ms TimeCoverageRelationStatistics Valid=160, Invalid=1400, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 12:54:06,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-05-02 12:54:06,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 115. [2021-05-02 12:54:06,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.3) internal successors, (143), 110 states have internal predecessors, (143), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:06,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 147 transitions. [2021-05-02 12:54:06,313 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 147 transitions. Word has length 34 [2021-05-02 12:54:06,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:06,313 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 147 transitions. [2021-05-02 12:54:06,313 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:06,313 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 147 transitions. [2021-05-02 12:54:06,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 12:54:06,314 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:06,314 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:06,518 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:06,519 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:06,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:06,519 INFO L82 PathProgramCache]: Analyzing trace with hash 661878733, now seen corresponding path program 42 times [2021-05-02 12:54:06,519 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:06,519 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1393218614] [2021-05-02 12:54:06,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:06,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:06,735 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:06,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:06,739 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:54:06,739 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:06,739 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1393218614] [2021-05-02 12:54:06,739 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1393218614] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:06,739 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1755724695] [2021-05-02 12:54:06,739 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:06,876 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-05-02 12:54:06,877 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:54:06,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 12:54:06,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:06,896 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:06,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:06,936 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:06,950 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:54:06,950 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1755724695] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:06,950 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:06,950 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 12:54:06,950 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [209143719] [2021-05-02 12:54:06,950 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 12:54:06,951 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:06,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 12:54:06,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=268, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:54:06,952 INFO L87 Difference]: Start difference. First operand 115 states and 147 transitions. Second operand has 18 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 17 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:07,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:07,748 INFO L93 Difference]: Finished difference Result 140 states and 172 transitions. [2021-05-02 12:54:07,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 12:54:07,749 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 17 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-05-02 12:54:07,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:07,749 INFO L225 Difference]: With dead ends: 140 [2021-05-02 12:54:07,750 INFO L226 Difference]: Without dead ends: 126 [2021-05-02 12:54:07,750 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 702.6ms TimeCoverageRelationStatistics Valid=137, Invalid=1123, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 12:54:07,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-05-02 12:54:07,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 116. [2021-05-02 12:54:07,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 111 states have (on average 1.2972972972972974) internal successors, (144), 111 states have internal predecessors, (144), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:07,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 148 transitions. [2021-05-02 12:54:07,760 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 148 transitions. Word has length 34 [2021-05-02 12:54:07,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:07,760 INFO L480 AbstractCegarLoop]: Abstraction has 116 states and 148 transitions. [2021-05-02 12:54:07,760 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 17 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:07,760 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 148 transitions. [2021-05-02 12:54:07,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 12:54:07,760 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:07,760 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:07,961 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-05-02 12:54:07,961 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:07,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:07,961 INFO L82 PathProgramCache]: Analyzing trace with hash 2379647, now seen corresponding path program 43 times [2021-05-02 12:54:07,961 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:07,961 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1858292982] [2021-05-02 12:54:07,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:07,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:08,146 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:08,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:08,149 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 12:54:08,149 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:08,149 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1858292982] [2021-05-02 12:54:08,150 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1858292982] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:08,150 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [189103659] [2021-05-02 12:54:08,150 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:08,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:08,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 12:54:08,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:08,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:08,280 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 12:54:08,280 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [189103659] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:08,280 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:08,280 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 12:54:08,281 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355416157] [2021-05-02 12:54:08,281 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 12:54:08,281 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:08,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 12:54:08,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=238, Unknown=0, NotChecked=0, Total=272 [2021-05-02 12:54:08,281 INFO L87 Difference]: Start difference. First operand 116 states and 148 transitions. Second operand has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 16 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:08,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:08,950 INFO L93 Difference]: Finished difference Result 143 states and 175 transitions. [2021-05-02 12:54:08,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 12:54:08,951 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 16 states have internal predecessors, (25), 2 states have call successors, (4), 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 34 [2021-05-02 12:54:08,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:08,951 INFO L225 Difference]: With dead ends: 143 [2021-05-02 12:54:08,951 INFO L226 Difference]: Without dead ends: 128 [2021-05-02 12:54:08,952 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 581.8ms TimeCoverageRelationStatistics Valid=116, Invalid=940, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 12:54:08,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-05-02 12:54:08,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 117. [2021-05-02 12:54:08,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 112 states have (on average 1.2946428571428572) internal successors, (145), 112 states have internal predecessors, (145), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:08,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 149 transitions. [2021-05-02 12:54:08,962 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 149 transitions. Word has length 34 [2021-05-02 12:54:08,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:08,963 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 149 transitions. [2021-05-02 12:54:08,963 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 16 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:08,963 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 149 transitions. [2021-05-02 12:54:08,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 12:54:08,963 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:08,963 INFO L523 BasicCegarLoop]: trace histogram [17, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:09,163 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-05-02 12:54:09,164 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:09,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:09,164 INFO L82 PathProgramCache]: Analyzing trace with hash 599439487, now seen corresponding path program 44 times [2021-05-02 12:54:09,164 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:09,164 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1964338644] [2021-05-02 12:54:09,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:09,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:09,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:09,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:09,517 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:54:09,517 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:09,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1964338644] [2021-05-02 12:54:09,517 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1964338644] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:09,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [284464842] [2021-05-02 12:54:09,517 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:09,560 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:54:09,561 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:54:09,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 12:54:09,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:09,652 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:09,661 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:54:09,662 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [284464842] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:09,662 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:09,662 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 12:54:09,663 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069123711] [2021-05-02 12:54:09,663 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 12:54:09,663 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:09,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 12:54:09,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=550, Unknown=0, NotChecked=0, Total=600 [2021-05-02 12:54:09,664 INFO L87 Difference]: Start difference. First operand 117 states and 149 transitions. Second operand has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:11,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:11,139 INFO L93 Difference]: Finished difference Result 177 states and 248 transitions. [2021-05-02 12:54:11,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 12:54:11,140 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-05-02 12:54:11,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:11,141 INFO L225 Difference]: With dead ends: 177 [2021-05-02 12:54:11,141 INFO L226 Difference]: Without dead ends: 168 [2021-05-02 12:54:11,141 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 1006.8ms TimeCoverageRelationStatistics Valid=164, Invalid=2188, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 12:54:11,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-05-02 12:54:11,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 124. [2021-05-02 12:54:11,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 119 states have (on average 1.2941176470588236) internal successors, (154), 119 states have internal predecessors, (154), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:11,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 158 transitions. [2021-05-02 12:54:11,150 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 158 transitions. Word has length 34 [2021-05-02 12:54:11,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:11,150 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 158 transitions. [2021-05-02 12:54:11,150 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:11,150 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 158 transitions. [2021-05-02 12:54:11,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 12:54:11,150 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:11,150 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:11,371 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-05-02 12:54:11,371 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:11,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:11,371 INFO L82 PathProgramCache]: Analyzing trace with hash 248285055, now seen corresponding path program 45 times [2021-05-02 12:54:11,371 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:11,371 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1386459502] [2021-05-02 12:54:11,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:11,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:11,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:11,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:11,553 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 12:54:11,553 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:11,553 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1386459502] [2021-05-02 12:54:11,553 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1386459502] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:11,553 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [464041316] [2021-05-02 12:54:11,553 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:11,892 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 12:54:11,892 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:54:11,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 12:54:11,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:11,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:11,944 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:11,946 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:11,978 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 12:54:11,978 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [464041316] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:11,978 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:11,978 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 15 [2021-05-02 12:54:11,978 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [402859214] [2021-05-02 12:54:11,978 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 12:54:11,979 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:11,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 12:54:11,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2021-05-02 12:54:11,979 INFO L87 Difference]: Start difference. First operand 124 states and 158 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 12 states have internal predecessors, (28), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:12,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:12,459 INFO L93 Difference]: Finished difference Result 310 states and 406 transitions. [2021-05-02 12:54:12,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 12:54:12,460 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 12 states have internal predecessors, (28), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-02 12:54:12,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:12,461 INFO L225 Difference]: With dead ends: 310 [2021-05-02 12:54:12,461 INFO L226 Difference]: Without dead ends: 297 [2021-05-02 12:54:12,462 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 377.4ms TimeCoverageRelationStatistics Valid=74, Invalid=526, Unknown=0, NotChecked=0, Total=600 [2021-05-02 12:54:12,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2021-05-02 12:54:12,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 128. [2021-05-02 12:54:12,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 123 states have (on average 1.3008130081300813) internal successors, (160), 123 states have internal predecessors, (160), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:12,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 164 transitions. [2021-05-02 12:54:12,476 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 164 transitions. Word has length 35 [2021-05-02 12:54:12,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:12,476 INFO L480 AbstractCegarLoop]: Abstraction has 128 states and 164 transitions. [2021-05-02 12:54:12,476 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 12 states have internal predecessors, (28), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:12,476 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 164 transitions. [2021-05-02 12:54:12,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 12:54:12,476 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:12,476 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:12,680 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-05-02 12:54:12,681 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:12,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:12,681 INFO L82 PathProgramCache]: Analyzing trace with hash 75330479, now seen corresponding path program 46 times [2021-05-02 12:54:12,681 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:12,681 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1226900207] [2021-05-02 12:54:12,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:12,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:12,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:12,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:12,897 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:54:12,898 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:12,898 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1226900207] [2021-05-02 12:54:12,898 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1226900207] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:12,898 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1284502509] [2021-05-02 12:54:12,898 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:12,955 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:54:12,955 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:54:12,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 12:54:12,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:13,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:13,033 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:54:13,033 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1284502509] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:13,034 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:13,034 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 12:54:13,034 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852757442] [2021-05-02 12:54:13,034 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 12:54:13,034 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:13,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 12:54:13,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=301, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:54:13,035 INFO L87 Difference]: Start difference. First operand 128 states and 164 transitions. Second operand has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:13,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:13,843 INFO L93 Difference]: Finished difference Result 153 states and 189 transitions. [2021-05-02 12:54:13,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 12:54:13,844 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-02 12:54:13,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:13,844 INFO L225 Difference]: With dead ends: 153 [2021-05-02 12:54:13,844 INFO L226 Difference]: Without dead ends: 139 [2021-05-02 12:54:13,845 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 722.1ms TimeCoverageRelationStatistics Valid=154, Invalid=1328, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 12:54:13,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-05-02 12:54:13,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 129. [2021-05-02 12:54:13,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 124 states have (on average 1.2983870967741935) internal successors, (161), 124 states have internal predecessors, (161), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:13,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 165 transitions. [2021-05-02 12:54:13,855 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 165 transitions. Word has length 35 [2021-05-02 12:54:13,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:13,855 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 165 transitions. [2021-05-02 12:54:13,855 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:13,855 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 165 transitions. [2021-05-02 12:54:13,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 12:54:13,855 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:13,855 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:14,055 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,53 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:14,056 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:14,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:14,056 INFO L82 PathProgramCache]: Analyzing trace with hash 963858751, now seen corresponding path program 47 times [2021-05-02 12:54:14,056 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:14,056 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1056372013] [2021-05-02 12:54:14,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:14,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:14,232 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:14,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:14,235 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 12:54:14,235 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:14,235 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1056372013] [2021-05-02 12:54:14,235 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1056372013] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:14,235 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [385908739] [2021-05-02 12:54:14,235 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:14,645 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 12:54:14,645 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:54:14,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 51 conjunts are in the unsatisfiable core [2021-05-02 12:54:14,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:14,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:14,674 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:14,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:14,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:14,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:14,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:14,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:14,687 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:14,837 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 12:54:14,837 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [385908739] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:14,837 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:14,837 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 21 [2021-05-02 12:54:14,837 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681899730] [2021-05-02 12:54:14,838 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 12:54:14,838 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:14,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 12:54:14,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=367, Unknown=0, NotChecked=0, Total=420 [2021-05-02 12:54:14,839 INFO L87 Difference]: Start difference. First operand 129 states and 165 transitions. Second operand has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 20 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:15,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:15,658 INFO L93 Difference]: Finished difference Result 156 states and 192 transitions. [2021-05-02 12:54:15,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 12:54:15,659 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 20 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-02 12:54:15,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:15,659 INFO L225 Difference]: With dead ends: 156 [2021-05-02 12:54:15,659 INFO L226 Difference]: Without dead ends: 141 [2021-05-02 12:54:15,660 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 762.8ms TimeCoverageRelationStatistics Valid=160, Invalid=1400, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 12:54:15,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-02 12:54:15,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 130. [2021-05-02 12:54:15,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 125 states have (on average 1.296) internal successors, (162), 125 states have internal predecessors, (162), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:15,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 166 transitions. [2021-05-02 12:54:15,673 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 166 transitions. Word has length 35 [2021-05-02 12:54:15,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:15,673 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 166 transitions. [2021-05-02 12:54:15,673 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 20 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:15,673 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 166 transitions. [2021-05-02 12:54:15,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 12:54:15,673 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:15,673 INFO L523 BasicCegarLoop]: trace histogram [18, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:15,874 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable62 [2021-05-02 12:54:15,875 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:15,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:15,875 INFO L82 PathProgramCache]: Analyzing trace with hash 1898850656, now seen corresponding path program 48 times [2021-05-02 12:54:15,875 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:15,875 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2065525628] [2021-05-02 12:54:15,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:15,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:16,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:16,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:16,228 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 0 proven. 174 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:54:16,228 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:16,228 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2065525628] [2021-05-02 12:54:16,228 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2065525628] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:16,228 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1925918022] [2021-05-02 12:54:16,228 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:16,279 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-02 12:54:16,279 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:54:16,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 12:54:16,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:16,415 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2021-05-02 12:54:16,416 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1925918022] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:16,416 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:16,416 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 6] total 29 [2021-05-02 12:54:16,416 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180914952] [2021-05-02 12:54:16,416 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 12:54:16,416 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:16,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 12:54:16,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=719, Unknown=0, NotChecked=0, Total=812 [2021-05-02 12:54:16,417 INFO L87 Difference]: Start difference. First operand 130 states and 166 transitions. Second operand has 29 states, 29 states have (on average 1.4137931034482758) internal successors, (41), 28 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:19,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:19,323 INFO L93 Difference]: Finished difference Result 214 states and 305 transitions. [2021-05-02 12:54:19,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 12:54:19,323 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.4137931034482758) internal successors, (41), 28 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-02 12:54:19,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:19,324 INFO L225 Difference]: With dead ends: 214 [2021-05-02 12:54:19,324 INFO L226 Difference]: Without dead ends: 205 [2021-05-02 12:54:19,324 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1375 ImplicationChecksByTransitivity, 2259.5ms TimeCoverageRelationStatistics Valid=656, Invalid=5824, Unknown=0, NotChecked=0, Total=6480 [2021-05-02 12:54:19,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2021-05-02 12:54:19,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 142. [2021-05-02 12:54:19,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 137 states have (on average 1.2773722627737227) internal successors, (175), 137 states have internal predecessors, (175), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:19,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 179 transitions. [2021-05-02 12:54:19,341 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 179 transitions. Word has length 35 [2021-05-02 12:54:19,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:19,342 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 179 transitions. [2021-05-02 12:54:19,342 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.4137931034482758) internal successors, (41), 28 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:19,342 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 179 transitions. [2021-05-02 12:54:19,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 12:54:19,342 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:19,342 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:19,548 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable63 [2021-05-02 12:54:19,549 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:19,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:19,549 INFO L82 PathProgramCache]: Analyzing trace with hash 1944519039, now seen corresponding path program 49 times [2021-05-02 12:54:19,549 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:19,549 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1267101431] [2021-05-02 12:54:19,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:19,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:19,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:19,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:19,777 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 12:54:19,777 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:19,777 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1267101431] [2021-05-02 12:54:19,778 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1267101431] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:19,778 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1957002399] [2021-05-02 12:54:19,778 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:19,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:19,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 48 conjunts are in the unsatisfiable core [2021-05-02 12:54:19,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:20,041 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 12:54:20,041 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1957002399] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:20,041 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:20,041 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 27 [2021-05-02 12:54:20,041 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444192817] [2021-05-02 12:54:20,041 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 12:54:20,041 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:20,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 12:54:20,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=635, Unknown=0, NotChecked=0, Total=702 [2021-05-02 12:54:20,042 INFO L87 Difference]: Start difference. First operand 142 states and 179 transitions. Second operand has 27 states, 27 states have (on average 1.3333333333333333) internal successors, (36), 26 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:20,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:20,669 INFO L93 Difference]: Finished difference Result 155 states and 191 transitions. [2021-05-02 12:54:20,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 12:54:20,669 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.3333333333333333) internal successors, (36), 26 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2021-05-02 12:54:20,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:20,670 INFO L225 Difference]: With dead ends: 155 [2021-05-02 12:54:20,670 INFO L226 Difference]: Without dead ends: 132 [2021-05-02 12:54:20,671 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 260 ImplicationChecksByTransitivity, 778.1ms TimeCoverageRelationStatistics Valid=155, Invalid=1651, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 12:54:20,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-05-02 12:54:20,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2021-05-02 12:54:20,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 127 states have (on average 1.2834645669291338) internal successors, (163), 127 states have internal predecessors, (163), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:20,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 167 transitions. [2021-05-02 12:54:20,682 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 167 transitions. Word has length 36 [2021-05-02 12:54:20,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:20,682 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 167 transitions. [2021-05-02 12:54:20,682 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 1.3333333333333333) internal successors, (36), 26 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:20,682 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 167 transitions. [2021-05-02 12:54:20,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 12:54:20,682 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:20,682 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:20,882 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,56 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:20,883 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:20,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:20,883 INFO L82 PathProgramCache]: Analyzing trace with hash -927796211, now seen corresponding path program 50 times [2021-05-02 12:54:20,883 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:20,883 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [682329578] [2021-05-02 12:54:20,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:20,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:21,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:21,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:21,122 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:54:21,122 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:21,122 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [682329578] [2021-05-02 12:54:21,122 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [682329578] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:21,122 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1952917761] [2021-05-02 12:54:21,122 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:21,169 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:54:21,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:54:21,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-02 12:54:21,171 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:21,425 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:54:21,426 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1952917761] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:21,426 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:21,426 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 26 [2021-05-02 12:54:21,426 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [26310667] [2021-05-02 12:54:21,426 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 12:54:21,426 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:21,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 12:54:21,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=575, Unknown=0, NotChecked=0, Total=650 [2021-05-02 12:54:21,427 INFO L87 Difference]: Start difference. First operand 132 states and 167 transitions. Second operand has 26 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 25 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 12:54:22,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:22,173 INFO L93 Difference]: Finished difference Result 157 states and 192 transitions. [2021-05-02 12:54:22,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 12:54:22,173 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 25 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 36 [2021-05-02 12:54:22,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:22,174 INFO L225 Difference]: With dead ends: 157 [2021-05-02 12:54:22,174 INFO L226 Difference]: Without dead ends: 143 [2021-05-02 12:54:22,174 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 247 ImplicationChecksByTransitivity, 830.2ms TimeCoverageRelationStatistics Valid=166, Invalid=1556, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 12:54:22,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-05-02 12:54:22,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 133. [2021-05-02 12:54:22,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.28125) internal successors, (164), 128 states have internal predecessors, (164), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:22,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 168 transitions. [2021-05-02 12:54:22,185 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 168 transitions. Word has length 36 [2021-05-02 12:54:22,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:22,185 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 168 transitions. [2021-05-02 12:54:22,186 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 25 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 12:54:22,186 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 168 transitions. [2021-05-02 12:54:22,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 12:54:22,186 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:22,186 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:22,396 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable65 [2021-05-02 12:54:22,397 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:22,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:22,397 INFO L82 PathProgramCache]: Analyzing trace with hash 704939903, now seen corresponding path program 51 times [2021-05-02 12:54:22,397 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:22,397 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [707282315] [2021-05-02 12:54:22,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:22,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:22,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:22,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:22,626 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 12:54:22,626 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:22,626 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [707282315] [2021-05-02 12:54:22,626 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [707282315] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:22,626 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2026313195] [2021-05-02 12:54:22,626 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:22,777 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-05-02 12:54:22,778 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:54:22,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 12:54:22,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:22,840 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:22,858 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 12:54:22,858 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2026313195] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:22,858 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:22,858 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 12:54:22,858 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523733121] [2021-05-02 12:54:22,859 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 12:54:22,859 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:22,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 12:54:22,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=302, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:54:22,859 INFO L87 Difference]: Start difference. First operand 133 states and 168 transitions. Second operand has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:23,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:23,769 INFO L93 Difference]: Finished difference Result 160 states and 195 transitions. [2021-05-02 12:54:23,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 12:54:23,770 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2021-05-02 12:54:23,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:23,771 INFO L225 Difference]: With dead ends: 160 [2021-05-02 12:54:23,771 INFO L226 Difference]: Without dead ends: 145 [2021-05-02 12:54:23,771 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 817.1ms TimeCoverageRelationStatistics Valid=143, Invalid=1263, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 12:54:23,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2021-05-02 12:54:23,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 134. [2021-05-02 12:54:23,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 129 states have (on average 1.2790697674418605) internal successors, (165), 129 states have internal predecessors, (165), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:23,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 169 transitions. [2021-05-02 12:54:23,781 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 169 transitions. Word has length 36 [2021-05-02 12:54:23,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:23,781 INFO L480 AbstractCegarLoop]: Abstraction has 134 states and 169 transitions. [2021-05-02 12:54:23,781 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:23,781 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 169 transitions. [2021-05-02 12:54:23,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 12:54:23,781 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:23,781 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:23,981 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66,58 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:23,982 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:23,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:23,982 INFO L82 PathProgramCache]: Analyzing trace with hash 1735304717, now seen corresponding path program 52 times [2021-05-02 12:54:23,982 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:23,982 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1955027984] [2021-05-02 12:54:23,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:23,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:24,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:24,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:24,168 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 12:54:24,168 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:24,168 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1955027984] [2021-05-02 12:54:24,168 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1955027984] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:24,169 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [910808509] [2021-05-02 12:54:24,169 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:24,209 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:54:24,210 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:54:24,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 12:54:24,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:24,275 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:24,291 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 12:54:24,291 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [910808509] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:24,291 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:24,292 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 12:54:24,292 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972931476] [2021-05-02 12:54:24,292 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 12:54:24,292 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:24,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 12:54:24,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=270, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:54:24,292 INFO L87 Difference]: Start difference. First operand 134 states and 169 transitions. Second operand has 18 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 17 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:24,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:24,963 INFO L93 Difference]: Finished difference Result 163 states and 198 transitions. [2021-05-02 12:54:24,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 12:54:24,964 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 17 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2021-05-02 12:54:24,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:24,964 INFO L225 Difference]: With dead ends: 163 [2021-05-02 12:54:24,964 INFO L226 Difference]: Without dead ends: 147 [2021-05-02 12:54:24,965 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 143 ImplicationChecksByTransitivity, 605.3ms TimeCoverageRelationStatistics Valid=122, Invalid=1068, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 12:54:24,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-05-02 12:54:24,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 135. [2021-05-02 12:54:24,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 130 states have (on average 1.2769230769230768) internal successors, (166), 130 states have internal predecessors, (166), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:24,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 170 transitions. [2021-05-02 12:54:24,975 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 170 transitions. Word has length 36 [2021-05-02 12:54:24,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:24,975 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 170 transitions. [2021-05-02 12:54:24,975 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 17 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:24,975 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 170 transitions. [2021-05-02 12:54:24,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 12:54:24,975 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:24,975 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:25,176 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2021-05-02 12:54:25,176 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:25,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:25,176 INFO L82 PathProgramCache]: Analyzing trace with hash -1959952529, now seen corresponding path program 53 times [2021-05-02 12:54:25,176 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:25,176 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [894170255] [2021-05-02 12:54:25,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:25,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:25,408 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:25,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:25,417 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:54:25,417 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:25,417 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [894170255] [2021-05-02 12:54:25,417 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [894170255] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:25,417 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1450794270] [2021-05-02 12:54:25,417 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:25,908 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-02 12:54:25,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:54:25,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 50 conjunts are in the unsatisfiable core [2021-05-02 12:54:25,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:26,131 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:54:26,131 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1450794270] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:26,131 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:26,131 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 28 [2021-05-02 12:54:26,131 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189344767] [2021-05-02 12:54:26,131 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 12:54:26,131 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:26,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 12:54:26,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=673, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:54:26,132 INFO L87 Difference]: Start difference. First operand 135 states and 170 transitions. Second operand has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 27 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:26,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:26,893 INFO L93 Difference]: Finished difference Result 160 states and 195 transitions. [2021-05-02 12:54:26,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 12:54:26,893 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 27 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2021-05-02 12:54:26,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:26,894 INFO L225 Difference]: With dead ends: 160 [2021-05-02 12:54:26,894 INFO L226 Difference]: Without dead ends: 146 [2021-05-02 12:54:26,894 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 293 ImplicationChecksByTransitivity, 820.7ms TimeCoverageRelationStatistics Valid=182, Invalid=1798, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 12:54:26,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-05-02 12:54:26,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 136. [2021-05-02 12:54:26,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 131 states have (on average 1.2748091603053435) internal successors, (167), 131 states have internal predecessors, (167), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:26,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 171 transitions. [2021-05-02 12:54:26,905 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 171 transitions. Word has length 37 [2021-05-02 12:54:26,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:26,905 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 171 transitions. [2021-05-02 12:54:26,905 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 27 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:26,905 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 171 transitions. [2021-05-02 12:54:26,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 12:54:26,905 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:26,905 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:27,106 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68,60 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:27,106 INFO L428 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:27,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:27,106 INFO L82 PathProgramCache]: Analyzing trace with hash 1268390207, now seen corresponding path program 54 times [2021-05-02 12:54:27,106 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:27,106 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [829827882] [2021-05-02 12:54:27,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:27,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:27,337 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:27,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:27,340 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 12:54:27,340 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:27,340 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [829827882] [2021-05-02 12:54:27,340 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [829827882] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:27,340 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1617851370] [2021-05-02 12:54:27,340 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:27,497 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-05-02 12:54:27,497 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:54:27,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 12:54:27,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:27,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:27,567 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 12:54:27,567 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1617851370] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:27,567 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:27,567 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 12:54:27,567 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585289370] [2021-05-02 12:54:27,568 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 12:54:27,568 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:27,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 12:54:27,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=337, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:54:27,568 INFO L87 Difference]: Start difference. First operand 136 states and 171 transitions. Second operand has 20 states, 20 states have (on average 1.4) internal successors, (28), 19 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:28,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:28,452 INFO L93 Difference]: Finished difference Result 163 states and 198 transitions. [2021-05-02 12:54:28,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 12:54:28,453 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.4) internal successors, (28), 19 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 37 [2021-05-02 12:54:28,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:28,453 INFO L225 Difference]: With dead ends: 163 [2021-05-02 12:54:28,453 INFO L226 Difference]: Without dead ends: 148 [2021-05-02 12:54:28,454 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 774.8ms TimeCoverageRelationStatistics Valid=160, Invalid=1480, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 12:54:28,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-05-02 12:54:28,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 137. [2021-05-02 12:54:28,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 132 states have (on average 1.2727272727272727) internal successors, (168), 132 states have internal predecessors, (168), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:28,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 172 transitions. [2021-05-02 12:54:28,467 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 172 transitions. Word has length 37 [2021-05-02 12:54:28,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:28,467 INFO L480 AbstractCegarLoop]: Abstraction has 137 states and 172 transitions. [2021-05-02 12:54:28,467 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 1.4) internal successors, (28), 19 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:28,467 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 172 transitions. [2021-05-02 12:54:28,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 12:54:28,468 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:28,468 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:28,669 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2021-05-02 12:54:28,669 INFO L428 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:28,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:28,670 INFO L82 PathProgramCache]: Analyzing trace with hash -1252004433, now seen corresponding path program 55 times [2021-05-02 12:54:28,670 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:28,670 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [834323062] [2021-05-02 12:54:28,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:28,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:28,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:28,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:28,900 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 12:54:28,900 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:28,900 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [834323062] [2021-05-02 12:54:28,900 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [834323062] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:28,901 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1174236493] [2021-05-02 12:54:28,901 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:28,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:28,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 12:54:28,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:29,010 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:29,025 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 12:54:29,026 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1174236493] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:29,026 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:29,026 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 12:54:29,026 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255959683] [2021-05-02 12:54:29,026 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 12:54:29,026 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:29,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 12:54:29,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=303, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:54:29,026 INFO L87 Difference]: Start difference. First operand 137 states and 172 transitions. Second operand has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:29,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:29,866 INFO L93 Difference]: Finished difference Result 166 states and 201 transitions. [2021-05-02 12:54:29,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 12:54:29,867 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2021-05-02 12:54:29,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:29,868 INFO L225 Difference]: With dead ends: 166 [2021-05-02 12:54:29,868 INFO L226 Difference]: Without dead ends: 150 [2021-05-02 12:54:29,868 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 730.7ms TimeCoverageRelationStatistics Valid=146, Invalid=1336, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 12:54:29,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-05-02 12:54:29,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 138. [2021-05-02 12:54:29,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 133 states have (on average 1.2706766917293233) internal successors, (169), 133 states have internal predecessors, (169), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:29,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 173 transitions. [2021-05-02 12:54:29,884 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 173 transitions. Word has length 37 [2021-05-02 12:54:29,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:29,884 INFO L480 AbstractCegarLoop]: Abstraction has 138 states and 173 transitions. [2021-05-02 12:54:29,884 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:29,884 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 173 transitions. [2021-05-02 12:54:29,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 12:54:29,885 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:29,885 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:30,100 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,62 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:30,101 INFO L428 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:30,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:30,101 INFO L82 PathProgramCache]: Analyzing trace with hash 402939981, now seen corresponding path program 56 times [2021-05-02 12:54:30,101 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:30,101 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [437734119] [2021-05-02 12:54:30,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:30,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:30,285 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:30,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:30,288 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:54:30,288 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:30,288 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [437734119] [2021-05-02 12:54:30,288 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [437734119] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:30,288 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1019656651] [2021-05-02 12:54:30,288 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 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:30,334 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:54:30,334 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:54:30,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 12:54:30,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:30,386 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:30,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:30,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:30,422 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:54:30,422 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1019656651] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:30,422 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:30,422 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 16 [2021-05-02 12:54:30,423 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547004955] [2021-05-02 12:54:30,423 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 12:54:30,423 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:30,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 12:54:30,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:54:30,423 INFO L87 Difference]: Start difference. First operand 138 states and 173 transitions. Second operand has 16 states, 16 states have (on average 1.875) internal successors, (30), 13 states have internal predecessors, (30), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:30,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:30,981 INFO L93 Difference]: Finished difference Result 352 states and 456 transitions. [2021-05-02 12:54:30,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 12:54:30,982 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.875) internal successors, (30), 13 states have internal predecessors, (30), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-02 12:54:30,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:30,983 INFO L225 Difference]: With dead ends: 352 [2021-05-02 12:54:30,983 INFO L226 Difference]: Without dead ends: 338 [2021-05-02 12:54:30,983 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 44 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 434.8ms TimeCoverageRelationStatistics Valid=80, Invalid=622, Unknown=0, NotChecked=0, Total=702 [2021-05-02 12:54:30,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2021-05-02 12:54:31,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 143. [2021-05-02 12:54:31,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 138 states have (on average 1.2753623188405796) internal successors, (176), 138 states have internal predecessors, (176), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:31,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 180 transitions. [2021-05-02 12:54:31,001 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 180 transitions. Word has length 38 [2021-05-02 12:54:31,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:31,001 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 180 transitions. [2021-05-02 12:54:31,001 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.875) internal successors, (30), 13 states have internal predecessors, (30), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:31,001 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 180 transitions. [2021-05-02 12:54:31,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 12:54:31,002 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:31,002 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:31,208 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,63 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:31,209 INFO L428 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:31,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:31,209 INFO L82 PathProgramCache]: Analyzing trace with hash 1555480447, now seen corresponding path program 57 times [2021-05-02 12:54:31,209 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:31,209 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1020513425] [2021-05-02 12:54:31,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:31,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:31,484 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:31,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:31,488 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 12:54:31,488 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:31,488 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1020513425] [2021-05-02 12:54:31,488 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1020513425] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:31,488 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1665486882] [2021-05-02 12:54:31,488 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 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:31,857 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-05-02 12:54:31,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:54:31,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 36 conjunts are in the unsatisfiable core [2021-05-02 12:54:31,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:31,927 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:31,941 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 12:54:31,941 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1665486882] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:31,941 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:31,941 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-02 12:54:31,942 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [209264316] [2021-05-02 12:54:31,942 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 12:54:31,942 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:31,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 12:54:31,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=374, Unknown=0, NotChecked=0, Total=420 [2021-05-02 12:54:31,942 INFO L87 Difference]: Start difference. First operand 143 states and 180 transitions. Second operand has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 20 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:32,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:32,894 INFO L93 Difference]: Finished difference Result 170 states and 207 transitions. [2021-05-02 12:54:32,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 12:54:32,895 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 20 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-02 12:54:32,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:32,895 INFO L225 Difference]: With dead ends: 170 [2021-05-02 12:54:32,895 INFO L226 Difference]: Without dead ends: 155 [2021-05-02 12:54:32,896 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 254 ImplicationChecksByTransitivity, 907.4ms TimeCoverageRelationStatistics Valid=177, Invalid=1715, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 12:54:32,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-05-02 12:54:32,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 144. [2021-05-02 12:54:32,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 139 states have (on average 1.2733812949640289) internal successors, (177), 139 states have internal predecessors, (177), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:32,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 181 transitions. [2021-05-02 12:54:32,913 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 181 transitions. Word has length 38 [2021-05-02 12:54:32,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:32,913 INFO L480 AbstractCegarLoop]: Abstraction has 144 states and 181 transitions. [2021-05-02 12:54:32,913 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 20 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:32,913 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 181 transitions. [2021-05-02 12:54:32,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 12:54:32,913 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:32,914 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:33,117 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73,64 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:33,118 INFO L428 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:33,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:33,118 INFO L82 PathProgramCache]: Analyzing trace with hash 630692429, now seen corresponding path program 58 times [2021-05-02 12:54:33,118 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:33,118 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1623588331] [2021-05-02 12:54:33,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:33,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:33,368 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:33,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:33,384 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 12:54:33,385 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:33,385 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1623588331] [2021-05-02 12:54:33,385 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1623588331] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:33,385 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2026030366] [2021-05-02 12:54:33,385 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 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:33,433 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:54:33,433 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:54:33,434 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 12:54:33,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:33,500 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:33,515 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 12:54:33,516 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2026030366] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:33,516 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:33,516 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 12:54:33,516 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292846754] [2021-05-02 12:54:33,516 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 12:54:33,516 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:33,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 12:54:33,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=338, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:54:33,517 INFO L87 Difference]: Start difference. First operand 144 states and 181 transitions. Second operand has 20 states, 20 states have (on average 1.4) internal successors, (28), 19 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:34,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:34,442 INFO L93 Difference]: Finished difference Result 173 states and 210 transitions. [2021-05-02 12:54:34,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 12:54:34,442 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.4) internal successors, (28), 19 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 38 [2021-05-02 12:54:34,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:34,443 INFO L225 Difference]: With dead ends: 173 [2021-05-02 12:54:34,443 INFO L226 Difference]: Without dead ends: 157 [2021-05-02 12:54:34,443 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 254 ImplicationChecksByTransitivity, 851.1ms TimeCoverageRelationStatistics Valid=170, Invalid=1636, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 12:54:34,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-05-02 12:54:34,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 145. [2021-05-02 12:54:34,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 140 states have (on average 1.2714285714285714) internal successors, (178), 140 states have internal predecessors, (178), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:34,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 182 transitions. [2021-05-02 12:54:34,461 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 182 transitions. Word has length 38 [2021-05-02 12:54:34,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:34,462 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 182 transitions. [2021-05-02 12:54:34,462 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 1.4) internal successors, (28), 19 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:34,462 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 182 transitions. [2021-05-02 12:54:34,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 12:54:34,462 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:34,462 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:34,684 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74,65 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:34,684 INFO L428 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:34,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:34,685 INFO L82 PathProgramCache]: Analyzing trace with hash -1787736705, now seen corresponding path program 59 times [2021-05-02 12:54:34,685 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:34,685 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [552201664] [2021-05-02 12:54:34,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:34,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:34,880 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:34,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:34,882 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 69 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 12:54:34,882 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:34,882 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [552201664] [2021-05-02 12:54:34,882 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [552201664] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:34,882 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1684253557] [2021-05-02 12:54:34,883 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 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:35,623 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-05-02 12:54:35,624 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:54:35,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-02 12:54:35,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:35,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:35,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:35,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:35,651 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:35,685 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:35,701 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 69 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 12:54:35,702 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1684253557] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:35,702 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:35,702 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 12:54:35,702 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547492548] [2021-05-02 12:54:35,702 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 12:54:35,702 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:35,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 12:54:35,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=304, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:54:35,703 INFO L87 Difference]: Start difference. First operand 145 states and 182 transitions. Second operand has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:36,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:36,505 INFO L93 Difference]: Finished difference Result 176 states and 213 transitions. [2021-05-02 12:54:36,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 12:54:36,505 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-02 12:54:36,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:36,506 INFO L225 Difference]: With dead ends: 176 [2021-05-02 12:54:36,506 INFO L226 Difference]: Without dead ends: 159 [2021-05-02 12:54:36,506 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 654.4ms TimeCoverageRelationStatistics Valid=128, Invalid=1204, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 12:54:36,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-05-02 12:54:36,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 146. [2021-05-02 12:54:36,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 141 states have (on average 1.2695035460992907) internal successors, (179), 141 states have internal predecessors, (179), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:36,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 183 transitions. [2021-05-02 12:54:36,522 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 183 transitions. Word has length 38 [2021-05-02 12:54:36,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:36,522 INFO L480 AbstractCegarLoop]: Abstraction has 146 states and 183 transitions. [2021-05-02 12:54:36,522 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:36,522 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 183 transitions. [2021-05-02 12:54:36,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 12:54:36,523 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:36,523 INFO L523 BasicCegarLoop]: trace histogram [19, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:36,728 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable75 [2021-05-02 12:54:36,728 INFO L428 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:36,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:36,728 INFO L82 PathProgramCache]: Analyzing trace with hash 756119167, now seen corresponding path program 60 times [2021-05-02 12:54:36,728 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:36,728 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1161922828] [2021-05-02 12:54:36,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:36,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:37,090 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:37,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:37,092 INFO L134 CoverageAnalysis]: Checked inductivity of 199 backedges. 0 proven. 193 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 12:54:37,093 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:37,093 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1161922828] [2021-05-02 12:54:37,093 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1161922828] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:37,093 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1591679492] [2021-05-02 12:54:37,093 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:37,155 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-05-02 12:54:37,155 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:54:37,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 12:54:37,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:37,419 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:37,424 INFO L134 CoverageAnalysis]: Checked inductivity of 199 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-05-02 12:54:37,425 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1591679492] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:37,425 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:37,425 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 9] total 33 [2021-05-02 12:54:37,425 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478166558] [2021-05-02 12:54:37,425 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 12:54:37,425 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:37,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 12:54:37,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=988, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 12:54:37,426 INFO L87 Difference]: Start difference. First operand 146 states and 183 transitions. Second operand has 33 states, 33 states have (on average 1.3333333333333333) internal successors, (44), 32 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:41,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:41,793 INFO L93 Difference]: Finished difference Result 249 states and 338 transitions. [2021-05-02 12:54:41,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-05-02 12:54:41,794 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.3333333333333333) internal successors, (44), 32 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-02 12:54:41,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:41,795 INFO L225 Difference]: With dead ends: 249 [2021-05-02 12:54:41,795 INFO L226 Difference]: Without dead ends: 221 [2021-05-02 12:54:41,796 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1928 ImplicationChecksByTransitivity, 3438.5ms TimeCoverageRelationStatistics Valid=448, Invalid=8672, Unknown=0, NotChecked=0, Total=9120 [2021-05-02 12:54:41,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2021-05-02 12:54:41,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 156. [2021-05-02 12:54:41,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 151 states have (on average 1.2582781456953642) internal successors, (190), 151 states have internal predecessors, (190), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:41,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 194 transitions. [2021-05-02 12:54:41,817 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 194 transitions. Word has length 38 [2021-05-02 12:54:41,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:41,817 INFO L480 AbstractCegarLoop]: Abstraction has 156 states and 194 transitions. [2021-05-02 12:54:41,817 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 1.3333333333333333) internal successors, (44), 32 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:41,817 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 194 transitions. [2021-05-02 12:54:41,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 12:54:41,818 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:41,818 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:42,032 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable76 [2021-05-02 12:54:42,033 INFO L428 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:42,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:42,033 INFO L82 PathProgramCache]: Analyzing trace with hash 638163759, now seen corresponding path program 61 times [2021-05-02 12:54:42,033 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:42,033 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1778509651] [2021-05-02 12:54:42,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:42,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:42,353 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:42,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:42,356 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 9 proven. 72 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:54:42,356 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:42,356 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1778509651] [2021-05-02 12:54:42,356 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1778509651] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:42,356 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [48619412] [2021-05-02 12:54:42,356 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:42,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:42,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 54 conjunts are in the unsatisfiable core [2021-05-02 12:54:42,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:42,757 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 9 proven. 72 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:54:42,757 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [48619412] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:42,757 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:42,757 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 30 [2021-05-02 12:54:42,757 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [59847684] [2021-05-02 12:54:42,757 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 12:54:42,757 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:42,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 12:54:42,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=795, Unknown=0, NotChecked=0, Total=870 [2021-05-02 12:54:42,758 INFO L87 Difference]: Start difference. First operand 156 states and 194 transitions. Second operand has 30 states, 30 states have (on average 1.3) internal successors, (39), 29 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:43,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:43,504 INFO L93 Difference]: Finished difference Result 170 states and 207 transitions. [2021-05-02 12:54:43,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 12:54:43,504 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.3) internal successors, (39), 29 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2021-05-02 12:54:43,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:43,505 INFO L225 Difference]: With dead ends: 170 [2021-05-02 12:54:43,505 INFO L226 Difference]: Without dead ends: 145 [2021-05-02 12:54:43,505 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 333 ImplicationChecksByTransitivity, 1065.5ms TimeCoverageRelationStatistics Valid=174, Invalid=2082, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 12:54:43,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2021-05-02 12:54:43,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 145. [2021-05-02 12:54:43,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 140 states have (on average 1.2642857142857142) internal successors, (177), 140 states have internal predecessors, (177), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:43,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 181 transitions. [2021-05-02 12:54:43,529 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 181 transitions. Word has length 39 [2021-05-02 12:54:43,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:43,529 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 181 transitions. [2021-05-02 12:54:43,529 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 1.3) internal successors, (39), 29 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:43,529 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 181 transitions. [2021-05-02 12:54:43,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 12:54:43,529 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:43,529 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:43,729 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77,68 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:43,730 INFO L428 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:43,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:43,730 INFO L82 PathProgramCache]: Analyzing trace with hash 1865343295, now seen corresponding path program 62 times [2021-05-02 12:54:43,730 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:43,730 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1781135341] [2021-05-02 12:54:43,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:43,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:43,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:43,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:43,980 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 0 proven. 73 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 12:54:43,980 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:43,980 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1781135341] [2021-05-02 12:54:43,980 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1781135341] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:43,980 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1148232368] [2021-05-02 12:54:43,980 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 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:44,024 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:54:44,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:54:44,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 52 conjunts are in the unsatisfiable core [2021-05-02 12:54:44,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:44,274 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 0 proven. 73 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 12:54:44,275 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1148232368] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:44,275 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:44,275 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 29 [2021-05-02 12:54:44,275 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610411036] [2021-05-02 12:54:44,275 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 12:54:44,275 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:44,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 12:54:44,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=727, Unknown=0, NotChecked=0, Total=812 [2021-05-02 12:54:44,276 INFO L87 Difference]: Start difference. First operand 145 states and 181 transitions. Second operand has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 28 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:45,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:45,105 INFO L93 Difference]: Finished difference Result 172 states and 208 transitions. [2021-05-02 12:54:45,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 12:54:45,105 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 28 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2021-05-02 12:54:45,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:45,106 INFO L225 Difference]: With dead ends: 172 [2021-05-02 12:54:45,106 INFO L226 Difference]: Without dead ends: 157 [2021-05-02 12:54:45,106 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 318 ImplicationChecksByTransitivity, 885.8ms TimeCoverageRelationStatistics Valid=188, Invalid=1974, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 12:54:45,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-05-02 12:54:45,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 146. [2021-05-02 12:54:45,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 141 states have (on average 1.2624113475177305) internal successors, (178), 141 states have internal predecessors, (178), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:45,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 182 transitions. [2021-05-02 12:54:45,125 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 182 transitions. Word has length 39 [2021-05-02 12:54:45,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:45,125 INFO L480 AbstractCegarLoop]: Abstraction has 146 states and 182 transitions. [2021-05-02 12:54:45,125 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 28 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:45,125 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 182 transitions. [2021-05-02 12:54:45,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 12:54:45,125 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:45,125 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:45,340 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable78 [2021-05-02 12:54:45,341 INFO L428 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:45,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:45,341 INFO L82 PathProgramCache]: Analyzing trace with hash -1135246993, now seen corresponding path program 63 times [2021-05-02 12:54:45,341 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:45,341 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [624433122] [2021-05-02 12:54:45,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:45,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:45,580 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:45,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:45,597 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 12:54:45,597 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:45,597 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [624433122] [2021-05-02 12:54:45,597 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [624433122] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:45,597 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [627040346] [2021-05-02 12:54:45,597 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 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:45,873 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-05-02 12:54:45,873 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:54:45,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 12:54:45,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:45,931 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:45,946 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 12:54:45,946 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [627040346] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:45,946 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:45,946 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-02 12:54:45,946 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681696567] [2021-05-02 12:54:45,947 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 12:54:45,947 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:45,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 12:54:45,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=375, Unknown=0, NotChecked=0, Total=420 [2021-05-02 12:54:45,947 INFO L87 Difference]: Start difference. First operand 146 states and 182 transitions. Second operand has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 20 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:46,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:46,927 INFO L93 Difference]: Finished difference Result 175 states and 211 transitions. [2021-05-02 12:54:46,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 12:54:46,927 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 20 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2021-05-02 12:54:46,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:46,928 INFO L225 Difference]: With dead ends: 175 [2021-05-02 12:54:46,928 INFO L226 Difference]: Without dead ends: 159 [2021-05-02 12:54:46,929 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 233 ImplicationChecksByTransitivity, 829.0ms TimeCoverageRelationStatistics Valid=166, Invalid=1640, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 12:54:46,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-05-02 12:54:46,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 147. [2021-05-02 12:54:46,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 142 states have (on average 1.2605633802816902) internal successors, (179), 142 states have internal predecessors, (179), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:46,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 183 transitions. [2021-05-02 12:54:46,947 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 183 transitions. Word has length 39 [2021-05-02 12:54:46,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:46,948 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 183 transitions. [2021-05-02 12:54:46,948 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 20 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:46,948 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 183 transitions. [2021-05-02 12:54:46,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 12:54:46,948 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:46,948 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:47,164 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable79 [2021-05-02 12:54:47,165 INFO L428 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:47,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:47,165 INFO L82 PathProgramCache]: Analyzing trace with hash -1958069505, now seen corresponding path program 64 times [2021-05-02 12:54:47,165 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:47,165 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [723342469] [2021-05-02 12:54:47,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:47,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:47,401 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:47,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:47,409 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 12:54:47,409 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:47,409 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [723342469] [2021-05-02 12:54:47,410 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [723342469] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:47,410 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1224548163] [2021-05-02 12:54:47,410 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 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:47,457 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:54:47,458 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:54:47,458 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 12:54:47,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:47,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:47,530 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 12:54:47,530 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1224548163] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:47,530 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:47,530 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 12:54:47,531 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508949749] [2021-05-02 12:54:47,531 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 12:54:47,531 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:47,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 12:54:47,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=339, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:54:47,531 INFO L87 Difference]: Start difference. First operand 147 states and 183 transitions. Second operand has 20 states, 20 states have (on average 1.4) internal successors, (28), 19 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:48,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:48,450 INFO L93 Difference]: Finished difference Result 178 states and 214 transitions. [2021-05-02 12:54:48,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 12:54:48,450 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.4) internal successors, (28), 19 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 39 [2021-05-02 12:54:48,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:48,451 INFO L225 Difference]: With dead ends: 178 [2021-05-02 12:54:48,451 INFO L226 Difference]: Without dead ends: 161 [2021-05-02 12:54:48,452 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 782.9ms TimeCoverageRelationStatistics Valid=152, Invalid=1488, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 12:54:48,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-05-02 12:54:48,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 148. [2021-05-02 12:54:48,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 143 states have (on average 1.2587412587412588) internal successors, (180), 143 states have internal predecessors, (180), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:48,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 184 transitions. [2021-05-02 12:54:48,470 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 184 transitions. Word has length 39 [2021-05-02 12:54:48,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:48,470 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 184 transitions. [2021-05-02 12:54:48,470 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 1.4) internal successors, (28), 19 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:48,470 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 184 transitions. [2021-05-02 12:54:48,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 12:54:48,470 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:48,471 INFO L523 BasicCegarLoop]: trace histogram [20, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:48,685 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80,71 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:48,686 INFO L428 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:48,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:48,686 INFO L82 PathProgramCache]: Analyzing trace with hash -1580653169, now seen corresponding path program 65 times [2021-05-02 12:54:48,686 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:48,686 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1938046905] [2021-05-02 12:54:48,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:48,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:49,191 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:49,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:49,194 INFO L134 CoverageAnalysis]: Checked inductivity of 219 backedges. 0 proven. 216 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:54:49,194 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:49,194 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1938046905] [2021-05-02 12:54:49,194 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1938046905] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:49,194 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [488813221] [2021-05-02 12:54:49,194 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 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:56,628 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 11 check-sat command(s) [2021-05-02 12:54:56,628 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:54:56,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 51 conjunts are in the unsatisfiable core [2021-05-02 12:54:56,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:56,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:56,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:56,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:56,683 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:56,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:54:56,737 INFO L134 CoverageAnalysis]: Checked inductivity of 219 backedges. 0 proven. 213 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 12:54:56,737 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [488813221] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:56,737 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:56,738 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 23] total 28 [2021-05-02 12:54:56,738 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573349498] [2021-05-02 12:54:56,738 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 12:54:56,738 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:56,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 12:54:56,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=700, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:54:56,738 INFO L87 Difference]: Start difference. First operand 148 states and 184 transitions. Second operand has 28 states, 28 states have (on average 1.4642857142857142) internal successors, (41), 27 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:58,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:54:58,760 INFO L93 Difference]: Finished difference Result 227 states and 311 transitions. [2021-05-02 12:54:58,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 12:54:58,760 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.4642857142857142) internal successors, (41), 27 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2021-05-02 12:54:58,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:54:58,761 INFO L225 Difference]: With dead ends: 227 [2021-05-02 12:54:58,761 INFO L226 Difference]: Without dead ends: 217 [2021-05-02 12:54:58,761 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 38 SyntacticMatches, 3 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 456 ImplicationChecksByTransitivity, 1464.8ms TimeCoverageRelationStatistics Valid=212, Invalid=3210, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 12:54:58,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2021-05-02 12:54:58,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 156. [2021-05-02 12:54:58,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 151 states have (on average 1.2582781456953642) internal successors, (190), 151 states have internal predecessors, (190), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:58,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 194 transitions. [2021-05-02 12:54:58,774 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 194 transitions. Word has length 39 [2021-05-02 12:54:58,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:54:58,774 INFO L480 AbstractCegarLoop]: Abstraction has 156 states and 194 transitions. [2021-05-02 12:54:58,774 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.4642857142857142) internal successors, (41), 27 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:54:58,774 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 194 transitions. [2021-05-02 12:54:58,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 12:54:58,775 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:54:58,775 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:54:58,979 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81,72 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:58,980 INFO L428 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:54:58,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:54:58,980 INFO L82 PathProgramCache]: Analyzing trace with hash -1413810305, now seen corresponding path program 66 times [2021-05-02 12:54:58,980 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:54:58,980 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [772178788] [2021-05-02 12:54:58,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:54:58,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:59,293 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:54:59,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:54:59,296 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 12:54:59,296 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:54:59,296 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [772178788] [2021-05-02 12:54:59,296 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [772178788] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:59,296 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [56294710] [2021-05-02 12:54:59,296 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:54:59,495 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-05-02 12:54:59,495 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:54:59,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 56 conjunts are in the unsatisfiable core [2021-05-02 12:54:59,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:54:59,830 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 12:54:59,830 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [56294710] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:54:59,830 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:54:59,830 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 31 [2021-05-02 12:54:59,830 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525101229] [2021-05-02 12:54:59,830 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 12:54:59,830 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:54:59,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 12:54:59,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=837, Unknown=0, NotChecked=0, Total=930 [2021-05-02 12:54:59,831 INFO L87 Difference]: Start difference. First operand 156 states and 194 transitions. Second operand has 31 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 30 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:00,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:55:00,768 INFO L93 Difference]: Finished difference Result 183 states and 221 transitions. [2021-05-02 12:55:00,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 12:55:00,768 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 30 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2021-05-02 12:55:00,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:55:00,769 INFO L225 Difference]: With dead ends: 183 [2021-05-02 12:55:00,769 INFO L226 Difference]: Without dead ends: 168 [2021-05-02 12:55:00,769 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 370 ImplicationChecksByTransitivity, 1078.5ms TimeCoverageRelationStatistics Valid=204, Invalid=2246, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 12:55:00,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-05-02 12:55:00,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 157. [2021-05-02 12:55:00,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 152 states have (on average 1.256578947368421) internal successors, (191), 152 states have internal predecessors, (191), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:00,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 195 transitions. [2021-05-02 12:55:00,793 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 195 transitions. Word has length 40 [2021-05-02 12:55:00,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:55:00,793 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 195 transitions. [2021-05-02 12:55:00,793 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 30 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:00,793 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 195 transitions. [2021-05-02 12:55:00,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 12:55:00,793 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:55:00,794 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:55:01,015 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82,73 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:01,016 INFO L428 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:55:01,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:55:01,016 INFO L82 PathProgramCache]: Analyzing trace with hash -44794227, now seen corresponding path program 67 times [2021-05-02 12:55:01,016 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:55:01,016 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [40760533] [2021-05-02 12:55:01,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:55:01,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:01,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:55:01,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:01,357 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 12:55:01,357 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:55:01,357 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [40760533] [2021-05-02 12:55:01,357 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [40760533] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:01,357 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [157337615] [2021-05-02 12:55:01,357 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:01,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:01,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-02 12:55:01,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:55:01,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:01,500 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 12:55:01,500 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [157337615] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:01,500 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:55:01,500 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-02 12:55:01,500 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546905945] [2021-05-02 12:55:01,501 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 12:55:01,501 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:55:01,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 12:55:01,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=414, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:55:01,501 INFO L87 Difference]: Start difference. First operand 157 states and 195 transitions. Second operand has 22 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 21 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 12:55:02,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:55:02,626 INFO L93 Difference]: Finished difference Result 186 states and 224 transitions. [2021-05-02 12:55:02,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 12:55:02,626 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 21 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 40 [2021-05-02 12:55:02,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:55:02,627 INFO L225 Difference]: With dead ends: 186 [2021-05-02 12:55:02,627 INFO L226 Difference]: Without dead ends: 170 [2021-05-02 12:55:02,627 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 276 ImplicationChecksByTransitivity, 1069.8ms TimeCoverageRelationStatistics Valid=183, Invalid=1887, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 12:55:02,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-05-02 12:55:02,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 158. [2021-05-02 12:55:02,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 153 states have (on average 1.2549019607843137) internal successors, (192), 153 states have internal predecessors, (192), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:02,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 196 transitions. [2021-05-02 12:55:02,651 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 196 transitions. Word has length 40 [2021-05-02 12:55:02,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:55:02,652 INFO L480 AbstractCegarLoop]: Abstraction has 158 states and 196 transitions. [2021-05-02 12:55:02,652 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 21 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 12:55:02,652 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 196 transitions. [2021-05-02 12:55:02,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 12:55:02,652 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:55:02,652 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:55:02,874 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83,74 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:02,874 INFO L428 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:55:02,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:55:02,875 INFO L82 PathProgramCache]: Analyzing trace with hash 1351548287, now seen corresponding path program 68 times [2021-05-02 12:55:02,875 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:55:02,875 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [899570899] [2021-05-02 12:55:02,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:55:02,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:03,143 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:55:03,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:03,145 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 12:55:03,145 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:55:03,146 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [899570899] [2021-05-02 12:55:03,146 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [899570899] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:03,146 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1371892761] [2021-05-02 12:55:03,146 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 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:03,200 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:55:03,200 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:55:03,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 12:55:03,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:55:03,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:03,286 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 12:55:03,286 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1371892761] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:03,287 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:55:03,287 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-02 12:55:03,287 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1939370838] [2021-05-02 12:55:03,287 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 12:55:03,287 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:55:03,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 12:55:03,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=376, Unknown=0, NotChecked=0, Total=420 [2021-05-02 12:55:03,287 INFO L87 Difference]: Start difference. First operand 158 states and 196 transitions. Second operand has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 20 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:04,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:55:04,365 INFO L93 Difference]: Finished difference Result 189 states and 227 transitions. [2021-05-02 12:55:04,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 12:55:04,365 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 20 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2021-05-02 12:55:04,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:55:04,366 INFO L225 Difference]: With dead ends: 189 [2021-05-02 12:55:04,366 INFO L226 Difference]: Without dead ends: 172 [2021-05-02 12:55:04,366 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 985.3ms TimeCoverageRelationStatistics Valid=176, Invalid=1804, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 12:55:04,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-05-02 12:55:04,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 159. [2021-05-02 12:55:04,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 154 states have (on average 1.2532467532467533) internal successors, (193), 154 states have internal predecessors, (193), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:04,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 197 transitions. [2021-05-02 12:55:04,391 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 197 transitions. Word has length 40 [2021-05-02 12:55:04,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:55:04,391 INFO L480 AbstractCegarLoop]: Abstraction has 159 states and 197 transitions. [2021-05-02 12:55:04,391 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 20 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:04,391 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 197 transitions. [2021-05-02 12:55:04,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 12:55:04,392 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:55:04,392 INFO L523 BasicCegarLoop]: trace histogram [21, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:55:04,615 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable84 [2021-05-02 12:55:04,616 INFO L428 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:55:04,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:55:04,616 INFO L82 PathProgramCache]: Analyzing trace with hash 1659771214, now seen corresponding path program 69 times [2021-05-02 12:55:04,616 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:55:04,616 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1033485610] [2021-05-02 12:55:04,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:55:04,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:05,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:55:05,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:05,084 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 237 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:55:05,084 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:55:05,084 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1033485610] [2021-05-02 12:55:05,084 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1033485610] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:05,084 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1197726462] [2021-05-02 12:55:05,084 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 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:05,133 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 12:55:05,133 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:55:05,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 12:55:05,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:55:05,354 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2021-05-02 12:55:05,354 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1197726462] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:05,354 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:55:05,354 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 8] total 35 [2021-05-02 12:55:05,354 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180057650] [2021-05-02 12:55:05,354 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 12:55:05,354 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:55:05,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 12:55:05,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=1057, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 12:55:05,355 INFO L87 Difference]: Start difference. First operand 159 states and 197 transitions. Second operand has 35 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 34 states have internal predecessors, (47), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:10,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:55:10,194 INFO L93 Difference]: Finished difference Result 258 states and 354 transitions. [2021-05-02 12:55:10,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-05-02 12:55:10,194 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 34 states have internal predecessors, (47), 2 states have call successors, (4), 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 40 [2021-05-02 12:55:10,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:55:10,195 INFO L225 Difference]: With dead ends: 258 [2021-05-02 12:55:10,195 INFO L226 Difference]: Without dead ends: 248 [2021-05-02 12:55:10,196 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3008 ImplicationChecksByTransitivity, 3795.5ms TimeCoverageRelationStatistics Valid=1196, Invalid=11014, Unknown=0, NotChecked=0, Total=12210 [2021-05-02 12:55:10,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2021-05-02 12:55:10,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 171. [2021-05-02 12:55:10,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 166 states have (on average 1.2409638554216869) internal successors, (206), 166 states have internal predecessors, (206), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:10,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 210 transitions. [2021-05-02 12:55:10,211 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 210 transitions. Word has length 40 [2021-05-02 12:55:10,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:55:10,211 INFO L480 AbstractCegarLoop]: Abstraction has 171 states and 210 transitions. [2021-05-02 12:55:10,211 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 34 states have internal predecessors, (47), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:10,211 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 210 transitions. [2021-05-02 12:55:10,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 12:55:10,211 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:55:10,211 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:55:10,412 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable85,76 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:10,412 INFO L428 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:55:10,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:55:10,412 INFO L82 PathProgramCache]: Analyzing trace with hash 11643199, now seen corresponding path program 70 times [2021-05-02 12:55:10,413 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:55:10,413 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1869749687] [2021-05-02 12:55:10,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:55:10,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:10,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:55:10,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:10,776 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 12:55:10,776 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:55:10,776 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1869749687] [2021-05-02 12:55:10,776 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1869749687] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:10,776 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [40845205] [2021-05-02 12:55:10,776 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 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:10,840 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:55:10,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:55:10,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-02 12:55:10,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:55:10,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:10,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:10,904 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:10,925 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:10,945 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 12:55:10,945 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [40845205] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:10,945 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:55:10,945 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 17 [2021-05-02 12:55:10,945 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106687270] [2021-05-02 12:55:10,946 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 12:55:10,946 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:55:10,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 12:55:10,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=239, Unknown=0, NotChecked=0, Total=272 [2021-05-02 12:55:10,947 INFO L87 Difference]: Start difference. First operand 171 states and 210 transitions. Second operand has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:11,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:55:11,711 INFO L93 Difference]: Finished difference Result 438 states and 561 transitions. [2021-05-02 12:55:11,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 12:55:11,712 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-02 12:55:11,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:55:11,713 INFO L225 Difference]: With dead ends: 438 [2021-05-02 12:55:11,713 INFO L226 Difference]: Without dead ends: 423 [2021-05-02 12:55:11,714 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 48 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 593.1ms TimeCoverageRelationStatistics Valid=86, Invalid=726, Unknown=0, NotChecked=0, Total=812 [2021-05-02 12:55:11,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 423 states. [2021-05-02 12:55:11,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 423 to 177. [2021-05-02 12:55:11,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 172 states have (on average 1.244186046511628) internal successors, (214), 172 states have internal predecessors, (214), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:11,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 218 transitions. [2021-05-02 12:55:11,738 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 218 transitions. Word has length 41 [2021-05-02 12:55:11,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:55:11,738 INFO L480 AbstractCegarLoop]: Abstraction has 177 states and 218 transitions. [2021-05-02 12:55:11,738 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:11,738 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 218 transitions. [2021-05-02 12:55:11,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 12:55:11,739 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:55:11,739 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:55:11,961 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86,77 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:11,961 INFO L428 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:55:11,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:55:11,961 INFO L82 PathProgramCache]: Analyzing trace with hash -600496849, now seen corresponding path program 71 times [2021-05-02 12:55:11,961 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:55:11,962 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1596428574] [2021-05-02 12:55:11,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:55:11,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:12,243 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:55:12,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:12,247 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 0 proven. 83 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 12:55:12,247 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:55:12,247 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1596428574] [2021-05-02 12:55:12,247 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1596428574] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:12,247 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1669141242] [2021-05-02 12:55:12,247 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 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:14,221 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 12:55:14,222 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:55:14,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 80 conjunts are in the unsatisfiable core [2021-05-02 12:55:14,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:55:14,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:14,275 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:14,283 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:14,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:14,628 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:14,640 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:14,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:14,663 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:15,109 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 0 proven. 83 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 12:55:15,109 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1669141242] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:15,109 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:55:15,109 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 36 [2021-05-02 12:55:15,109 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315247222] [2021-05-02 12:55:15,110 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 12:55:15,110 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:55:15,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 12:55:15,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1155, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 12:55:15,111 INFO L87 Difference]: Start difference. First operand 177 states and 218 transitions. Second operand has 36 states, 36 states have (on average 1.2777777777777777) internal successors, (46), 35 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:16,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:55:16,953 INFO L93 Difference]: Finished difference Result 206 states and 247 transitions. [2021-05-02 12:55:16,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 12:55:16,957 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.2777777777777777) internal successors, (46), 35 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-02 12:55:16,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:55:16,958 INFO L225 Difference]: With dead ends: 206 [2021-05-02 12:55:16,958 INFO L226 Difference]: Without dead ends: 190 [2021-05-02 12:55:16,958 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1016 ImplicationChecksByTransitivity, 2247.2ms TimeCoverageRelationStatistics Valid=302, Invalid=4254, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 12:55:16,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-05-02 12:55:16,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 178. [2021-05-02 12:55:16,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 173 states have (on average 1.2427745664739884) internal successors, (215), 173 states have internal predecessors, (215), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:16,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 219 transitions. [2021-05-02 12:55:16,977 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 219 transitions. Word has length 41 [2021-05-02 12:55:16,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:55:16,978 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 219 transitions. [2021-05-02 12:55:16,978 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 1.2777777777777777) internal successors, (46), 35 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:16,978 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 219 transitions. [2021-05-02 12:55:16,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 12:55:16,978 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:55:16,978 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:55:17,180 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable88 [2021-05-02 12:55:17,181 INFO L428 AbstractCegarLoop]: === Iteration 81 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:55:17,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:55:17,181 INFO L82 PathProgramCache]: Analyzing trace with hash 870484735, now seen corresponding path program 72 times [2021-05-02 12:55:17,181 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:55:17,181 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1100617207] [2021-05-02 12:55:17,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:55:17,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:17,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:55:17,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:17,467 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 12:55:17,467 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:55:17,467 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1100617207] [2021-05-02 12:55:17,467 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1100617207] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:17,467 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1144466921] [2021-05-02 12:55:17,467 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:18,285 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 12:55:18,285 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:55:18,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 12:55:18,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:55:18,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:18,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:18,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:18,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:18,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:18,392 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 12:55:18,392 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1144466921] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:18,392 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:55:18,392 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-02 12:55:18,392 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090286286] [2021-05-02 12:55:18,393 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 12:55:18,393 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:55:18,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 12:55:18,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=415, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:55:18,393 INFO L87 Difference]: Start difference. First operand 178 states and 219 transitions. Second operand has 22 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 21 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 12:55:19,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:55:19,685 INFO L93 Difference]: Finished difference Result 209 states and 250 transitions. [2021-05-02 12:55:19,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 12:55:19,686 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 21 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 41 [2021-05-02 12:55:19,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:55:19,687 INFO L225 Difference]: With dead ends: 209 [2021-05-02 12:55:19,687 INFO L226 Difference]: Without dead ends: 192 [2021-05-02 12:55:19,687 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 1077.3ms TimeCoverageRelationStatistics Valid=200, Invalid=2152, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 12:55:19,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2021-05-02 12:55:19,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 179. [2021-05-02 12:55:19,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 174 states have (on average 1.2413793103448276) internal successors, (216), 174 states have internal predecessors, (216), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:19,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 220 transitions. [2021-05-02 12:55:19,703 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 220 transitions. Word has length 41 [2021-05-02 12:55:19,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:55:19,703 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 220 transitions. [2021-05-02 12:55:19,703 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 21 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 12:55:19,704 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 220 transitions. [2021-05-02 12:55:19,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 12:55:19,704 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:55:19,704 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:55:19,907 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable89 [2021-05-02 12:55:19,908 INFO L428 AbstractCegarLoop]: === Iteration 82 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:55:19,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:55:19,908 INFO L82 PathProgramCache]: Analyzing trace with hash 1132790639, now seen corresponding path program 73 times [2021-05-02 12:55:19,908 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:55:19,908 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1118513261] [2021-05-02 12:55:19,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:55:19,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:20,155 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:55:20,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:20,158 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-05-02 12:55:20,158 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:55:20,158 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1118513261] [2021-05-02 12:55:20,158 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1118513261] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:20,158 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1711205451] [2021-05-02 12:55:20,158 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:20,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:20,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 12:55:20,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:55:20,275 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:20,294 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-05-02 12:55:20,294 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1711205451] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:20,294 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:55:20,294 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-02 12:55:20,294 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206100103] [2021-05-02 12:55:20,295 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 12:55:20,295 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:55:20,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 12:55:20,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=377, Unknown=0, NotChecked=0, Total=420 [2021-05-02 12:55:20,295 INFO L87 Difference]: Start difference. First operand 179 states and 220 transitions. Second operand has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 20 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:21,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:55:21,514 INFO L93 Difference]: Finished difference Result 212 states and 253 transitions. [2021-05-02 12:55:21,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 12:55:21,514 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 20 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-02 12:55:21,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:55:21,515 INFO L225 Difference]: With dead ends: 212 [2021-05-02 12:55:21,515 INFO L226 Difference]: Without dead ends: 194 [2021-05-02 12:55:21,515 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 258 ImplicationChecksByTransitivity, 1006.2ms TimeCoverageRelationStatistics Valid=165, Invalid=1727, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 12:55:21,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-05-02 12:55:21,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 180. [2021-05-02 12:55:21,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 175 states have (on average 1.24) internal successors, (217), 175 states have internal predecessors, (217), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:21,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 221 transitions. [2021-05-02 12:55:21,534 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 221 transitions. Word has length 41 [2021-05-02 12:55:21,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:55:21,535 INFO L480 AbstractCegarLoop]: Abstraction has 180 states and 221 transitions. [2021-05-02 12:55:21,535 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 20 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:21,535 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 221 transitions. [2021-05-02 12:55:21,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 12:55:21,535 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:55:21,535 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:55:21,735 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90,80 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:21,736 INFO L428 AbstractCegarLoop]: === Iteration 83 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:55:21,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:55:21,736 INFO L82 PathProgramCache]: Analyzing trace with hash 1251028863, now seen corresponding path program 74 times [2021-05-02 12:55:21,736 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:55:21,736 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1032107149] [2021-05-02 12:55:21,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:55:21,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:22,128 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:55:22,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:22,145 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 12:55:22,145 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:55:22,145 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1032107149] [2021-05-02 12:55:22,146 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1032107149] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:22,146 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1883026462] [2021-05-02 12:55:22,146 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 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:22,205 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:55:22,205 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:55:22,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 60 conjunts are in the unsatisfiable core [2021-05-02 12:55:22,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:55:22,542 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 12:55:22,542 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1883026462] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:22,543 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:55:22,543 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 33 [2021-05-02 12:55:22,543 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1925566185] [2021-05-02 12:55:22,543 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 12:55:22,543 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:55:22,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 12:55:22,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=973, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 12:55:22,543 INFO L87 Difference]: Start difference. First operand 180 states and 221 transitions. Second operand has 33 states, 33 states have (on average 1.2727272727272727) internal successors, (42), 32 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:23,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:55:23,427 INFO L93 Difference]: Finished difference Result 195 states and 235 transitions. [2021-05-02 12:55:23,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 12:55:23,428 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.2727272727272727) internal successors, (42), 32 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2021-05-02 12:55:23,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:55:23,428 INFO L225 Difference]: With dead ends: 195 [2021-05-02 12:55:23,428 INFO L226 Difference]: Without dead ends: 168 [2021-05-02 12:55:23,429 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 415 ImplicationChecksByTransitivity, 1190.7ms TimeCoverageRelationStatistics Valid=193, Invalid=2563, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 12:55:23,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-05-02 12:55:23,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2021-05-02 12:55:23,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 163 states have (on average 1.2453987730061349) internal successors, (203), 163 states have internal predecessors, (203), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:23,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 207 transitions. [2021-05-02 12:55:23,449 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 207 transitions. Word has length 42 [2021-05-02 12:55:23,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:55:23,449 INFO L480 AbstractCegarLoop]: Abstraction has 168 states and 207 transitions. [2021-05-02 12:55:23,449 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 1.2727272727272727) internal successors, (42), 32 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:23,449 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 207 transitions. [2021-05-02 12:55:23,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 12:55:23,449 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:55:23,449 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:55:23,650 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91,81 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:23,650 INFO L428 AbstractCegarLoop]: === Iteration 84 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:55:23,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:55:23,650 INFO L82 PathProgramCache]: Analyzing trace with hash -647408947, now seen corresponding path program 75 times [2021-05-02 12:55:23,650 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:55:23,650 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [943024795] [2021-05-02 12:55:23,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:55:23,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:24,000 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:55:24,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:24,004 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 12:55:24,004 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:55:24,004 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [943024795] [2021-05-02 12:55:24,004 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [943024795] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:24,004 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [879974931] [2021-05-02 12:55:24,004 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 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:24,394 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-05-02 12:55:24,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:55:24,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 58 conjunts are in the unsatisfiable core [2021-05-02 12:55:24,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:55:24,686 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 12:55:24,686 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [879974931] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:24,686 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:55:24,686 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 32 [2021-05-02 12:55:24,687 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603663712] [2021-05-02 12:55:24,687 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 12:55:24,687 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:55:24,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 12:55:24,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=897, Unknown=0, NotChecked=0, Total=992 [2021-05-02 12:55:24,687 INFO L87 Difference]: Start difference. First operand 168 states and 207 transitions. Second operand has 32 states, 32 states have (on average 1.25) internal successors, (40), 31 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:25,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:55:25,710 INFO L93 Difference]: Finished difference Result 197 states and 236 transitions. [2021-05-02 12:55:25,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 12:55:25,710 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.25) internal successors, (40), 31 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2021-05-02 12:55:25,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:55:25,711 INFO L225 Difference]: With dead ends: 197 [2021-05-02 12:55:25,711 INFO L226 Difference]: Without dead ends: 181 [2021-05-02 12:55:25,711 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 398 ImplicationChecksByTransitivity, 1151.4ms TimeCoverageRelationStatistics Valid=210, Invalid=2442, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 12:55:25,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2021-05-02 12:55:25,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 169. [2021-05-02 12:55:25,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 164 states have (on average 1.2439024390243902) internal successors, (204), 164 states have internal predecessors, (204), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:25,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 208 transitions. [2021-05-02 12:55:25,727 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 208 transitions. Word has length 42 [2021-05-02 12:55:25,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:55:25,728 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 208 transitions. [2021-05-02 12:55:25,728 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.25) internal successors, (40), 31 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:25,728 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 208 transitions. [2021-05-02 12:55:25,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 12:55:25,728 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:55:25,728 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:55:25,929 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92,82 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:25,930 INFO L428 AbstractCegarLoop]: === Iteration 85 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:55:25,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:55:25,930 INFO L82 PathProgramCache]: Analyzing trace with hash -1157583489, now seen corresponding path program 76 times [2021-05-02 12:55:25,930 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:55:25,930 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1053661827] [2021-05-02 12:55:25,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:55:25,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:26,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:55:26,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:26,238 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 12:55:26,239 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:55:26,239 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1053661827] [2021-05-02 12:55:26,239 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1053661827] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:26,239 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [8703874] [2021-05-02 12:55:26,239 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 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:26,286 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:55:26,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:55:26,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 12:55:26,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:55:26,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:26,402 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 12:55:26,402 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [8703874] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:26,402 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:55:26,402 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 12:55:26,403 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598819053] [2021-05-02 12:55:26,403 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 12:55:26,403 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:55:26,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 12:55:26,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=456, Unknown=0, NotChecked=0, Total=506 [2021-05-02 12:55:26,403 INFO L87 Difference]: Start difference. First operand 169 states and 208 transitions. Second operand has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 22 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:27,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:55:27,656 INFO L93 Difference]: Finished difference Result 200 states and 239 transitions. [2021-05-02 12:55:27,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 12:55:27,657 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 22 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2021-05-02 12:55:27,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:55:27,658 INFO L225 Difference]: With dead ends: 200 [2021-05-02 12:55:27,658 INFO L226 Difference]: Without dead ends: 183 [2021-05-02 12:55:27,658 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 301 ImplicationChecksByTransitivity, 1068.8ms TimeCoverageRelationStatistics Valid=189, Invalid=2067, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 12:55:27,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2021-05-02 12:55:27,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 170. [2021-05-02 12:55:27,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 165 states have (on average 1.2424242424242424) internal successors, (205), 165 states have internal predecessors, (205), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:27,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 209 transitions. [2021-05-02 12:55:27,674 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 209 transitions. Word has length 42 [2021-05-02 12:55:27,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:55:27,674 INFO L480 AbstractCegarLoop]: Abstraction has 170 states and 209 transitions. [2021-05-02 12:55:27,674 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 22 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:27,675 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 209 transitions. [2021-05-02 12:55:27,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 12:55:27,675 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:55:27,675 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:55:27,876 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable93,83 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:27,878 INFO L428 AbstractCegarLoop]: === Iteration 86 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:55:27,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:55:27,878 INFO L82 PathProgramCache]: Analyzing trace with hash -820638515, now seen corresponding path program 77 times [2021-05-02 12:55:27,879 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:55:27,879 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [233474654] [2021-05-02 12:55:27,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:55:27,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:28,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:55:28,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:28,185 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 0 proven. 88 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-05-02 12:55:28,185 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:55:28,186 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [233474654] [2021-05-02 12:55:28,186 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [233474654] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:28,186 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470486999] [2021-05-02 12:55:28,186 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 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:29,435 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-05-02 12:55:29,436 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:55:29,438 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 12:55:29,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:55:29,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:29,470 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:29,562 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:29,582 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 0 proven. 88 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-05-02 12:55:29,582 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [470486999] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:29,582 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:55:29,583 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-02 12:55:29,583 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466125674] [2021-05-02 12:55:29,583 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 12:55:29,583 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:55:29,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 12:55:29,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=416, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:55:29,584 INFO L87 Difference]: Start difference. First operand 170 states and 209 transitions. Second operand has 22 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 21 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 12:55:30,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:55:30,880 INFO L93 Difference]: Finished difference Result 203 states and 242 transitions. [2021-05-02 12:55:30,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 12:55:30,881 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 21 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 42 [2021-05-02 12:55:30,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:55:30,881 INFO L225 Difference]: With dead ends: 203 [2021-05-02 12:55:30,882 INFO L226 Difference]: Without dead ends: 185 [2021-05-02 12:55:30,882 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 1135.8ms TimeCoverageRelationStatistics Valid=182, Invalid=1980, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 12:55:30,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-05-02 12:55:30,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 171. [2021-05-02 12:55:30,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 166 states have (on average 1.2409638554216869) internal successors, (206), 166 states have internal predecessors, (206), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:30,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 210 transitions. [2021-05-02 12:55:30,898 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 210 transitions. Word has length 42 [2021-05-02 12:55:30,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:55:30,898 INFO L480 AbstractCegarLoop]: Abstraction has 171 states and 210 transitions. [2021-05-02 12:55:30,898 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 21 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 12:55:30,898 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 210 transitions. [2021-05-02 12:55:30,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 12:55:30,899 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:55:30,899 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:55:31,099 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable94,84 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:31,100 INFO L428 AbstractCegarLoop]: === Iteration 87 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:55:31,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:55:31,100 INFO L82 PathProgramCache]: Analyzing trace with hash -2101683985, now seen corresponding path program 78 times [2021-05-02 12:55:31,100 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:55:31,100 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1432332710] [2021-05-02 12:55:31,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:55:31,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:31,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:55:31,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:31,487 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 12:55:31,487 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:55:31,487 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1432332710] [2021-05-02 12:55:31,488 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1432332710] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:31,488 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1902710535] [2021-05-02 12:55:31,488 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:31,708 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-05-02 12:55:31,708 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:55:31,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 62 conjunts are in the unsatisfiable core [2021-05-02 12:55:31,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:55:32,042 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 12:55:32,042 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1902710535] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:32,042 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:55:32,042 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 34 [2021-05-02 12:55:32,042 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895033288] [2021-05-02 12:55:32,042 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 12:55:32,042 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:55:32,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 12:55:32,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=1019, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 12:55:32,043 INFO L87 Difference]: Start difference. First operand 171 states and 210 transitions. Second operand has 34 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 33 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:33,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:55:33,195 INFO L93 Difference]: Finished difference Result 200 states and 239 transitions. [2021-05-02 12:55:33,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 12:55:33,196 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 33 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2021-05-02 12:55:33,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:55:33,197 INFO L225 Difference]: With dead ends: 200 [2021-05-02 12:55:33,197 INFO L226 Difference]: Without dead ends: 184 [2021-05-02 12:55:33,197 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 456 ImplicationChecksByTransitivity, 1260.7ms TimeCoverageRelationStatistics Valid=226, Invalid=2744, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 12:55:33,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2021-05-02 12:55:33,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 172. [2021-05-02 12:55:33,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 167 states have (on average 1.2395209580838322) internal successors, (207), 167 states have internal predecessors, (207), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:33,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 211 transitions. [2021-05-02 12:55:33,213 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 211 transitions. Word has length 43 [2021-05-02 12:55:33,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:55:33,213 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 211 transitions. [2021-05-02 12:55:33,213 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 33 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:33,213 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 211 transitions. [2021-05-02 12:55:33,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 12:55:33,213 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:55:33,213 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:55:33,413 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable95 [2021-05-02 12:55:33,414 INFO L428 AbstractCegarLoop]: === Iteration 88 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:55:33,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:55:33,414 INFO L82 PathProgramCache]: Analyzing trace with hash 396811007, now seen corresponding path program 79 times [2021-05-02 12:55:33,414 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:55:33,414 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [830817374] [2021-05-02 12:55:33,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:55:33,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:33,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:55:33,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:33,726 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 0 proven. 94 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 12:55:33,726 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:55:33,726 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [830817374] [2021-05-02 12:55:33,726 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [830817374] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:33,726 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [978126288] [2021-05-02 12:55:33,727 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:33,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:33,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 12:55:33,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:55:33,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:33,877 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 0 proven. 94 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 12:55:33,877 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [978126288] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:33,877 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:55:33,877 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-02 12:55:33,878 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [87869423] [2021-05-02 12:55:33,878 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 12:55:33,878 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:55:33,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 12:55:33,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=499, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:55:33,879 INFO L87 Difference]: Start difference. First operand 172 states and 211 transitions. Second operand has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 23 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:35,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:55:35,152 INFO L93 Difference]: Finished difference Result 203 states and 242 transitions. [2021-05-02 12:55:35,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 12:55:35,152 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 23 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2021-05-02 12:55:35,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:55:35,153 INFO L225 Difference]: With dead ends: 203 [2021-05-02 12:55:35,153 INFO L226 Difference]: Without dead ends: 186 [2021-05-02 12:55:35,153 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 1128.4ms TimeCoverageRelationStatistics Valid=206, Invalid=2344, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 12:55:35,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2021-05-02 12:55:35,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 173. [2021-05-02 12:55:35,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 168 states have (on average 1.2380952380952381) internal successors, (208), 168 states have internal predecessors, (208), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:35,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 212 transitions. [2021-05-02 12:55:35,173 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 212 transitions. Word has length 43 [2021-05-02 12:55:35,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:55:35,173 INFO L480 AbstractCegarLoop]: Abstraction has 173 states and 212 transitions. [2021-05-02 12:55:35,173 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 23 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:35,174 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 212 transitions. [2021-05-02 12:55:35,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 12:55:35,174 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:55:35,174 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:55:35,374 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable96,86 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:35,375 INFO L428 AbstractCegarLoop]: === Iteration 89 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:55:35,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:55:35,375 INFO L82 PathProgramCache]: Analyzing trace with hash -1247400145, now seen corresponding path program 80 times [2021-05-02 12:55:35,375 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:55:35,375 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2041508008] [2021-05-02 12:55:35,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:55:35,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:35,714 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:55:35,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:35,716 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-05-02 12:55:35,716 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:55:35,716 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2041508008] [2021-05-02 12:55:35,716 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2041508008] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:35,716 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [617218754] [2021-05-02 12:55:35,717 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 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:35,769 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:55:35,769 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:55:35,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 12:55:35,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:55:35,851 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:35,875 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-05-02 12:55:35,875 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [617218754] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:35,875 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:55:35,875 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 12:55:35,875 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1550602696] [2021-05-02 12:55:35,876 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 12:55:35,876 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:55:35,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 12:55:35,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=457, Unknown=0, NotChecked=0, Total=506 [2021-05-02 12:55:35,876 INFO L87 Difference]: Start difference. First operand 173 states and 212 transitions. Second operand has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 22 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:37,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:55:37,280 INFO L93 Difference]: Finished difference Result 206 states and 245 transitions. [2021-05-02 12:55:37,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 12:55:37,280 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 22 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2021-05-02 12:55:37,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:55:37,281 INFO L225 Difference]: With dead ends: 206 [2021-05-02 12:55:37,281 INFO L226 Difference]: Without dead ends: 188 [2021-05-02 12:55:37,282 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 378 ImplicationChecksByTransitivity, 1183.5ms TimeCoverageRelationStatistics Valid=206, Invalid=2344, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 12:55:37,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-05-02 12:55:37,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 174. [2021-05-02 12:55:37,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 169 states have (on average 1.2366863905325445) internal successors, (209), 169 states have internal predecessors, (209), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:37,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 213 transitions. [2021-05-02 12:55:37,298 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 213 transitions. Word has length 43 [2021-05-02 12:55:37,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:55:37,298 INFO L480 AbstractCegarLoop]: Abstraction has 174 states and 213 transitions. [2021-05-02 12:55:37,298 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 22 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:37,299 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 213 transitions. [2021-05-02 12:55:37,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 12:55:37,299 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:55:37,299 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:55:37,501 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable97 [2021-05-02 12:55:37,501 INFO L428 AbstractCegarLoop]: === Iteration 90 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:55:37,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:55:37,501 INFO L82 PathProgramCache]: Analyzing trace with hash -1705851713, now seen corresponding path program 81 times [2021-05-02 12:55:37,501 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:55:37,502 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1099572856] [2021-05-02 12:55:37,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:55:37,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:37,793 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:55:37,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:37,796 INFO L134 CoverageAnalysis]: Checked inductivity of 188 backedges. 0 proven. 97 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 12:55:37,796 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:55:37,796 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1099572856] [2021-05-02 12:55:37,796 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1099572856] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:37,796 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [628001417] [2021-05-02 12:55:37,796 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 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:37,901 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 12:55:37,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:55:37,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 12:55:37,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:55:38,215 INFO L134 CoverageAnalysis]: Checked inductivity of 188 backedges. 40 proven. 12 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-05-02 12:55:38,215 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [628001417] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:38,215 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:55:38,215 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 10] total 29 [2021-05-02 12:55:38,216 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2061729518] [2021-05-02 12:55:38,216 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 12:55:38,216 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:55:38,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 12:55:38,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=750, Unknown=0, NotChecked=0, Total=812 [2021-05-02 12:55:38,216 INFO L87 Difference]: Start difference. First operand 174 states and 213 transitions. Second operand has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 28 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:40,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:55:40,441 INFO L93 Difference]: Finished difference Result 245 states and 291 transitions. [2021-05-02 12:55:40,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-02 12:55:40,442 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 28 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2021-05-02 12:55:40,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:55:40,443 INFO L225 Difference]: With dead ends: 245 [2021-05-02 12:55:40,443 INFO L226 Difference]: Without dead ends: 195 [2021-05-02 12:55:40,443 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 736 ImplicationChecksByTransitivity, 2006.3ms TimeCoverageRelationStatistics Valid=296, Invalid=4260, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 12:55:40,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2021-05-02 12:55:40,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 180. [2021-05-02 12:55:40,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 175 states have (on average 1.2228571428571429) internal successors, (214), 175 states have internal predecessors, (214), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:40,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 218 transitions. [2021-05-02 12:55:40,466 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 218 transitions. Word has length 43 [2021-05-02 12:55:40,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:55:40,466 INFO L480 AbstractCegarLoop]: Abstraction has 180 states and 218 transitions. [2021-05-02 12:55:40,466 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 28 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:40,466 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 218 transitions. [2021-05-02 12:55:40,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 12:55:40,466 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:55:40,466 INFO L523 BasicCegarLoop]: trace histogram [22, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:55:40,667 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 88 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable98 [2021-05-02 12:55:40,667 INFO L428 AbstractCegarLoop]: === Iteration 91 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:55:40,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:55:40,667 INFO L82 PathProgramCache]: Analyzing trace with hash 1843038848, now seen corresponding path program 82 times [2021-05-02 12:55:40,667 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:55:40,667 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1514760678] [2021-05-02 12:55:40,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:55:40,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:41,190 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:55:41,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:41,192 INFO L134 CoverageAnalysis]: Checked inductivity of 269 backedges. 0 proven. 263 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 12:55:41,192 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:55:41,192 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1514760678] [2021-05-02 12:55:41,192 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1514760678] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:41,192 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1159759058] [2021-05-02 12:55:41,192 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 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:41,240 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:55:41,240 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:55:41,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 57 conjunts are in the unsatisfiable core [2021-05-02 12:55:41,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:55:41,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:41,422 INFO L134 CoverageAnalysis]: Checked inductivity of 269 backedges. 0 proven. 263 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 12:55:41,422 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1159759058] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:41,422 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:55:41,422 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-02 12:55:41,422 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984124980] [2021-05-02 12:55:41,422 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 12:55:41,422 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:55:41,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 12:55:41,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=926, Unknown=0, NotChecked=0, Total=992 [2021-05-02 12:55:41,423 INFO L87 Difference]: Start difference. First operand 180 states and 218 transitions. Second operand has 32 states, 32 states have (on average 1.25) internal successors, (40), 31 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:44,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:55:44,174 INFO L93 Difference]: Finished difference Result 268 states and 355 transitions. [2021-05-02 12:55:44,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 12:55:44,175 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.25) internal successors, (40), 31 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2021-05-02 12:55:44,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:55:44,176 INFO L225 Difference]: With dead ends: 268 [2021-05-02 12:55:44,176 INFO L226 Difference]: Without dead ends: 257 [2021-05-02 12:55:44,176 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 713 ImplicationChecksByTransitivity, 1834.1ms TimeCoverageRelationStatistics Valid=263, Invalid=4567, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 12:55:44,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2021-05-02 12:55:44,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 189. [2021-05-02 12:55:44,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 184 states have (on average 1.2228260869565217) internal successors, (225), 184 states have internal predecessors, (225), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:44,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 229 transitions. [2021-05-02 12:55:44,195 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 229 transitions. Word has length 43 [2021-05-02 12:55:44,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:55:44,195 INFO L480 AbstractCegarLoop]: Abstraction has 189 states and 229 transitions. [2021-05-02 12:55:44,196 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.25) internal successors, (40), 31 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:44,196 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 229 transitions. [2021-05-02 12:55:44,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 12:55:44,196 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:55:44,196 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:55:44,396 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable99,89 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:44,396 INFO L428 AbstractCegarLoop]: === Iteration 92 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:55:44,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:55:44,397 INFO L82 PathProgramCache]: Analyzing trace with hash 60430093, now seen corresponding path program 83 times [2021-05-02 12:55:44,397 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:55:44,397 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [629974487] [2021-05-02 12:55:44,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:55:44,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:44,610 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:55:44,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:44,612 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 12:55:44,612 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:55:44,612 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [629974487] [2021-05-02 12:55:44,612 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [629974487] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:44,612 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [683669070] [2021-05-02 12:55:44,612 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 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:47,796 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 12:55:47,797 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:55:47,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 69 conjunts are in the unsatisfiable core [2021-05-02 12:55:47,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:55:47,862 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:47,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:47,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:47,931 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 12:55:47,931 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [683669070] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:47,932 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:55:47,932 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 18 [2021-05-02 12:55:47,932 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1175339202] [2021-05-02 12:55:47,932 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 12:55:47,932 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:55:47,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 12:55:47,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=271, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:55:47,932 INFO L87 Difference]: Start difference. First operand 189 states and 229 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 15 states have internal predecessors, (34), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:48,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:55:48,746 INFO L93 Difference]: Finished difference Result 475 states and 601 transitions. [2021-05-02 12:55:48,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 12:55:48,746 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 15 states have internal predecessors, (34), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2021-05-02 12:55:48,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:55:48,747 INFO L225 Difference]: With dead ends: 475 [2021-05-02 12:55:48,747 INFO L226 Difference]: Without dead ends: 459 [2021-05-02 12:55:48,748 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 52 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 567.4ms TimeCoverageRelationStatistics Valid=92, Invalid=838, Unknown=0, NotChecked=0, Total=930 [2021-05-02 12:55:48,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 459 states. [2021-05-02 12:55:48,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 459 to 195. [2021-05-02 12:55:48,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 190 states have (on average 1.2263157894736842) internal successors, (233), 190 states have internal predecessors, (233), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:48,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 237 transitions. [2021-05-02 12:55:48,769 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 237 transitions. Word has length 44 [2021-05-02 12:55:48,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:55:48,769 INFO L480 AbstractCegarLoop]: Abstraction has 195 states and 237 transitions. [2021-05-02 12:55:48,769 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 15 states have internal predecessors, (34), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:48,769 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 237 transitions. [2021-05-02 12:55:48,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 12:55:48,769 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:55:48,770 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:55:48,970 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable100,90 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:48,970 INFO L428 AbstractCegarLoop]: === Iteration 93 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:55:48,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:55:48,970 INFO L82 PathProgramCache]: Analyzing trace with hash 1338400127, now seen corresponding path program 84 times [2021-05-02 12:55:48,970 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:55:48,971 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [189071266] [2021-05-02 12:55:48,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:55:48,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:49,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:55:49,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:49,315 INFO L134 CoverageAnalysis]: Checked inductivity of 168 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 12:55:49,315 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:55:49,315 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [189071266] [2021-05-02 12:55:49,315 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [189071266] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:49,315 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1986878927] [2021-05-02 12:55:49,315 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 91 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 91 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:49,705 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 12:55:49,705 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:55:49,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 47 conjunts are in the unsatisfiable core [2021-05-02 12:55:49,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:55:49,813 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:49,830 INFO L134 CoverageAnalysis]: Checked inductivity of 168 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 12:55:49,831 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1986878927] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:49,831 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:55:49,831 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 12:55:49,831 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927938026] [2021-05-02 12:55:49,831 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 12:55:49,831 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:55:49,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 12:55:49,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=544, Unknown=0, NotChecked=0, Total=600 [2021-05-02 12:55:49,831 INFO L87 Difference]: Start difference. First operand 195 states and 237 transitions. Second operand has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:51,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:55:51,266 INFO L93 Difference]: Finished difference Result 226 states and 268 transitions. [2021-05-02 12:55:51,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 12:55:51,267 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2021-05-02 12:55:51,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:55:51,268 INFO L225 Difference]: With dead ends: 226 [2021-05-02 12:55:51,268 INFO L226 Difference]: Without dead ends: 209 [2021-05-02 12:55:51,268 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 42 SyntacticMatches, 3 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 407 ImplicationChecksByTransitivity, 1266.4ms TimeCoverageRelationStatistics Valid=223, Invalid=2639, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 12:55:51,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-05-02 12:55:51,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 196. [2021-05-02 12:55:51,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 191 states have (on average 1.225130890052356) internal successors, (234), 191 states have internal predecessors, (234), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:51,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 238 transitions. [2021-05-02 12:55:51,289 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 238 transitions. Word has length 44 [2021-05-02 12:55:51,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:55:51,289 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 238 transitions. [2021-05-02 12:55:51,289 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:51,289 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 238 transitions. [2021-05-02 12:55:51,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 12:55:51,289 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:55:51,289 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:55:51,492 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 91 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable102 [2021-05-02 12:55:51,493 INFO L428 AbstractCegarLoop]: === Iteration 94 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:55:51,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:55:51,493 INFO L82 PathProgramCache]: Analyzing trace with hash -1592108787, now seen corresponding path program 85 times [2021-05-02 12:55:51,493 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:55:51,493 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [512446381] [2021-05-02 12:55:51,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:55:51,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:51,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:55:51,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:51,830 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-05-02 12:55:51,831 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:55:51,831 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [512446381] [2021-05-02 12:55:51,831 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [512446381] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:51,831 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1025143116] [2021-05-02 12:55:51,831 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:51,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:51,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 12:55:51,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:55:51,980 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:52,000 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-05-02 12:55:52,000 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1025143116] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:52,000 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:55:52,000 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-02 12:55:52,001 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464695822] [2021-05-02 12:55:52,001 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 12:55:52,001 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:55:52,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 12:55:52,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=500, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:55:52,001 INFO L87 Difference]: Start difference. First operand 196 states and 238 transitions. Second operand has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 23 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:53,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:55:53,603 INFO L93 Difference]: Finished difference Result 229 states and 271 transitions. [2021-05-02 12:55:53,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 12:55:53,603 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 23 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2021-05-02 12:55:53,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:55:53,604 INFO L225 Difference]: With dead ends: 229 [2021-05-02 12:55:53,604 INFO L226 Difference]: Without dead ends: 211 [2021-05-02 12:55:53,604 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 462 ImplicationChecksByTransitivity, 1275.2ms TimeCoverageRelationStatistics Valid=230, Invalid=2740, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 12:55:53,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2021-05-02 12:55:53,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 197. [2021-05-02 12:55:53,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 192 states have (on average 1.2239583333333333) internal successors, (235), 192 states have internal predecessors, (235), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:53,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 239 transitions. [2021-05-02 12:55:53,625 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 239 transitions. Word has length 44 [2021-05-02 12:55:53,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:55:53,625 INFO L480 AbstractCegarLoop]: Abstraction has 197 states and 239 transitions. [2021-05-02 12:55:53,625 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 23 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:53,625 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 239 transitions. [2021-05-02 12:55:53,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 12:55:53,626 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:55:53,626 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:55:53,826 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 92 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable103 [2021-05-02 12:55:53,826 INFO L428 AbstractCegarLoop]: === Iteration 95 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:55:53,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:55:53,827 INFO L82 PathProgramCache]: Analyzing trace with hash 263250815, now seen corresponding path program 86 times [2021-05-02 12:55:53,827 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:55:53,827 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [376343135] [2021-05-02 12:55:53,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:55:53,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:54,124 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:55:54,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:54,126 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 0 proven. 101 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 12:55:54,126 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:55:54,126 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [376343135] [2021-05-02 12:55:54,126 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [376343135] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:54,126 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1999106278] [2021-05-02 12:55:54,126 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 93 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 93 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:54,177 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:55:54,177 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:55:54,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 12:55:54,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:55:54,258 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:55:54,286 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 0 proven. 101 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 12:55:54,286 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1999106278] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:54,286 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:55:54,286 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 12:55:54,286 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252151292] [2021-05-02 12:55:54,286 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 12:55:54,287 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:55:54,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 12:55:54,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=458, Unknown=0, NotChecked=0, Total=506 [2021-05-02 12:55:54,287 INFO L87 Difference]: Start difference. First operand 197 states and 239 transitions. Second operand has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 22 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:55,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:55:55,735 INFO L93 Difference]: Finished difference Result 232 states and 274 transitions. [2021-05-02 12:55:55,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 12:55:55,735 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 22 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2021-05-02 12:55:55,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:55:55,736 INFO L225 Difference]: With dead ends: 232 [2021-05-02 12:55:55,736 INFO L226 Difference]: Without dead ends: 213 [2021-05-02 12:55:55,737 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 1165.4ms TimeCoverageRelationStatistics Valid=202, Invalid=2348, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 12:55:55,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2021-05-02 12:55:55,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 198. [2021-05-02 12:55:55,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 193 states have (on average 1.2227979274611398) internal successors, (236), 193 states have internal predecessors, (236), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:55,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 240 transitions. [2021-05-02 12:55:55,758 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 240 transitions. Word has length 44 [2021-05-02 12:55:55,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:55:55,758 INFO L480 AbstractCegarLoop]: Abstraction has 198 states and 240 transitions. [2021-05-02 12:55:55,758 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 22 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:55:55,758 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 240 transitions. [2021-05-02 12:55:55,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 12:55:55,758 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:55:55,758 INFO L523 BasicCegarLoop]: trace histogram [23, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:55:55,959 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable104,93 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:55,959 INFO L428 AbstractCegarLoop]: === Iteration 96 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:55:55,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:55:55,959 INFO L82 PathProgramCache]: Analyzing trace with hash 1741784767, now seen corresponding path program 87 times [2021-05-02 12:55:55,959 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:55:55,960 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [513430145] [2021-05-02 12:55:55,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:55:55,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:56,514 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:55:56,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:55:56,516 INFO L134 CoverageAnalysis]: Checked inductivity of 292 backedges. 0 proven. 286 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 12:55:56,517 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:55:56,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [513430145] [2021-05-02 12:55:56,517 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [513430145] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:56,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [760736335] [2021-05-02 12:55:56,517 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 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:55:56,628 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 12:55:56,628 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:55:56,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 12:55:56,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:55:56,958 INFO L134 CoverageAnalysis]: Checked inductivity of 292 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2021-05-02 12:55:56,959 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [760736335] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:55:56,959 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:55:56,959 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 10] total 40 [2021-05-02 12:55:56,959 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002589735] [2021-05-02 12:55:56,959 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-02 12:55:56,959 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:55:56,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-02 12:55:56,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=1387, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 12:55:56,960 INFO L87 Difference]: Start difference. First operand 198 states and 240 transitions. Second operand has 40 states, 40 states have (on average 1.3) internal successors, (52), 39 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:04,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:04,340 INFO L93 Difference]: Finished difference Result 325 states and 436 transitions. [2021-05-02 12:56:04,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2021-05-02 12:56:04,341 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.3) internal successors, (52), 39 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2021-05-02 12:56:04,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:04,342 INFO L225 Difference]: With dead ends: 325 [2021-05-02 12:56:04,342 INFO L226 Difference]: Without dead ends: 314 [2021-05-02 12:56:04,343 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5490 ImplicationChecksByTransitivity, 5828.2ms TimeCoverageRelationStatistics Valid=1915, Invalid=18107, Unknown=0, NotChecked=0, Total=20022 [2021-05-02 12:56:04,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2021-05-02 12:56:04,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 211. [2021-05-02 12:56:04,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 206 states have (on average 1.2135922330097086) internal successors, (250), 206 states have internal predecessors, (250), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:04,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 254 transitions. [2021-05-02 12:56:04,365 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 254 transitions. Word has length 44 [2021-05-02 12:56:04,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:04,366 INFO L480 AbstractCegarLoop]: Abstraction has 211 states and 254 transitions. [2021-05-02 12:56:04,366 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 1.3) internal successors, (52), 39 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:04,366 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 254 transitions. [2021-05-02 12:56:04,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 12:56:04,366 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:04,366 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:04,566 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 94 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable105 [2021-05-02 12:56:04,567 INFO L428 AbstractCegarLoop]: === Iteration 97 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:04,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:04,567 INFO L82 PathProgramCache]: Analyzing trace with hash -1633510225, now seen corresponding path program 88 times [2021-05-02 12:56:04,567 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:04,567 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1134196657] [2021-05-02 12:56:04,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:04,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:04,935 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:04,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:04,937 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 12:56:04,937 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:04,937 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1134196657] [2021-05-02 12:56:04,938 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1134196657] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:04,938 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [789459361] [2021-05-02 12:56:04,938 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 95 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 95 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:04,987 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:56:04,987 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:56:04,988 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 66 conjunts are in the unsatisfiable core [2021-05-02 12:56:04,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:05,410 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 12:56:05,410 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [789459361] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:05,410 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:05,410 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 36 [2021-05-02 12:56:05,410 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890485625] [2021-05-02 12:56:05,411 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 12:56:05,411 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:05,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 12:56:05,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=1169, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 12:56:05,411 INFO L87 Difference]: Start difference. First operand 211 states and 254 transitions. Second operand has 36 states, 36 states have (on average 1.25) internal successors, (45), 35 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:06,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:06,570 INFO L93 Difference]: Finished difference Result 227 states and 269 transitions. [2021-05-02 12:56:06,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 12:56:06,570 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.25) internal successors, (45), 35 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2021-05-02 12:56:06,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:06,571 INFO L225 Difference]: With dead ends: 227 [2021-05-02 12:56:06,571 INFO L226 Difference]: Without dead ends: 198 [2021-05-02 12:56:06,571 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 1366.0ms TimeCoverageRelationStatistics Valid=212, Invalid=3094, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 12:56:06,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-05-02 12:56:06,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 198. [2021-05-02 12:56:06,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 193 states have (on average 1.217616580310881) internal successors, (235), 193 states have internal predecessors, (235), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:06,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 239 transitions. [2021-05-02 12:56:06,591 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 239 transitions. Word has length 45 [2021-05-02 12:56:06,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:06,591 INFO L480 AbstractCegarLoop]: Abstraction has 198 states and 239 transitions. [2021-05-02 12:56:06,591 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 1.25) internal successors, (45), 35 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:06,591 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 239 transitions. [2021-05-02 12:56:06,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 12:56:06,591 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:06,591 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:06,792 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable106,95 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:06,792 INFO L428 AbstractCegarLoop]: === Iteration 98 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:06,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:06,792 INFO L82 PathProgramCache]: Analyzing trace with hash 462891775, now seen corresponding path program 89 times [2021-05-02 12:56:06,793 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:06,793 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1382143198] [2021-05-02 12:56:06,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:06,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:07,189 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:07,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:07,191 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 111 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 12:56:07,191 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:07,191 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1382143198] [2021-05-02 12:56:07,191 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1382143198] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:07,191 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [193139886] [2021-05-02 12:56:07,191 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 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:10,286 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-05-02 12:56:10,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:56:10,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 64 conjunts are in the unsatisfiable core [2021-05-02 12:56:10,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:10,655 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 111 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 12:56:10,655 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [193139886] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:10,655 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:10,655 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 35 [2021-05-02 12:56:10,655 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [751217783] [2021-05-02 12:56:10,656 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 12:56:10,656 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:10,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 12:56:10,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1085, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 12:56:10,656 INFO L87 Difference]: Start difference. First operand 198 states and 239 transitions. Second operand has 35 states, 35 states have (on average 1.2285714285714286) internal successors, (43), 34 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:11,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:11,951 INFO L93 Difference]: Finished difference Result 229 states and 270 transitions. [2021-05-02 12:56:11,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 12:56:11,951 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.2285714285714286) internal successors, (43), 34 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2021-05-02 12:56:11,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:11,952 INFO L225 Difference]: With dead ends: 229 [2021-05-02 12:56:11,952 INFO L226 Difference]: Without dead ends: 212 [2021-05-02 12:56:11,953 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 487 ImplicationChecksByTransitivity, 1324.9ms TimeCoverageRelationStatistics Valid=232, Invalid=2960, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 12:56:11,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-05-02 12:56:11,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 199. [2021-05-02 12:56:11,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 194 states have (on average 1.2164948453608246) internal successors, (236), 194 states have internal predecessors, (236), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:11,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 240 transitions. [2021-05-02 12:56:11,972 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 240 transitions. Word has length 45 [2021-05-02 12:56:11,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:11,973 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 240 transitions. [2021-05-02 12:56:11,973 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.2285714285714286) internal successors, (43), 34 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:11,973 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 240 transitions. [2021-05-02 12:56:11,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 12:56:11,973 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:11,973 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:12,173 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 96 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable107 [2021-05-02 12:56:12,174 INFO L428 AbstractCegarLoop]: === Iteration 99 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:12,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:12,174 INFO L82 PathProgramCache]: Analyzing trace with hash 606825199, now seen corresponding path program 90 times [2021-05-02 12:56:12,174 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:12,174 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1622165099] [2021-05-02 12:56:12,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:12,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:12,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:12,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:12,559 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 0 proven. 106 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-05-02 12:56:12,559 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:12,559 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1622165099] [2021-05-02 12:56:12,559 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1622165099] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:12,559 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [50382361] [2021-05-02 12:56:12,559 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 97 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 97 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:13,106 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 12:56:13,106 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:56:13,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 52 conjunts are in the unsatisfiable core [2021-05-02 12:56:13,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:13,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:13,120 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:13,125 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:13,126 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:13,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:13,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:13,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:13,149 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:13,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:13,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:13,253 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:13,272 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 0 proven. 106 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-05-02 12:56:13,272 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [50382361] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:13,272 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:13,272 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 12:56:13,272 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238727997] [2021-05-02 12:56:13,272 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 12:56:13,272 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:13,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 12:56:13,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=545, Unknown=0, NotChecked=0, Total=600 [2021-05-02 12:56:13,273 INFO L87 Difference]: Start difference. First operand 199 states and 240 transitions. Second operand has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:14,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:14,751 INFO L93 Difference]: Finished difference Result 232 states and 273 transitions. [2021-05-02 12:56:14,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 12:56:14,752 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2021-05-02 12:56:14,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:14,752 INFO L225 Difference]: With dead ends: 232 [2021-05-02 12:56:14,753 INFO L226 Difference]: Without dead ends: 214 [2021-05-02 12:56:14,753 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 43 SyntacticMatches, 3 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 382 ImplicationChecksByTransitivity, 1299.6ms TimeCoverageRelationStatistics Valid=212, Invalid=2544, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 12:56:14,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2021-05-02 12:56:14,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 200. [2021-05-02 12:56:14,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 195 states have (on average 1.2153846153846153) internal successors, (237), 195 states have internal predecessors, (237), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:14,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 241 transitions. [2021-05-02 12:56:14,789 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 241 transitions. Word has length 45 [2021-05-02 12:56:14,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:14,790 INFO L480 AbstractCegarLoop]: Abstraction has 200 states and 241 transitions. [2021-05-02 12:56:14,790 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:14,790 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 241 transitions. [2021-05-02 12:56:14,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 12:56:14,790 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:14,790 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:14,994 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 97 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable108 [2021-05-02 12:56:14,994 INFO L428 AbstractCegarLoop]: === Iteration 100 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:14,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:14,994 INFO L82 PathProgramCache]: Analyzing trace with hash 1175887039, now seen corresponding path program 91 times [2021-05-02 12:56:14,994 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:14,994 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [499023984] [2021-05-02 12:56:14,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:15,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:15,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:15,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:15,309 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 0 proven. 106 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 12:56:15,309 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:15,309 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [499023984] [2021-05-02 12:56:15,309 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [499023984] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:15,309 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1593191618] [2021-05-02 12:56:15,309 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:15,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:15,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 12:56:15,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:15,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:15,448 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 0 proven. 106 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 12:56:15,449 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1593191618] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:15,449 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:15,449 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-02 12:56:15,449 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [711894172] [2021-05-02 12:56:15,449 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 12:56:15,449 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:15,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 12:56:15,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=501, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:56:15,449 INFO L87 Difference]: Start difference. First operand 200 states and 241 transitions. Second operand has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 23 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:16,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:16,915 INFO L93 Difference]: Finished difference Result 235 states and 276 transitions. [2021-05-02 12:56:16,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 12:56:16,916 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 23 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2021-05-02 12:56:16,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:16,916 INFO L225 Difference]: With dead ends: 235 [2021-05-02 12:56:16,917 INFO L226 Difference]: Without dead ends: 216 [2021-05-02 12:56:16,917 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 407 ImplicationChecksByTransitivity, 1197.5ms TimeCoverageRelationStatistics Valid=212, Invalid=2544, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 12:56:16,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2021-05-02 12:56:16,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 201. [2021-05-02 12:56:16,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 196 states have (on average 1.2142857142857142) internal successors, (238), 196 states have internal predecessors, (238), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:16,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 242 transitions. [2021-05-02 12:56:16,939 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 242 transitions. Word has length 45 [2021-05-02 12:56:16,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:16,940 INFO L480 AbstractCegarLoop]: Abstraction has 201 states and 242 transitions. [2021-05-02 12:56:16,940 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 23 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:16,940 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 242 transitions. [2021-05-02 12:56:16,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 12:56:16,940 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:16,940 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:17,144 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable109,98 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:17,145 INFO L428 AbstractCegarLoop]: === Iteration 101 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:17,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:17,145 INFO L82 PathProgramCache]: Analyzing trace with hash -908063361, now seen corresponding path program 92 times [2021-05-02 12:56:17,145 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:17,145 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [95678609] [2021-05-02 12:56:17,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:17,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:17,558 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:17,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:17,561 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 12:56:17,561 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:17,561 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [95678609] [2021-05-02 12:56:17,561 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [95678609] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:17,561 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2053229755] [2021-05-02 12:56:17,561 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 99 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 99 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:17,611 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:56:17,611 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:56:17,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 68 conjunts are in the unsatisfiable core [2021-05-02 12:56:17,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:18,009 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 12:56:18,009 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2053229755] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:18,009 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:18,009 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 37 [2021-05-02 12:56:18,009 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632264711] [2021-05-02 12:56:18,009 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 12:56:18,009 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:18,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 12:56:18,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1219, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 12:56:18,010 INFO L87 Difference]: Start difference. First operand 201 states and 242 transitions. Second operand has 37 states, 37 states have (on average 1.2162162162162162) internal successors, (45), 36 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:19,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:19,362 INFO L93 Difference]: Finished difference Result 232 states and 273 transitions. [2021-05-02 12:56:19,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 12:56:19,362 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.2162162162162162) internal successors, (45), 36 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2021-05-02 12:56:19,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:19,363 INFO L225 Difference]: With dead ends: 232 [2021-05-02 12:56:19,364 INFO L226 Difference]: Without dead ends: 215 [2021-05-02 12:56:19,364 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 551 ImplicationChecksByTransitivity, 1435.7ms TimeCoverageRelationStatistics Valid=248, Invalid=3292, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 12:56:19,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2021-05-02 12:56:19,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 202. [2021-05-02 12:56:19,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 197 states have (on average 1.2131979695431472) internal successors, (239), 197 states have internal predecessors, (239), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:19,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 243 transitions. [2021-05-02 12:56:19,386 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 243 transitions. Word has length 46 [2021-05-02 12:56:19,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:19,387 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 243 transitions. [2021-05-02 12:56:19,387 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 1.2162162162162162) internal successors, (45), 36 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:19,387 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 243 transitions. [2021-05-02 12:56:19,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 12:56:19,387 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:19,387 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:19,588 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable110,99 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:19,588 INFO L428 AbstractCegarLoop]: === Iteration 102 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:19,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:19,588 INFO L82 PathProgramCache]: Analyzing trace with hash 54302029, now seen corresponding path program 93 times [2021-05-02 12:56:19,588 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:19,588 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [744876663] [2021-05-02 12:56:19,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:19,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:19,960 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:19,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:19,963 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 0 proven. 114 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-05-02 12:56:19,963 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:19,963 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [744876663] [2021-05-02 12:56:19,963 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [744876663] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:19,963 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1621936493] [2021-05-02 12:56:19,963 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 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:20,640 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-05-02 12:56:20,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:56:20,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 52 conjunts are in the unsatisfiable core [2021-05-02 12:56:20,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:20,656 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:20,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:20,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:20,684 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:20,770 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:20,789 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 0 proven. 114 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-05-02 12:56:20,790 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1621936493] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:20,790 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:20,790 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-02 12:56:20,790 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897553985] [2021-05-02 12:56:20,790 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 12:56:20,790 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:20,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 12:56:20,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=592, Unknown=0, NotChecked=0, Total=650 [2021-05-02 12:56:20,790 INFO L87 Difference]: Start difference. First operand 202 states and 243 transitions. Second operand has 26 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 25 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 12:56:22,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:22,399 INFO L93 Difference]: Finished difference Result 235 states and 276 transitions. [2021-05-02 12:56:22,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 12:56:22,399 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 25 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 46 [2021-05-02 12:56:22,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:22,400 INFO L225 Difference]: With dead ends: 235 [2021-05-02 12:56:22,400 INFO L226 Difference]: Without dead ends: 217 [2021-05-02 12:56:22,400 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 44 SyntacticMatches, 3 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 437 ImplicationChecksByTransitivity, 1365.4ms TimeCoverageRelationStatistics Valid=229, Invalid=2851, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 12:56:22,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2021-05-02 12:56:22,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 203. [2021-05-02 12:56:22,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 198 states have (on average 1.2121212121212122) internal successors, (240), 198 states have internal predecessors, (240), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:22,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 244 transitions. [2021-05-02 12:56:22,431 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 244 transitions. Word has length 46 [2021-05-02 12:56:22,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:22,431 INFO L480 AbstractCegarLoop]: Abstraction has 203 states and 244 transitions. [2021-05-02 12:56:22,431 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 25 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 12:56:22,431 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 244 transitions. [2021-05-02 12:56:22,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 12:56:22,432 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:22,432 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:22,636 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 100 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable111 [2021-05-02 12:56:22,636 INFO L428 AbstractCegarLoop]: === Iteration 103 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:22,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:22,637 INFO L82 PathProgramCache]: Analyzing trace with hash -597161089, now seen corresponding path program 94 times [2021-05-02 12:56:22,637 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:22,637 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1477912079] [2021-05-02 12:56:22,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:22,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:22,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:22,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:22,979 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 0 proven. 112 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 12:56:22,979 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:22,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1477912079] [2021-05-02 12:56:22,979 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1477912079] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:22,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1267250179] [2021-05-02 12:56:22,980 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 101 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 101 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:23,033 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:56:23,033 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:56:23,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 12:56:23,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:23,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:23,154 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 0 proven. 112 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 12:56:23,154 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1267250179] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:23,154 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:23,154 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 12:56:23,155 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146555859] [2021-05-02 12:56:23,155 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 12:56:23,155 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:23,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 12:56:23,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=546, Unknown=0, NotChecked=0, Total=600 [2021-05-02 12:56:23,155 INFO L87 Difference]: Start difference. First operand 203 states and 244 transitions. Second operand has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:24,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:24,815 INFO L93 Difference]: Finished difference Result 238 states and 279 transitions. [2021-05-02 12:56:24,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 12:56:24,816 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2021-05-02 12:56:24,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:24,816 INFO L225 Difference]: With dead ends: 238 [2021-05-02 12:56:24,816 INFO L226 Difference]: Without dead ends: 219 [2021-05-02 12:56:24,817 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 1352.5ms TimeCoverageRelationStatistics Valid=236, Invalid=2956, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 12:56:24,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2021-05-02 12:56:24,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 204. [2021-05-02 12:56:24,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 199 states have (on average 1.2110552763819096) internal successors, (241), 199 states have internal predecessors, (241), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:24,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 245 transitions. [2021-05-02 12:56:24,844 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 245 transitions. Word has length 46 [2021-05-02 12:56:24,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:24,844 INFO L480 AbstractCegarLoop]: Abstraction has 204 states and 245 transitions. [2021-05-02 12:56:24,844 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:24,844 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 245 transitions. [2021-05-02 12:56:24,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 12:56:24,844 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:24,844 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:25,045 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 101 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable112 [2021-05-02 12:56:25,045 INFO L428 AbstractCegarLoop]: === Iteration 104 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:25,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:25,045 INFO L82 PathProgramCache]: Analyzing trace with hash 1084411725, now seen corresponding path program 95 times [2021-05-02 12:56:25,045 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:25,045 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1577483944] [2021-05-02 12:56:25,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:25,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:25,390 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:25,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:25,392 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 0 proven. 115 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-05-02 12:56:25,392 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:25,392 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1577483944] [2021-05-02 12:56:25,392 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1577483944] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:25,392 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [572444317] [2021-05-02 12:56:25,392 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 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:32,911 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-05-02 12:56:32,911 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:56:32,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 50 conjunts are in the unsatisfiable core [2021-05-02 12:56:32,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:33,110 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 0 proven. 115 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-05-02 12:56:33,110 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [572444317] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:33,110 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:33,111 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 28 [2021-05-02 12:56:33,111 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613914971] [2021-05-02 12:56:33,111 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 12:56:33,111 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:33,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 12:56:33,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=685, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:56:33,111 INFO L87 Difference]: Start difference. First operand 204 states and 245 transitions. Second operand has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 27 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:34,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:34,584 INFO L93 Difference]: Finished difference Result 241 states and 282 transitions. [2021-05-02 12:56:34,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 12:56:34,585 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 27 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2021-05-02 12:56:34,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:34,585 INFO L225 Difference]: With dead ends: 241 [2021-05-02 12:56:34,586 INFO L226 Difference]: Without dead ends: 221 [2021-05-02 12:56:34,586 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 548 ImplicationChecksByTransitivity, 1314.3ms TimeCoverageRelationStatistics Valid=236, Invalid=2956, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 12:56:34,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2021-05-02 12:56:34,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 205. [2021-05-02 12:56:34,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 200 states have (on average 1.21) internal successors, (242), 200 states have internal predecessors, (242), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:34,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 246 transitions. [2021-05-02 12:56:34,619 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 246 transitions. Word has length 46 [2021-05-02 12:56:34,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:34,619 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 246 transitions. [2021-05-02 12:56:34,619 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 27 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:34,619 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 246 transitions. [2021-05-02 12:56:34,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 12:56:34,620 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:34,620 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:34,826 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 102 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable113 [2021-05-02 12:56:34,826 INFO L428 AbstractCegarLoop]: === Iteration 105 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:34,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:34,827 INFO L82 PathProgramCache]: Analyzing trace with hash -457999617, now seen corresponding path program 96 times [2021-05-02 12:56:34,827 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:34,827 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1764047286] [2021-05-02 12:56:34,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:34,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:35,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:35,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:35,127 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 12:56:35,127 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:35,127 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1764047286] [2021-05-02 12:56:35,127 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1764047286] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:35,127 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [444103934] [2021-05-02 12:56:35,127 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 103 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 103 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:36,013 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 12:56:36,014 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:56:36,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 78 conjunts are in the unsatisfiable core [2021-05-02 12:56:36,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:36,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,027 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,029 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,030 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,035 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,037 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,039 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,040 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,042 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,043 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,045 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,046 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,050 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,054 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,055 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,059 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,100 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,101 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,105 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,106 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,114 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,120 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,122 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,132 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,134 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,216 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,218 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,222 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,238 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,239 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,241 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:36,303 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 11 proven. 132 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 12:56:36,303 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [444103934] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:36,303 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:36,303 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 19] total 22 [2021-05-02 12:56:36,304 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828397242] [2021-05-02 12:56:36,304 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 12:56:36,304 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:36,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 12:56:36,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:56:36,304 INFO L87 Difference]: Start difference. First operand 205 states and 246 transitions. Second operand has 22 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 19 states have internal predecessors, (41), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:37,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:37,493 INFO L93 Difference]: Finished difference Result 573 states and 722 transitions. [2021-05-02 12:56:37,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 12:56:37,493 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 19 states have internal predecessors, (41), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-05-02 12:56:37,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:37,494 INFO L225 Difference]: With dead ends: 573 [2021-05-02 12:56:37,494 INFO L226 Difference]: Without dead ends: 556 [2021-05-02 12:56:37,495 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 193 ImplicationChecksByTransitivity, 921.3ms TimeCoverageRelationStatistics Valid=164, Invalid=1318, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 12:56:37,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 556 states. [2021-05-02 12:56:37,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 556 to 212. [2021-05-02 12:56:37,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 207 states have (on average 1.21256038647343) internal successors, (251), 207 states have internal predecessors, (251), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:37,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 255 transitions. [2021-05-02 12:56:37,522 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 255 transitions. Word has length 47 [2021-05-02 12:56:37,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:37,522 INFO L480 AbstractCegarLoop]: Abstraction has 212 states and 255 transitions. [2021-05-02 12:56:37,522 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 19 states have internal predecessors, (41), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:37,522 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 255 transitions. [2021-05-02 12:56:37,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 12:56:37,522 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:37,522 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:37,722 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 103 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable114 [2021-05-02 12:56:37,723 INFO L428 AbstractCegarLoop]: === Iteration 106 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:37,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:37,723 INFO L82 PathProgramCache]: Analyzing trace with hash 105952943, now seen corresponding path program 97 times [2021-05-02 12:56:37,723 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:37,723 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1504476571] [2021-05-02 12:56:37,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:37,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:38,159 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:38,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:38,161 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 123 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-05-02 12:56:38,161 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:38,161 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1504476571] [2021-05-02 12:56:38,161 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1504476571] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:38,162 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1666798774] [2021-05-02 12:56:38,162 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:38,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:38,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 47 conjunts are in the unsatisfiable core [2021-05-02 12:56:38,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:38,290 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:38,309 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 123 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-05-02 12:56:38,309 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1666798774] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:38,309 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:38,309 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2021-05-02 12:56:38,310 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737097390] [2021-05-02 12:56:38,310 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 12:56:38,310 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:38,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 12:56:38,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=641, Unknown=0, NotChecked=0, Total=702 [2021-05-02 12:56:38,310 INFO L87 Difference]: Start difference. First operand 212 states and 255 transitions. Second operand has 27 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 26 states have internal predecessors, (35), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:39,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:39,907 INFO L93 Difference]: Finished difference Result 245 states and 288 transitions. [2021-05-02 12:56:39,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 12:56:39,908 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 26 states have internal predecessors, (35), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-05-02 12:56:39,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:39,908 INFO L225 Difference]: With dead ends: 245 [2021-05-02 12:56:39,908 INFO L226 Difference]: Without dead ends: 227 [2021-05-02 12:56:39,909 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 492 ImplicationChecksByTransitivity, 1476.0ms TimeCoverageRelationStatistics Valid=246, Invalid=3176, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 12:56:39,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-05-02 12:56:39,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 213. [2021-05-02 12:56:39,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213 states, 208 states have (on average 1.2115384615384615) internal successors, (252), 208 states have internal predecessors, (252), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:39,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 256 transitions. [2021-05-02 12:56:39,932 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 256 transitions. Word has length 47 [2021-05-02 12:56:39,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:39,933 INFO L480 AbstractCegarLoop]: Abstraction has 213 states and 256 transitions. [2021-05-02 12:56:39,933 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 26 states have internal predecessors, (35), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:39,933 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 256 transitions. [2021-05-02 12:56:39,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 12:56:39,933 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:39,933 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:40,133 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 104 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable116 [2021-05-02 12:56:40,134 INFO L428 AbstractCegarLoop]: === Iteration 107 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:40,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:40,134 INFO L82 PathProgramCache]: Analyzing trace with hash 272921791, now seen corresponding path program 98 times [2021-05-02 12:56:40,134 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:40,134 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496226687] [2021-05-02 12:56:40,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:40,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:40,546 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:40,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:40,549 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 12:56:40,549 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:40,549 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496226687] [2021-05-02 12:56:40,549 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [496226687] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:40,549 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [123518213] [2021-05-02 12:56:40,549 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 105 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 105 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:40,600 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:56:40,600 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:56:40,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-02 12:56:40,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:40,699 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:40,731 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 12:56:40,732 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [123518213] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:40,732 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:40,732 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-02 12:56:40,732 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81652334] [2021-05-02 12:56:40,733 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 12:56:40,733 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:40,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 12:56:40,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=593, Unknown=0, NotChecked=0, Total=650 [2021-05-02 12:56:40,733 INFO L87 Difference]: Start difference. First operand 213 states and 256 transitions. Second operand has 26 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 25 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 12:56:42,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:42,726 INFO L93 Difference]: Finished difference Result 248 states and 291 transitions. [2021-05-02 12:56:42,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 12:56:42,726 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 25 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 47 [2021-05-02 12:56:42,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:42,727 INFO L225 Difference]: With dead ends: 248 [2021-05-02 12:56:42,727 INFO L226 Difference]: Without dead ends: 229 [2021-05-02 12:56:42,727 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 590 ImplicationChecksByTransitivity, 1635.7ms TimeCoverageRelationStatistics Valid=260, Invalid=3400, Unknown=0, NotChecked=0, Total=3660 [2021-05-02 12:56:42,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2021-05-02 12:56:42,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 214. [2021-05-02 12:56:42,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 209 states have (on average 1.2105263157894737) internal successors, (253), 209 states have internal predecessors, (253), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:42,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 257 transitions. [2021-05-02 12:56:42,750 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 257 transitions. Word has length 47 [2021-05-02 12:56:42,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:42,751 INFO L480 AbstractCegarLoop]: Abstraction has 214 states and 257 transitions. [2021-05-02 12:56:42,751 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 25 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 12:56:42,751 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 257 transitions. [2021-05-02 12:56:42,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 12:56:42,751 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:42,751 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:42,952 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 105 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable117 [2021-05-02 12:56:42,952 INFO L428 AbstractCegarLoop]: === Iteration 108 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:42,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:42,952 INFO L82 PathProgramCache]: Analyzing trace with hash 733969647, now seen corresponding path program 99 times [2021-05-02 12:56:42,953 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:42,953 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [145652289] [2021-05-02 12:56:42,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:42,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:43,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:43,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:43,329 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-05-02 12:56:43,329 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:43,329 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [145652289] [2021-05-02 12:56:43,329 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [145652289] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:43,329 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2146846680] [2021-05-02 12:56:43,329 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 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:43,658 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-05-02 12:56:43,658 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:56:43,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 12:56:43,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:43,674 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:43,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:43,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:43,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:44,083 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 54 proven. 30 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2021-05-02 12:56:44,083 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2146846680] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:44,083 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:44,084 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 14] total 36 [2021-05-02 12:56:44,084 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559324649] [2021-05-02 12:56:44,084 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 12:56:44,084 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:44,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 12:56:44,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=1180, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 12:56:44,084 INFO L87 Difference]: Start difference. First operand 214 states and 257 transitions. Second operand has 36 states, 36 states have (on average 1.3055555555555556) internal successors, (47), 35 states have internal predecessors, (47), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:47,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:47,619 INFO L93 Difference]: Finished difference Result 330 states and 391 transitions. [2021-05-02 12:56:47,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 12:56:47,620 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.3055555555555556) internal successors, (47), 35 states have internal predecessors, (47), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-05-02 12:56:47,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:47,620 INFO L225 Difference]: With dead ends: 330 [2021-05-02 12:56:47,620 INFO L226 Difference]: Without dead ends: 242 [2021-05-02 12:56:47,621 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1324 ImplicationChecksByTransitivity, 3082.3ms TimeCoverageRelationStatistics Valid=412, Invalid=7244, Unknown=0, NotChecked=0, Total=7656 [2021-05-02 12:56:47,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2021-05-02 12:56:47,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 226. [2021-05-02 12:56:47,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 221 states have (on average 1.1900452488687783) internal successors, (263), 221 states have internal predecessors, (263), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:47,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 267 transitions. [2021-05-02 12:56:47,655 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 267 transitions. Word has length 47 [2021-05-02 12:56:47,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:47,655 INFO L480 AbstractCegarLoop]: Abstraction has 226 states and 267 transitions. [2021-05-02 12:56:47,655 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 1.3055555555555556) internal successors, (47), 35 states have internal predecessors, (47), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:47,655 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 267 transitions. [2021-05-02 12:56:47,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-02 12:56:47,655 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:47,655 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:47,855 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 106 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable118 [2021-05-02 12:56:47,856 INFO L428 AbstractCegarLoop]: === Iteration 109 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:47,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:47,856 INFO L82 PathProgramCache]: Analyzing trace with hash 609074559, now seen corresponding path program 100 times [2021-05-02 12:56:47,856 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:47,856 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [691026227] [2021-05-02 12:56:47,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:47,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:48,293 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:48,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:48,295 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 12 proven. 132 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 12:56:48,295 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:48,295 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [691026227] [2021-05-02 12:56:48,295 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [691026227] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:48,295 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [838471567] [2021-05-02 12:56:48,295 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 107 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 107 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:48,354 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:56:48,354 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:56:48,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 72 conjunts are in the unsatisfiable core [2021-05-02 12:56:48,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:48,835 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 12 proven. 132 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 12:56:48,835 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [838471567] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:48,835 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:48,835 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 39 [2021-05-02 12:56:48,835 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1168834728] [2021-05-02 12:56:48,835 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 12:56:48,835 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:48,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 12:56:48,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1383, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 12:56:48,836 INFO L87 Difference]: Start difference. First operand 226 states and 267 transitions. Second operand has 39 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 38 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:50,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:50,207 INFO L93 Difference]: Finished difference Result 243 states and 283 transitions. [2021-05-02 12:56:50,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 12:56:50,208 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 38 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 48 [2021-05-02 12:56:50,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:50,209 INFO L225 Difference]: With dead ends: 243 [2021-05-02 12:56:50,209 INFO L226 Difference]: Without dead ends: 212 [2021-05-02 12:56:50,209 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 606 ImplicationChecksByTransitivity, 1601.2ms TimeCoverageRelationStatistics Valid=231, Invalid=3675, Unknown=0, NotChecked=0, Total=3906 [2021-05-02 12:56:50,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-05-02 12:56:50,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 212. [2021-05-02 12:56:50,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 207 states have (on average 1.1932367149758454) internal successors, (247), 207 states have internal predecessors, (247), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:50,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 251 transitions. [2021-05-02 12:56:50,250 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 251 transitions. Word has length 48 [2021-05-02 12:56:50,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:50,250 INFO L480 AbstractCegarLoop]: Abstraction has 212 states and 251 transitions. [2021-05-02 12:56:50,250 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 38 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:50,250 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 251 transitions. [2021-05-02 12:56:50,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-02 12:56:50,250 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:50,251 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:50,472 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable119,107 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:50,473 INFO L428 AbstractCegarLoop]: === Iteration 110 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:50,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:50,473 INFO L82 PathProgramCache]: Analyzing trace with hash 1707131277, now seen corresponding path program 101 times [2021-05-02 12:56:50,473 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:50,473 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [582731088] [2021-05-02 12:56:50,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:50,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:50,994 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:50,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:50,997 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 0 proven. 133 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-05-02 12:56:50,997 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:50,997 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [582731088] [2021-05-02 12:56:50,997 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [582731088] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:50,997 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2138979268] [2021-05-02 12:56:50,997 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 108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:56,666 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-05-02 12:56:56,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:56:56,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-02 12:56:56,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:57,096 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 0 proven. 133 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-05-02 12:56:57,096 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2138979268] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:57,096 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:57,096 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 38 [2021-05-02 12:56:57,096 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589146018] [2021-05-02 12:56:57,096 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 12:56:57,096 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:57,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 12:56:57,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=1291, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 12:56:57,097 INFO L87 Difference]: Start difference. First operand 212 states and 251 transitions. Second operand has 38 states, 38 states have (on average 1.2105263157894737) internal successors, (46), 37 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:58,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:58,399 INFO L93 Difference]: Finished difference Result 245 states and 284 transitions. [2021-05-02 12:56:58,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 12:56:58,399 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.2105263157894737) internal successors, (46), 37 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 48 [2021-05-02 12:56:58,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:58,400 INFO L225 Difference]: With dead ends: 245 [2021-05-02 12:56:58,400 INFO L226 Difference]: Without dead ends: 227 [2021-05-02 12:56:58,400 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 585 ImplicationChecksByTransitivity, 1613.3ms TimeCoverageRelationStatistics Valid=254, Invalid=3528, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 12:56:58,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-05-02 12:56:58,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 213. [2021-05-02 12:56:58,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213 states, 208 states have (on average 1.1923076923076923) internal successors, (248), 208 states have internal predecessors, (248), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:58,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 252 transitions. [2021-05-02 12:56:58,429 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 252 transitions. Word has length 48 [2021-05-02 12:56:58,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:58,430 INFO L480 AbstractCegarLoop]: Abstraction has 213 states and 252 transitions. [2021-05-02 12:56:58,430 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 1.2105263157894737) internal successors, (46), 37 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:58,430 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 252 transitions. [2021-05-02 12:56:58,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-02 12:56:58,430 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:58,430 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:58,630 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable120,108 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:58,631 INFO L428 AbstractCegarLoop]: === Iteration 111 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:58,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:58,631 INFO L82 PathProgramCache]: Analyzing trace with hash 1475687295, now seen corresponding path program 102 times [2021-05-02 12:56:58,631 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:58,631 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [703924075] [2021-05-02 12:56:58,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:58,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:59,034 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:59,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:59,036 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 0 proven. 127 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 12:56:59,036 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:59,036 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [703924075] [2021-05-02 12:56:59,036 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [703924075] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:59,036 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1400913405] [2021-05-02 12:56:59,036 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 109 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 109 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:59,591 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-05-02 12:56:59,591 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:56:59,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 64 conjunts are in the unsatisfiable core [2021-05-02 12:56:59,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:59,603 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:59,605 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:59,610 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:59,611 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:59,614 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:59,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:59,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:59,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:59,663 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:59,664 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:59,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:59,667 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:59,670 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:59,671 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:59,754 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:59,774 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 0 proven. 127 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 12:56:59,775 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1400913405] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:59,775 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:59,775 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 28 [2021-05-02 12:56:59,775 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610081057] [2021-05-02 12:56:59,775 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 12:56:59,775 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:59,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 12:56:59,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=693, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:56:59,776 INFO L87 Difference]: Start difference. First operand 213 states and 252 transitions. Second operand has 28 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 27 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:01,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:57:01,415 INFO L93 Difference]: Finished difference Result 248 states and 287 transitions. [2021-05-02 12:57:01,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 12:57:01,416 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 27 states have internal predecessors, (37), 2 states have call successors, (4), 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 48 [2021-05-02 12:57:01,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:57:01,416 INFO L225 Difference]: With dead ends: 248 [2021-05-02 12:57:01,417 INFO L226 Difference]: Without dead ends: 229 [2021-05-02 12:57:01,417 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 1501.4ms TimeCoverageRelationStatistics Valid=244, Invalid=3296, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 12:57:01,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2021-05-02 12:57:01,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 214. [2021-05-02 12:57:01,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 209 states have (on average 1.1913875598086126) internal successors, (249), 209 states have internal predecessors, (249), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:01,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 253 transitions. [2021-05-02 12:57:01,443 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 253 transitions. Word has length 48 [2021-05-02 12:57:01,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:57:01,443 INFO L480 AbstractCegarLoop]: Abstraction has 214 states and 253 transitions. [2021-05-02 12:57:01,444 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 27 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:01,444 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 253 transitions. [2021-05-02 12:57:01,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-02 12:57:01,444 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:57:01,444 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:57:01,644 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable121,109 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:57:01,645 INFO L428 AbstractCegarLoop]: === Iteration 112 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:57:01,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:57:01,645 INFO L82 PathProgramCache]: Analyzing trace with hash -1539800179, now seen corresponding path program 103 times [2021-05-02 12:57:01,645 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:57:01,645 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [903798406] [2021-05-02 12:57:01,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:57:01,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:02,021 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:57:02,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:02,023 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-05-02 12:57:02,023 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:57:02,023 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [903798406] [2021-05-02 12:57:02,023 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [903798406] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:02,023 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1431438756] [2021-05-02 12:57:02,023 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 110 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 110 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:57:02,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:02,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-02 12:57:02,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:57:02,170 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:02,194 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-05-02 12:57:02,194 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1431438756] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:02,194 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:57:02,194 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-02 12:57:02,194 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807799886] [2021-05-02 12:57:02,194 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 12:57:02,195 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:57:02,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 12:57:02,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=594, Unknown=0, NotChecked=0, Total=650 [2021-05-02 12:57:02,195 INFO L87 Difference]: Start difference. First operand 214 states and 253 transitions. Second operand has 26 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 25 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 12:57:03,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:57:03,988 INFO L93 Difference]: Finished difference Result 251 states and 290 transitions. [2021-05-02 12:57:03,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 12:57:03,988 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 25 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 48 [2021-05-02 12:57:03,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:57:03,989 INFO L225 Difference]: With dead ends: 251 [2021-05-02 12:57:03,989 INFO L226 Difference]: Without dead ends: 231 [2021-05-02 12:57:03,989 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 527 ImplicationChecksByTransitivity, 1440.2ms TimeCoverageRelationStatistics Valid=242, Invalid=3180, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 12:57:03,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2021-05-02 12:57:04,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 215. [2021-05-02 12:57:04,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 210 states have (on average 1.1904761904761905) internal successors, (250), 210 states have internal predecessors, (250), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:04,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 254 transitions. [2021-05-02 12:57:04,020 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 254 transitions. Word has length 48 [2021-05-02 12:57:04,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:57:04,021 INFO L480 AbstractCegarLoop]: Abstraction has 215 states and 254 transitions. [2021-05-02 12:57:04,021 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 25 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 12:57:04,021 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 254 transitions. [2021-05-02 12:57:04,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-02 12:57:04,021 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:57:04,021 INFO L523 BasicCegarLoop]: trace histogram [24, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:57:04,221 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 110 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable122 [2021-05-02 12:57:04,222 INFO L428 AbstractCegarLoop]: === Iteration 113 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:57:04,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:57:04,222 INFO L82 PathProgramCache]: Analyzing trace with hash -1528696755, now seen corresponding path program 104 times [2021-05-02 12:57:04,222 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:57:04,222 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [223936623] [2021-05-02 12:57:04,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:57:04,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:04,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:57:04,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:04,895 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 321 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-05-02 12:57:04,895 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:57:04,895 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [223936623] [2021-05-02 12:57:04,895 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [223936623] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:04,895 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1521433874] [2021-05-02 12:57:04,895 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 111 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 111 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:57:04,947 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:57:04,947 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:57:04,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-02 12:57:04,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:57:05,082 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:05,093 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 321 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-05-02 12:57:05,093 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1521433874] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:05,093 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:57:05,094 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2021-05-02 12:57:05,094 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [977645350] [2021-05-02 12:57:05,094 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 12:57:05,094 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:57:05,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 12:57:05,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=1184, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 12:57:05,094 INFO L87 Difference]: Start difference. First operand 215 states and 254 transitions. Second operand has 36 states, 36 states have (on average 1.2222222222222223) internal successors, (44), 35 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:09,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:57:09,107 INFO L93 Difference]: Finished difference Result 319 states and 414 transitions. [2021-05-02 12:57:09,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-02 12:57:09,108 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.2222222222222223) internal successors, (44), 35 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 48 [2021-05-02 12:57:09,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:57:09,108 INFO L225 Difference]: With dead ends: 319 [2021-05-02 12:57:09,108 INFO L226 Difference]: Without dead ends: 306 [2021-05-02 12:57:09,109 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1377 ImplicationChecksByTransitivity, 2703.5ms TimeCoverageRelationStatistics Valid=372, Invalid=7460, Unknown=0, NotChecked=0, Total=7832 [2021-05-02 12:57:09,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2021-05-02 12:57:09,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 226. [2021-05-02 12:57:09,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 221 states have (on average 1.1900452488687783) internal successors, (263), 221 states have internal predecessors, (263), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:09,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 267 transitions. [2021-05-02 12:57:09,137 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 267 transitions. Word has length 48 [2021-05-02 12:57:09,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:57:09,137 INFO L480 AbstractCegarLoop]: Abstraction has 226 states and 267 transitions. [2021-05-02 12:57:09,137 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 1.2222222222222223) internal successors, (44), 35 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:09,137 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 267 transitions. [2021-05-02 12:57:09,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 12:57:09,138 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:57:09,138 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:57:09,338 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 111 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable123 [2021-05-02 12:57:09,338 INFO L428 AbstractCegarLoop]: === Iteration 114 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:57:09,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:57:09,338 INFO L82 PathProgramCache]: Analyzing trace with hash -195947921, now seen corresponding path program 105 times [2021-05-02 12:57:09,339 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:57:09,339 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1945474524] [2021-05-02 12:57:09,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:57:09,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:09,802 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:57:09,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:09,804 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-05-02 12:57:09,805 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:57:09,805 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1945474524] [2021-05-02 12:57:09,805 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1945474524] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:09,805 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1242093862] [2021-05-02 12:57:09,805 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 112 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 112 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:57:10,273 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-05-02 12:57:10,273 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:57:10,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 74 conjunts are in the unsatisfiable core [2021-05-02 12:57:10,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:57:10,752 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-05-02 12:57:10,752 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1242093862] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:10,752 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:57:10,752 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 40 [2021-05-02 12:57:10,752 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156099613] [2021-05-02 12:57:10,752 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-02 12:57:10,753 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:57:10,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-02 12:57:10,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1437, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 12:57:10,753 INFO L87 Difference]: Start difference. First operand 226 states and 267 transitions. Second operand has 40 states, 40 states have (on average 1.2) internal successors, (48), 39 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:12,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:57:12,191 INFO L93 Difference]: Finished difference Result 259 states and 300 transitions. [2021-05-02 12:57:12,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 12:57:12,192 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.2) internal successors, (48), 39 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2021-05-02 12:57:12,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:57:12,192 INFO L225 Difference]: With dead ends: 259 [2021-05-02 12:57:12,192 INFO L226 Difference]: Without dead ends: 241 [2021-05-02 12:57:12,193 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 655 ImplicationChecksByTransitivity, 1657.7ms TimeCoverageRelationStatistics Valid=270, Invalid=3890, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 12:57:12,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2021-05-02 12:57:12,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 227. [2021-05-02 12:57:12,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 222 states have (on average 1.1891891891891893) internal successors, (264), 222 states have internal predecessors, (264), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:12,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 268 transitions. [2021-05-02 12:57:12,221 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 268 transitions. Word has length 49 [2021-05-02 12:57:12,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:57:12,221 INFO L480 AbstractCegarLoop]: Abstraction has 227 states and 268 transitions. [2021-05-02 12:57:12,221 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 1.2) internal successors, (48), 39 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:12,222 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 268 transitions. [2021-05-02 12:57:12,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 12:57:12,222 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:57:12,222 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:57:12,422 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 112 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable124 [2021-05-02 12:57:12,423 INFO L428 AbstractCegarLoop]: === Iteration 115 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:57:12,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:57:12,423 INFO L82 PathProgramCache]: Analyzing trace with hash 106712255, now seen corresponding path program 106 times [2021-05-02 12:57:12,423 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:57:12,423 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1196799367] [2021-05-02 12:57:12,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:57:12,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:12,907 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:57:12,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:12,910 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 12:57:12,910 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:57:12,910 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1196799367] [2021-05-02 12:57:12,910 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1196799367] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:12,910 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [542574143] [2021-05-02 12:57:12,910 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 113 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 113 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:57:12,962 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:57:12,963 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:57:12,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-02 12:57:12,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:57:13,045 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:13,065 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 12:57:13,066 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [542574143] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:13,066 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:57:13,066 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-02 12:57:13,066 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [829715827] [2021-05-02 12:57:13,066 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 12:57:13,066 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:57:13,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 12:57:13,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=693, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:57:13,066 INFO L87 Difference]: Start difference. First operand 227 states and 268 transitions. Second operand has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 27 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:14,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:57:14,915 INFO L93 Difference]: Finished difference Result 262 states and 303 transitions. [2021-05-02 12:57:14,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 12:57:14,916 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 27 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2021-05-02 12:57:14,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:57:14,916 INFO L225 Difference]: With dead ends: 262 [2021-05-02 12:57:14,916 INFO L226 Difference]: Without dead ends: 243 [2021-05-02 12:57:14,917 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 525 ImplicationChecksByTransitivity, 1585.1ms TimeCoverageRelationStatistics Valid=252, Invalid=3408, Unknown=0, NotChecked=0, Total=3660 [2021-05-02 12:57:14,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2021-05-02 12:57:14,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 228. [2021-05-02 12:57:14,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 223 states have (on average 1.188340807174888) internal successors, (265), 223 states have internal predecessors, (265), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:14,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 269 transitions. [2021-05-02 12:57:14,949 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 269 transitions. Word has length 49 [2021-05-02 12:57:14,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:57:14,950 INFO L480 AbstractCegarLoop]: Abstraction has 228 states and 269 transitions. [2021-05-02 12:57:14,950 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 27 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:14,950 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 269 transitions. [2021-05-02 12:57:14,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 12:57:14,950 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:57:14,950 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:57:15,151 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 113 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable125 [2021-05-02 12:57:15,151 INFO L428 AbstractCegarLoop]: === Iteration 116 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:57:15,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:57:15,151 INFO L82 PathProgramCache]: Analyzing trace with hash 987779247, now seen corresponding path program 107 times [2021-05-02 12:57:15,151 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:57:15,151 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [619246068] [2021-05-02 12:57:15,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:57:15,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:15,591 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:57:15,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:15,594 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 0 proven. 133 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-05-02 12:57:15,594 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:57:15,595 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [619246068] [2021-05-02 12:57:15,595 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [619246068] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:15,595 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1272200537] [2021-05-02 12:57:15,595 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 114 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 114 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:57:20,628 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-05-02 12:57:20,629 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:57:20,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 101 conjunts are in the unsatisfiable core [2021-05-02 12:57:20,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:57:20,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:20,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:20,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:20,687 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:20,725 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:20,726 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:20,729 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:20,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:20,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:20,768 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:20,854 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:20,857 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:21,248 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 0 proven. 133 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-05-02 12:57:21,248 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1272200537] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:21,248 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:57:21,248 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 39 [2021-05-02 12:57:21,248 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564225456] [2021-05-02 12:57:21,248 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 12:57:21,248 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:57:21,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 12:57:21,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 12:57:21,249 INFO L87 Difference]: Start difference. First operand 228 states and 269 transitions. Second operand has 39 states, 39 states have (on average 1.3076923076923077) internal successors, (51), 38 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:23,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:57:23,505 INFO L93 Difference]: Finished difference Result 265 states and 306 transitions. [2021-05-02 12:57:23,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 12:57:23,505 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.3076923076923077) internal successors, (51), 38 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2021-05-02 12:57:23,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:57:23,506 INFO L225 Difference]: With dead ends: 265 [2021-05-02 12:57:23,506 INFO L226 Difference]: Without dead ends: 245 [2021-05-02 12:57:23,506 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1406 ImplicationChecksByTransitivity, 2307.7ms TimeCoverageRelationStatistics Valid=363, Invalid=5957, Unknown=0, NotChecked=0, Total=6320 [2021-05-02 12:57:23,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2021-05-02 12:57:23,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 229. [2021-05-02 12:57:23,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 224 states have (on average 1.1875) internal successors, (266), 224 states have internal predecessors, (266), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:23,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 270 transitions. [2021-05-02 12:57:23,536 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 270 transitions. Word has length 49 [2021-05-02 12:57:23,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:57:23,536 INFO L480 AbstractCegarLoop]: Abstraction has 229 states and 270 transitions. [2021-05-02 12:57:23,536 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.3076923076923077) internal successors, (51), 38 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:23,536 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 270 transitions. [2021-05-02 12:57:23,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 12:57:23,536 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:57:23,536 INFO L523 BasicCegarLoop]: trace histogram [25, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:57:23,736 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 114 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable126 [2021-05-02 12:57:23,737 INFO L428 AbstractCegarLoop]: === Iteration 117 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:57:23,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:57:23,737 INFO L82 PathProgramCache]: Analyzing trace with hash -446053522, now seen corresponding path program 108 times [2021-05-02 12:57:23,737 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:57:23,737 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1775098303] [2021-05-02 12:57:23,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:57:23,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:24,471 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:57:24,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:24,473 INFO L134 CoverageAnalysis]: Checked inductivity of 356 backedges. 0 proven. 346 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-05-02 12:57:24,474 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:57:24,474 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1775098303] [2021-05-02 12:57:24,474 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1775098303] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:24,474 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [504368180] [2021-05-02 12:57:24,474 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 115 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 115 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:57:24,630 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 12:57:24,630 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:57:24,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 12:57:24,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:57:24,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:24,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:24,662 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:24,663 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:24,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:24,667 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:25,300 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:25,306 INFO L134 CoverageAnalysis]: Checked inductivity of 356 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2021-05-02 12:57:25,306 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [504368180] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:25,306 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:57:25,306 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 14] total 48 [2021-05-02 12:57:25,306 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1448269955] [2021-05-02 12:57:25,306 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-02 12:57:25,306 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:57:25,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-02 12:57:25,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=2152, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 12:57:25,307 INFO L87 Difference]: Start difference. First operand 229 states and 270 transitions. Second operand has 48 states, 48 states have (on average 1.2291666666666667) internal successors, (59), 47 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:37,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:57:37,575 INFO L93 Difference]: Finished difference Result 371 states and 480 transitions. [2021-05-02 12:57:37,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2021-05-02 12:57:37,576 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.2291666666666667) internal successors, (59), 47 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2021-05-02 12:57:37,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:57:37,577 INFO L225 Difference]: With dead ends: 371 [2021-05-02 12:57:37,577 INFO L226 Difference]: Without dead ends: 334 [2021-05-02 12:57:37,579 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9100 ImplicationChecksByTransitivity, 9940.7ms TimeCoverageRelationStatistics Valid=1006, Invalid=32666, Unknown=0, NotChecked=0, Total=33672 [2021-05-02 12:57:37,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2021-05-02 12:57:37,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 250. [2021-05-02 12:57:37,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 250 states, 245 states have (on average 1.1795918367346938) internal successors, (289), 245 states have internal predecessors, (289), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:37,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 293 transitions. [2021-05-02 12:57:37,614 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 293 transitions. Word has length 49 [2021-05-02 12:57:37,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:57:37,614 INFO L480 AbstractCegarLoop]: Abstraction has 250 states and 293 transitions. [2021-05-02 12:57:37,614 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 1.2291666666666667) internal successors, (59), 47 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:37,614 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 293 transitions. [2021-05-02 12:57:37,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 12:57:37,614 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:57:37,615 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:57:37,817 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable127,115 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:57:37,817 INFO L428 AbstractCegarLoop]: === Iteration 118 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:57:37,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:57:37,818 INFO L82 PathProgramCache]: Analyzing trace with hash 938139085, now seen corresponding path program 109 times [2021-05-02 12:57:37,818 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:57:37,818 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1376654889] [2021-05-02 12:57:37,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:57:37,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:38,151 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:57:38,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:38,153 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-05-02 12:57:38,153 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:57:38,153 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1376654889] [2021-05-02 12:57:38,153 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1376654889] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:38,153 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [120854507] [2021-05-02 12:57:38,154 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 116 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 116 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:57:38,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:38,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-02 12:57:38,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:57:38,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:38,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:38,301 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:38,346 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-05-02 12:57:38,346 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [120854507] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:38,346 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:57:38,346 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 20 [2021-05-02 12:57:38,346 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [395141003] [2021-05-02 12:57:38,346 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 12:57:38,346 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:57:38,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 12:57:38,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=341, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:57:38,347 INFO L87 Difference]: Start difference. First operand 250 states and 293 transitions. Second operand has 20 states, 20 states have (on average 1.9) internal successors, (38), 17 states have internal predecessors, (38), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:39,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:57:39,428 INFO L93 Difference]: Finished difference Result 585 states and 712 transitions. [2021-05-02 12:57:39,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 12:57:39,430 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.9) internal successors, (38), 17 states have internal predecessors, (38), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-02 12:57:39,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:57:39,431 INFO L225 Difference]: With dead ends: 585 [2021-05-02 12:57:39,431 INFO L226 Difference]: Without dead ends: 567 [2021-05-02 12:57:39,431 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 745.2ms TimeCoverageRelationStatistics Valid=104, Invalid=1086, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 12:57:39,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 567 states. [2021-05-02 12:57:39,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 567 to 257. [2021-05-02 12:57:39,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 252 states have (on average 1.1825396825396826) internal successors, (298), 252 states have internal predecessors, (298), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:39,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 302 transitions. [2021-05-02 12:57:39,467 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 302 transitions. Word has length 50 [2021-05-02 12:57:39,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:57:39,467 INFO L480 AbstractCegarLoop]: Abstraction has 257 states and 302 transitions. [2021-05-02 12:57:39,467 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 1.9) internal successors, (38), 17 states have internal predecessors, (38), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:39,467 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 302 transitions. [2021-05-02 12:57:39,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 12:57:39,467 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:57:39,467 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:57:39,668 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 116 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable128 [2021-05-02 12:57:39,668 INFO L428 AbstractCegarLoop]: === Iteration 119 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:57:39,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:57:39,668 INFO L82 PathProgramCache]: Analyzing trace with hash 618158975, now seen corresponding path program 110 times [2021-05-02 12:57:39,668 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:57:39,668 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2113387209] [2021-05-02 12:57:39,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:57:39,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:40,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:57:40,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:40,144 INFO L134 CoverageAnalysis]: Checked inductivity of 237 backedges. 0 proven. 146 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 12:57:40,145 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:57:40,145 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2113387209] [2021-05-02 12:57:40,145 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2113387209] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:40,145 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1613184290] [2021-05-02 12:57:40,145 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 117 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 117 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:57:40,198 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:57:40,198 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:57:40,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 51 conjunts are in the unsatisfiable core [2021-05-02 12:57:40,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:57:40,288 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:40,309 INFO L134 CoverageAnalysis]: Checked inductivity of 237 backedges. 0 proven. 146 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 12:57:40,310 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1613184290] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:40,310 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:57:40,310 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-02 12:57:40,310 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [17165073] [2021-05-02 12:57:40,310 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 12:57:40,310 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:57:40,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 12:57:40,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=746, Unknown=0, NotChecked=0, Total=812 [2021-05-02 12:57:40,310 INFO L87 Difference]: Start difference. First operand 257 states and 302 transitions. Second operand has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 28 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:42,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:57:42,343 INFO L93 Difference]: Finished difference Result 292 states and 337 transitions. [2021-05-02 12:57:42,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 12:57:42,344 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 28 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-02 12:57:42,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:57:42,344 INFO L225 Difference]: With dead ends: 292 [2021-05-02 12:57:42,344 INFO L226 Difference]: Without dead ends: 273 [2021-05-02 12:57:42,345 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 590 ImplicationChecksByTransitivity, 1685.1ms TimeCoverageRelationStatistics Valid=269, Invalid=3763, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 12:57:42,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2021-05-02 12:57:42,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 258. [2021-05-02 12:57:42,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 258 states, 253 states have (on average 1.1818181818181819) internal successors, (299), 253 states have internal predecessors, (299), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:42,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 258 states to 258 states and 303 transitions. [2021-05-02 12:57:42,401 INFO L78 Accepts]: Start accepts. Automaton has 258 states and 303 transitions. Word has length 50 [2021-05-02 12:57:42,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:57:42,401 INFO L480 AbstractCegarLoop]: Abstraction has 258 states and 303 transitions. [2021-05-02 12:57:42,401 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 28 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:42,401 INFO L276 IsEmpty]: Start isEmpty. Operand 258 states and 303 transitions. [2021-05-02 12:57:42,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 12:57:42,401 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:57:42,401 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:57:42,602 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable130,117 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:57:42,602 INFO L428 AbstractCegarLoop]: === Iteration 120 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:57:42,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:57:42,602 INFO L82 PathProgramCache]: Analyzing trace with hash 2033330125, now seen corresponding path program 111 times [2021-05-02 12:57:42,602 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:57:42,602 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [26050596] [2021-05-02 12:57:42,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:57:42,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:43,044 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:57:43,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:43,046 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 0 proven. 141 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-05-02 12:57:43,046 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:57:43,046 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [26050596] [2021-05-02 12:57:43,046 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [26050596] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:43,046 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2100263253] [2021-05-02 12:57:43,046 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 118 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 118 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:57:43,774 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-05-02 12:57:43,774 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:57:43,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 63 conjunts are in the unsatisfiable core [2021-05-02 12:57:43,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:57:43,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:43,793 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:43,806 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:43,807 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:43,810 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:43,811 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:43,818 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:43,819 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:43,945 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:44,012 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:44,034 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 0 proven. 141 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-05-02 12:57:44,034 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2100263253] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:44,034 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:57:44,034 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 31 [2021-05-02 12:57:44,035 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1281354756] [2021-05-02 12:57:44,035 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 12:57:44,035 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:57:44,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 12:57:44,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=859, Unknown=0, NotChecked=0, Total=930 [2021-05-02 12:57:44,035 INFO L87 Difference]: Start difference. First operand 258 states and 303 transitions. Second operand has 31 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 30 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:46,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:57:46,460 INFO L93 Difference]: Finished difference Result 295 states and 340 transitions. [2021-05-02 12:57:46,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 12:57:46,461 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 30 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-02 12:57:46,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:57:46,461 INFO L225 Difference]: With dead ends: 295 [2021-05-02 12:57:46,461 INFO L226 Difference]: Without dead ends: 275 [2021-05-02 12:57:46,462 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 986 ImplicationChecksByTransitivity, 2080.1ms TimeCoverageRelationStatistics Valid=323, Invalid=4933, Unknown=0, NotChecked=0, Total=5256 [2021-05-02 12:57:46,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2021-05-02 12:57:46,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 259. [2021-05-02 12:57:46,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 254 states have (on average 1.1811023622047243) internal successors, (300), 254 states have internal predecessors, (300), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:46,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 304 transitions. [2021-05-02 12:57:46,506 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 304 transitions. Word has length 50 [2021-05-02 12:57:46,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:57:46,506 INFO L480 AbstractCegarLoop]: Abstraction has 259 states and 304 transitions. [2021-05-02 12:57:46,506 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 30 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:46,506 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 304 transitions. [2021-05-02 12:57:46,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 12:57:46,506 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:57:46,507 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:57:46,711 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable131,118 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:57:46,711 INFO L428 AbstractCegarLoop]: === Iteration 121 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:57:46,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:57:46,711 INFO L82 PathProgramCache]: Analyzing trace with hash 1735097903, now seen corresponding path program 112 times [2021-05-02 12:57:46,712 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:57:46,712 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [930393500] [2021-05-02 12:57:46,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:57:46,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:47,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:57:47,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:47,338 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 13 proven. 156 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-05-02 12:57:47,338 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:57:47,338 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [930393500] [2021-05-02 12:57:47,338 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [930393500] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:47,338 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1944848929] [2021-05-02 12:57:47,338 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 119 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 119 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:57:47,409 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:57:47,410 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:57:47,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 78 conjunts are in the unsatisfiable core [2021-05-02 12:57:47,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:57:48,017 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 13 proven. 156 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-05-02 12:57:48,018 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1944848929] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:48,018 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:57:48,018 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 42 [2021-05-02 12:57:48,018 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1236719090] [2021-05-02 12:57:48,018 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 12:57:48,018 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:57:48,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 12:57:48,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1615, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 12:57:48,019 INFO L87 Difference]: Start difference. First operand 259 states and 304 transitions. Second operand has 42 states, 42 states have (on average 1.2142857142857142) internal successors, (51), 41 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:49,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:57:49,503 INFO L93 Difference]: Finished difference Result 277 states and 321 transitions. [2021-05-02 12:57:49,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 12:57:49,503 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.2142857142857142) internal successors, (51), 41 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-02 12:57:49,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:57:49,504 INFO L225 Difference]: With dead ends: 277 [2021-05-02 12:57:49,504 INFO L226 Difference]: Without dead ends: 244 [2021-05-02 12:57:49,505 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 38 SyntacticMatches, 2 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 715 ImplicationChecksByTransitivity, 2006.3ms TimeCoverageRelationStatistics Valid=250, Invalid=4306, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 12:57:49,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-05-02 12:57:49,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 244. [2021-05-02 12:57:49,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 239 states have (on average 1.1841004184100419) internal successors, (283), 239 states have internal predecessors, (283), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:49,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 287 transitions. [2021-05-02 12:57:49,537 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 287 transitions. Word has length 51 [2021-05-02 12:57:49,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:57:49,537 INFO L480 AbstractCegarLoop]: Abstraction has 244 states and 287 transitions. [2021-05-02 12:57:49,537 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 1.2142857142857142) internal successors, (51), 41 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:49,537 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 287 transitions. [2021-05-02 12:57:49,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 12:57:49,537 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:57:49,537 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:57:49,737 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 119 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable132 [2021-05-02 12:57:49,738 INFO L428 AbstractCegarLoop]: === Iteration 122 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:57:49,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:57:49,738 INFO L82 PathProgramCache]: Analyzing trace with hash -706861889, now seen corresponding path program 113 times [2021-05-02 12:57:49,738 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:57:49,738 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1362267801] [2021-05-02 12:57:49,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:57:49,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:50,241 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:57:50,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:50,244 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 0 proven. 157 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 12:57:50,244 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:57:50,244 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1362267801] [2021-05-02 12:57:50,244 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1362267801] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:50,244 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [463469496] [2021-05-02 12:57:50,244 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 120 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 120 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:57:55,866 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-05-02 12:57:55,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:57:55,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 76 conjunts are in the unsatisfiable core [2021-05-02 12:57:55,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:57:56,375 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 0 proven. 157 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 12:57:56,376 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [463469496] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:56,376 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:57:56,376 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 41 [2021-05-02 12:57:56,376 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988819464] [2021-05-02 12:57:56,376 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 12:57:56,376 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:57:56,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 12:57:56,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1515, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 12:57:56,376 INFO L87 Difference]: Start difference. First operand 244 states and 287 transitions. Second operand has 41 states, 41 states have (on average 1.1951219512195121) internal successors, (49), 40 states have internal predecessors, (49), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:58,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:57:58,148 INFO L93 Difference]: Finished difference Result 279 states and 322 transitions. [2021-05-02 12:57:58,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 12:57:58,148 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.1951219512195121) internal successors, (49), 40 states have internal predecessors, (49), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-02 12:57:58,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:57:58,149 INFO L225 Difference]: With dead ends: 279 [2021-05-02 12:57:58,149 INFO L226 Difference]: Without dead ends: 260 [2021-05-02 12:57:58,149 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 692 ImplicationChecksByTransitivity, 1784.3ms TimeCoverageRelationStatistics Valid=276, Invalid=4146, Unknown=0, NotChecked=0, Total=4422 [2021-05-02 12:57:58,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-05-02 12:57:58,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 245. [2021-05-02 12:57:58,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 245 states, 240 states have (on average 1.1833333333333333) internal successors, (284), 240 states have internal predecessors, (284), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:58,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 288 transitions. [2021-05-02 12:57:58,184 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 288 transitions. Word has length 51 [2021-05-02 12:57:58,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:57:58,185 INFO L480 AbstractCegarLoop]: Abstraction has 245 states and 288 transitions. [2021-05-02 12:57:58,185 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 1.1951219512195121) internal successors, (49), 40 states have internal predecessors, (49), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:58,185 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 288 transitions. [2021-05-02 12:57:58,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 12:57:58,185 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:57:58,185 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:57:58,388 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 120 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable133 [2021-05-02 12:57:58,389 INFO L428 AbstractCegarLoop]: === Iteration 123 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:57:58,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:57:58,389 INFO L82 PathProgramCache]: Analyzing trace with hash 85668975, now seen corresponding path program 114 times [2021-05-02 12:57:58,389 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:57:58,389 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1790362347] [2021-05-02 12:57:58,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:57:58,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:58,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:57:58,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:58,885 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 0 proven. 150 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-05-02 12:57:58,886 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:57:58,886 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1790362347] [2021-05-02 12:57:58,886 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1790362347] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:58,886 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [350023750] [2021-05-02 12:57:58,886 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 121 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 121 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:57:59,880 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-05-02 12:57:59,880 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:57:59,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 59 conjunts are in the unsatisfiable core [2021-05-02 12:57:59,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:58:00,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:58:00,027 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 0 proven. 150 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-05-02 12:58:00,027 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [350023750] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:58:00,028 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:58:00,028 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-02 12:58:00,028 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601733109] [2021-05-02 12:58:00,028 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 12:58:00,028 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:58:00,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 12:58:00,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=747, Unknown=0, NotChecked=0, Total=812 [2021-05-02 12:58:00,028 INFO L87 Difference]: Start difference. First operand 245 states and 288 transitions. Second operand has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 28 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:58:02,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:58:02,044 INFO L93 Difference]: Finished difference Result 282 states and 325 transitions. [2021-05-02 12:58:02,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-02 12:58:02,045 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 28 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-02 12:58:02,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:58:02,045 INFO L225 Difference]: With dead ends: 282 [2021-05-02 12:58:02,046 INFO L226 Difference]: Without dead ends: 262 [2021-05-02 12:58:02,046 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 561 ImplicationChecksByTransitivity, 1679.3ms TimeCoverageRelationStatistics Valid=258, Invalid=3648, Unknown=0, NotChecked=0, Total=3906 [2021-05-02 12:58:02,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2021-05-02 12:58:02,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 246. [2021-05-02 12:58:02,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 246 states, 241 states have (on average 1.1825726141078838) internal successors, (285), 241 states have internal predecessors, (285), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:58:02,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 289 transitions. [2021-05-02 12:58:02,079 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 289 transitions. Word has length 51 [2021-05-02 12:58:02,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:58:02,080 INFO L480 AbstractCegarLoop]: Abstraction has 246 states and 289 transitions. [2021-05-02 12:58:02,080 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 28 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:58:02,080 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 289 transitions. [2021-05-02 12:58:02,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 12:58:02,080 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:58:02,080 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:58:02,280 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable134,121 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:58:02,281 INFO L428 AbstractCegarLoop]: === Iteration 124 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:58:02,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:58:02,281 INFO L82 PathProgramCache]: Analyzing trace with hash 1628941951, now seen corresponding path program 115 times [2021-05-02 12:58:02,281 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:58:02,281 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1196149772] [2021-05-02 12:58:02,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:58:02,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:58:02,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:58:02,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:58:02,719 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 0 proven. 148 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 12:58:02,719 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:58:02,719 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1196149772] [2021-05-02 12:58:02,719 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1196149772] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:58:02,720 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1683193671] [2021-05-02 12:58:02,720 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 122 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 122 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:58:02,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:58:02,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-02 12:58:02,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:58:02,868 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:58:02,892 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 0 proven. 148 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 12:58:02,892 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1683193671] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:58:02,892 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:58:02,892 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-02 12:58:02,892 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246476042] [2021-05-02 12:58:02,892 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 12:58:02,893 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:58:02,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 12:58:02,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=695, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:58:02,893 INFO L87 Difference]: Start difference. First operand 246 states and 289 transitions. Second operand has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 27 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:58:05,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:58:05,040 INFO L93 Difference]: Finished difference Result 285 states and 328 transitions. [2021-05-02 12:58:05,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 12:58:05,041 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 27 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-02 12:58:05,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:58:05,042 INFO L225 Difference]: With dead ends: 285 [2021-05-02 12:58:05,042 INFO L226 Difference]: Without dead ends: 264 [2021-05-02 12:58:05,043 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 663 ImplicationChecksByTransitivity, 1709.6ms TimeCoverageRelationStatistics Valid=272, Invalid=3888, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 12:58:05,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2021-05-02 12:58:05,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 247. [2021-05-02 12:58:05,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 247 states, 242 states have (on average 1.1818181818181819) internal successors, (286), 242 states have internal predecessors, (286), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:58:05,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 290 transitions. [2021-05-02 12:58:05,092 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 290 transitions. Word has length 51 [2021-05-02 12:58:05,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:58:05,092 INFO L480 AbstractCegarLoop]: Abstraction has 247 states and 290 transitions. [2021-05-02 12:58:05,092 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 27 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:58:05,092 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 290 transitions. [2021-05-02 12:58:05,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 12:58:05,092 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:58:05,092 INFO L523 BasicCegarLoop]: trace histogram [26, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:58:05,315 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 122 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable135 [2021-05-02 12:58:05,315 INFO L428 AbstractCegarLoop]: === Iteration 125 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:58:05,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:58:05,316 INFO L82 PathProgramCache]: Analyzing trace with hash 129799072, now seen corresponding path program 116 times [2021-05-02 12:58:05,316 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:58:05,316 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1203054747] [2021-05-02 12:58:05,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:58:05,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:58:06,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:58:06,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:58:06,102 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 0 proven. 372 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:58:06,102 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:58:06,103 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1203054747] [2021-05-02 12:58:06,103 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1203054747] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:58:06,103 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [178112470] [2021-05-02 12:58:06,103 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 123 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 123 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:58:06,158 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:58:06,159 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:58:06,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 69 conjunts are in the unsatisfiable core [2021-05-02 12:58:06,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:58:06,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:58:06,291 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 0 proven. 372 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:58:06,291 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [178112470] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:58:06,291 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:58:06,291 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 38 [2021-05-02 12:58:06,291 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796707588] [2021-05-02 12:58:06,291 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 12:58:06,291 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:58:06,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 12:58:06,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=1326, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 12:58:06,292 INFO L87 Difference]: Start difference. First operand 247 states and 290 transitions. Second operand has 38 states, 38 states have (on average 1.2105263157894737) internal successors, (46), 37 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:58:10,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:58:10,791 INFO L93 Difference]: Finished difference Result 367 states and 476 transitions. [2021-05-02 12:58:10,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-02 12:58:10,792 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.2105263157894737) internal successors, (46), 37 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-02 12:58:10,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:58:10,792 INFO L225 Difference]: With dead ends: 367 [2021-05-02 12:58:10,792 INFO L226 Difference]: Without dead ends: 354 [2021-05-02 12:58:10,793 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1486 ImplicationChecksByTransitivity, 2977.0ms TimeCoverageRelationStatistics Valid=384, Invalid=8172, Unknown=0, NotChecked=0, Total=8556 [2021-05-02 12:58:10,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 354 states. [2021-05-02 12:58:10,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 354 to 258. [2021-05-02 12:58:10,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 258 states, 253 states have (on average 1.1818181818181819) internal successors, (299), 253 states have internal predecessors, (299), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:58:10,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 258 states to 258 states and 303 transitions. [2021-05-02 12:58:10,827 INFO L78 Accepts]: Start accepts. Automaton has 258 states and 303 transitions. Word has length 51 [2021-05-02 12:58:10,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:58:10,827 INFO L480 AbstractCegarLoop]: Abstraction has 258 states and 303 transitions. [2021-05-02 12:58:10,827 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 1.2105263157894737) internal successors, (46), 37 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:58:10,827 INFO L276 IsEmpty]: Start isEmpty. Operand 258 states and 303 transitions. [2021-05-02 12:58:10,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-02 12:58:10,827 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:58:10,828 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:58:11,028 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable136,123 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:58:11,028 INFO L428 AbstractCegarLoop]: === Iteration 126 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:58:11,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:58:11,028 INFO L82 PathProgramCache]: Analyzing trace with hash 1167164287, now seen corresponding path program 117 times [2021-05-02 12:58:11,029 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:58:11,029 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [53492466] [2021-05-02 12:58:11,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:58:11,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:58:11,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:58:11,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:58:11,566 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 12:58:11,566 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:58:11,567 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [53492466] [2021-05-02 12:58:11,567 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [53492466] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:58:11,567 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [394153493] [2021-05-02 12:58:11,567 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 124 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 124 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:58:13,189 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-05-02 12:58:13,190 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:58:13,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 80 conjunts are in the unsatisfiable core [2021-05-02 12:58:13,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:58:13,764 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 12:58:13,765 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [394153493] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:58:13,765 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:58:13,765 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 43 [2021-05-02 12:58:13,765 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493867435] [2021-05-02 12:58:13,765 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 12:58:13,765 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:58:13,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 12:58:13,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=1673, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 12:58:13,766 INFO L87 Difference]: Start difference. First operand 258 states and 303 transitions. Second operand has 43 states, 43 states have (on average 1.186046511627907) internal successors, (51), 42 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:58:15,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:58:15,455 INFO L93 Difference]: Finished difference Result 293 states and 338 transitions. [2021-05-02 12:58:15,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 12:58:15,455 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.186046511627907) internal successors, (51), 42 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 52 [2021-05-02 12:58:15,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:58:15,456 INFO L225 Difference]: With dead ends: 293 [2021-05-02 12:58:15,456 INFO L226 Difference]: Without dead ends: 274 [2021-05-02 12:58:15,456 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 768 ImplicationChecksByTransitivity, 1933.5ms TimeCoverageRelationStatistics Valid=292, Invalid=4538, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 12:58:15,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2021-05-02 12:58:15,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 259. [2021-05-02 12:58:15,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 254 states have (on average 1.1811023622047243) internal successors, (300), 254 states have internal predecessors, (300), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:58:15,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 304 transitions. [2021-05-02 12:58:15,491 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 304 transitions. Word has length 52 [2021-05-02 12:58:15,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:58:15,491 INFO L480 AbstractCegarLoop]: Abstraction has 259 states and 304 transitions. [2021-05-02 12:58:15,491 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 1.186046511627907) internal successors, (51), 42 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:58:15,492 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 304 transitions. [2021-05-02 12:58:15,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-02 12:58:15,492 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:58:15,492 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:58:15,692 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 124 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable137 [2021-05-02 12:58:15,693 INFO L428 AbstractCegarLoop]: === Iteration 127 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:58:15,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:58:15,693 INFO L82 PathProgramCache]: Analyzing trace with hash -162284531, now seen corresponding path program 118 times [2021-05-02 12:58:15,693 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:58:15,693 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1787629332] [2021-05-02 12:58:15,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:58:15,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:58:16,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:58:16,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:58:16,202 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 160 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-05-02 12:58:16,202 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:58:16,202 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1787629332] [2021-05-02 12:58:16,203 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1787629332] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:58:16,203 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [388364217] [2021-05-02 12:58:16,203 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 125 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 125 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:58:16,257 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:58:16,257 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:58:16,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 12:58:16,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:58:16,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:58:16,401 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 160 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-05-02 12:58:16,402 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [388364217] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:58:16,402 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:58:16,402 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 12:58:16,402 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863425153] [2021-05-02 12:58:16,402 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 12:58:16,402 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:58:16,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 12:58:16,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=802, Unknown=0, NotChecked=0, Total=870 [2021-05-02 12:58:16,403 INFO L87 Difference]: Start difference. First operand 259 states and 304 transitions. Second operand has 30 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 29 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:58:18,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:58:18,478 INFO L93 Difference]: Finished difference Result 296 states and 341 transitions. [2021-05-02 12:58:18,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-02 12:58:18,479 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 29 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 52 [2021-05-02 12:58:18,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:58:18,479 INFO L225 Difference]: With dead ends: 296 [2021-05-02 12:58:18,479 INFO L226 Difference]: Without dead ends: 276 [2021-05-02 12:58:18,480 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 626 ImplicationChecksByTransitivity, 1806.8ms TimeCoverageRelationStatistics Valid=275, Invalid=4015, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 12:58:18,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2021-05-02 12:58:18,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 260. [2021-05-02 12:58:18,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 260 states, 255 states have (on average 1.1803921568627451) internal successors, (301), 255 states have internal predecessors, (301), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:58:18,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 305 transitions. [2021-05-02 12:58:18,514 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 305 transitions. Word has length 52 [2021-05-02 12:58:18,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:58:18,514 INFO L480 AbstractCegarLoop]: Abstraction has 260 states and 305 transitions. [2021-05-02 12:58:18,514 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 29 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:58:18,514 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 305 transitions. [2021-05-02 12:58:18,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-02 12:58:18,515 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:58:18,515 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:58:18,716 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable138,125 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:58:18,716 INFO L428 AbstractCegarLoop]: === Iteration 128 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:58:18,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:58:18,717 INFO L82 PathProgramCache]: Analyzing trace with hash 758348159, now seen corresponding path program 119 times [2021-05-02 12:58:18,717 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:58:18,717 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [103261105] [2021-05-02 12:58:18,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:58:18,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:58:19,185 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:58:19,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:58:19,191 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 12:58:19,192 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:58:19,192 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [103261105] [2021-05-02 12:58:19,192 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [103261105] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:58:19,192 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [208109888] [2021-05-02 12:58:19,192 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 126 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 126 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:58:33,065 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2021-05-02 12:58:33,065 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:58:33,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 58 conjunts are in the unsatisfiable core [2021-05-02 12:58:33,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:58:33,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:58:33,348 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 12:58:33,348 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [208109888] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:58:33,348 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:58:33,348 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-02 12:58:33,348 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682719360] [2021-05-02 12:58:33,348 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 12:58:33,348 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:58:33,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 12:58:33,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=748, Unknown=0, NotChecked=0, Total=812 [2021-05-02 12:58:33,349 INFO L87 Difference]: Start difference. First operand 260 states and 305 transitions. Second operand has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 28 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:58:35,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:58:35,716 INFO L93 Difference]: Finished difference Result 299 states and 344 transitions. [2021-05-02 12:58:35,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 12:58:35,717 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 28 states have internal predecessors, (37), 2 states have call successors, (4), 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 52 [2021-05-02 12:58:35,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:58:35,718 INFO L225 Difference]: With dead ends: 299 [2021-05-02 12:58:35,718 INFO L226 Difference]: Without dead ends: 278 [2021-05-02 12:58:35,718 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 46 SyntacticMatches, 7 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 786 ImplicationChecksByTransitivity, 2015.4ms TimeCoverageRelationStatistics Valid=296, Invalid=4396, Unknown=0, NotChecked=0, Total=4692 [2021-05-02 12:58:35,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2021-05-02 12:58:35,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 261. [2021-05-02 12:58:35,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 256 states have (on average 1.1796875) internal successors, (302), 256 states have internal predecessors, (302), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:58:35,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 306 transitions. [2021-05-02 12:58:35,755 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 306 transitions. Word has length 52 [2021-05-02 12:58:35,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:58:35,755 INFO L480 AbstractCegarLoop]: Abstraction has 261 states and 306 transitions. [2021-05-02 12:58:35,755 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 28 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:58:35,756 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 306 transitions. [2021-05-02 12:58:35,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-02 12:58:35,756 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:58:35,756 INFO L523 BasicCegarLoop]: trace histogram [27, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:58:35,960 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 126 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable139 [2021-05-02 12:58:35,961 INFO L428 AbstractCegarLoop]: === Iteration 129 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:58:35,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:58:35,961 INFO L82 PathProgramCache]: Analyzing trace with hash -2050039585, now seen corresponding path program 120 times [2021-05-02 12:58:35,961 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:58:35,961 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2111989275] [2021-05-02 12:58:35,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:58:35,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:58:36,772 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:58:36,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:58:36,774 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 0 proven. 399 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:58:36,775 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:58:36,775 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2111989275] [2021-05-02 12:58:36,775 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2111989275] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:58:36,775 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [838918319] [2021-05-02 12:58:36,775 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 127 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 127 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:58:37,010 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 12:58:37,010 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:58:37,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 12:58:37,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:58:37,641 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2021-05-02 12:58:37,642 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [838918319] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:58:37,642 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:58:37,642 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 14] total 50 [2021-05-02 12:58:37,642 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [309738000] [2021-05-02 12:58:37,642 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 12:58:37,642 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:58:37,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 12:58:37,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=2185, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 12:58:37,643 INFO L87 Difference]: Start difference. First operand 261 states and 306 transitions. Second operand has 50 states, 50 states have (on average 1.24) internal successors, (62), 49 states have internal predecessors, (62), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:58:45,406 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 12:58:47,249 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 12:58:48,200 WARN L205 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 12:58:49,328 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 12:58:50,298 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 12:58:51,231 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 12:58:51,892 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 12:58:55,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:58:55,087 INFO L93 Difference]: Finished difference Result 429 states and 560 transitions. [2021-05-02 12:58:55,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 160 states. [2021-05-02 12:58:55,088 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.24) internal successors, (62), 49 states have internal predecessors, (62), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 52 [2021-05-02 12:58:55,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:58:55,088 INFO L225 Difference]: With dead ends: 429 [2021-05-02 12:58:55,089 INFO L226 Difference]: Without dead ends: 416 [2021-05-02 12:58:55,090 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13151 ImplicationChecksByTransitivity, 14550.0ms TimeCoverageRelationStatistics Valid=3868, Invalid=38774, Unknown=0, NotChecked=0, Total=42642 [2021-05-02 12:58:55,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 416 states. [2021-05-02 12:58:55,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 416 to 280. [2021-05-02 12:58:55,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 280 states, 275 states have (on average 1.1672727272727272) internal successors, (321), 275 states have internal predecessors, (321), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:58:55,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 325 transitions. [2021-05-02 12:58:55,127 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 325 transitions. Word has length 52 [2021-05-02 12:58:55,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:58:55,127 INFO L480 AbstractCegarLoop]: Abstraction has 280 states and 325 transitions. [2021-05-02 12:58:55,128 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 1.24) internal successors, (62), 49 states have internal predecessors, (62), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:58:55,128 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 325 transitions. [2021-05-02 12:58:55,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 12:58:55,128 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:58:55,128 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:58:55,328 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable140,127 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:58:55,329 INFO L428 AbstractCegarLoop]: === Iteration 130 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:58:55,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:58:55,329 INFO L82 PathProgramCache]: Analyzing trace with hash -867566401, now seen corresponding path program 121 times [2021-05-02 12:58:55,329 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:58:55,329 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1649799639] [2021-05-02 12:58:55,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:58:55,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:58:55,708 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:58:55,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:58:55,713 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 12:58:55,713 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:58:55,713 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1649799639] [2021-05-02 12:58:55,713 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1649799639] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:58:55,713 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [774524659] [2021-05-02 12:58:55,713 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 128 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 128 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:58:55,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:58:55,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 59 conjunts are in the unsatisfiable core [2021-05-02 12:58:55,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:58:55,896 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:58:55,898 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:58:55,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:58:55,951 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 12:58:55,951 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [774524659] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:58:55,951 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:58:55,951 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 21 [2021-05-02 12:58:55,951 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262882798] [2021-05-02 12:58:55,951 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 12:58:55,952 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:58:55,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 12:58:55,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=379, Unknown=0, NotChecked=0, Total=420 [2021-05-02 12:58:55,952 INFO L87 Difference]: Start difference. First operand 280 states and 325 transitions. Second operand has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 18 states have internal predecessors, (40), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:58:57,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:58:57,249 INFO L93 Difference]: Finished difference Result 679 states and 825 transitions. [2021-05-02 12:58:57,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 12:58:57,250 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 18 states have internal predecessors, (40), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-05-02 12:58:57,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:58:57,251 INFO L225 Difference]: With dead ends: 679 [2021-05-02 12:58:57,251 INFO L226 Difference]: Without dead ends: 660 [2021-05-02 12:58:57,252 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 64 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 872.7ms TimeCoverageRelationStatistics Valid=110, Invalid=1222, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 12:58:57,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 660 states. [2021-05-02 12:58:57,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 660 to 289. [2021-05-02 12:58:57,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 284 states have (on average 1.1690140845070423) internal successors, (332), 284 states have internal predecessors, (332), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:58:57,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 336 transitions. [2021-05-02 12:58:57,290 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 336 transitions. Word has length 53 [2021-05-02 12:58:57,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:58:57,291 INFO L480 AbstractCegarLoop]: Abstraction has 289 states and 336 transitions. [2021-05-02 12:58:57,291 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 18 states have internal predecessors, (40), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:58:57,291 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 336 transitions. [2021-05-02 12:58:57,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 12:58:57,291 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:58:57,291 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:58:57,516 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable141,128 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:58:57,517 INFO L428 AbstractCegarLoop]: === Iteration 131 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:58:57,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:58:57,517 INFO L82 PathProgramCache]: Analyzing trace with hash 741091375, now seen corresponding path program 122 times [2021-05-02 12:58:57,517 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:58:57,517 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1113387681] [2021-05-02 12:58:57,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:58:57,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:58:58,175 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:58:58,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:58:58,177 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-05-02 12:58:58,177 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:58:58,178 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1113387681] [2021-05-02 12:58:58,178 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1113387681] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:58:58,178 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [630545150] [2021-05-02 12:58:58,178 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 129 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 129 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:58:58,238 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:58:58,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:58:58,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-02 12:58:58,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:58:58,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:58:58,389 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-05-02 12:58:58,390 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [630545150] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:58:58,390 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:58:58,390 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2021-05-02 12:58:58,390 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688173910] [2021-05-02 12:58:58,390 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 12:58:58,390 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:58:58,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 12:58:58,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=859, Unknown=0, NotChecked=0, Total=930 [2021-05-02 12:58:58,391 INFO L87 Difference]: Start difference. First operand 289 states and 336 transitions. Second operand has 31 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 30 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:00,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:59:00,834 INFO L93 Difference]: Finished difference Result 326 states and 373 transitions. [2021-05-02 12:59:00,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 12:59:00,834 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 30 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-05-02 12:59:00,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:59:00,835 INFO L225 Difference]: With dead ends: 326 [2021-05-02 12:59:00,835 INFO L226 Difference]: Without dead ends: 306 [2021-05-02 12:59:00,835 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 697 ImplicationChecksByTransitivity, 2122.7ms TimeCoverageRelationStatistics Valid=292, Invalid=4400, Unknown=0, NotChecked=0, Total=4692 [2021-05-02 12:59:00,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2021-05-02 12:59:00,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 290. [2021-05-02 12:59:00,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 290 states, 285 states have (on average 1.168421052631579) internal successors, (333), 285 states have internal predecessors, (333), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:00,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 337 transitions. [2021-05-02 12:59:00,874 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 337 transitions. Word has length 53 [2021-05-02 12:59:00,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:59:00,874 INFO L480 AbstractCegarLoop]: Abstraction has 290 states and 337 transitions. [2021-05-02 12:59:00,874 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 30 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:00,874 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 337 transitions. [2021-05-02 12:59:00,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 12:59:00,874 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:59:00,874 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:59:01,075 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable143,129 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:59:01,076 INFO L428 AbstractCegarLoop]: === Iteration 132 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:59:01,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:59:01,076 INFO L82 PathProgramCache]: Analyzing trace with hash -460255617, now seen corresponding path program 123 times [2021-05-02 12:59:01,076 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:59:01,076 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [45737375] [2021-05-02 12:59:01,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:59:01,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:59:01,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:59:01,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:59:01,630 INFO L134 CoverageAnalysis]: Checked inductivity of 285 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 12:59:01,630 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:59:01,630 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [45737375] [2021-05-02 12:59:01,630 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [45737375] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:59:01,630 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [993732417] [2021-05-02 12:59:01,630 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 130 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 130 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:59:02,853 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-05-02 12:59:02,854 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:59:02,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 78 conjunts are in the unsatisfiable core [2021-05-02 12:59:02,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:59:02,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:02,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:02,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:02,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:02,884 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:02,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:02,890 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:02,892 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:02,910 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:02,911 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:02,914 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:02,915 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:02,918 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:02,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:02,923 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:02,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:03,443 INFO L134 CoverageAnalysis]: Checked inductivity of 285 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 12:59:03,443 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [993732417] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:59:03,444 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:59:03,444 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 39 [2021-05-02 12:59:03,444 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261798338] [2021-05-02 12:59:03,444 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 12:59:03,444 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:59:03,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 12:59:03,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1369, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 12:59:03,444 INFO L87 Difference]: Start difference. First operand 290 states and 337 transitions. Second operand has 39 states, 39 states have (on average 1.205128205128205) internal successors, (47), 38 states have internal predecessors, (47), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:06,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:59:06,567 INFO L93 Difference]: Finished difference Result 329 states and 376 transitions. [2021-05-02 12:59:06,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 12:59:06,568 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.205128205128205) internal successors, (47), 38 states have internal predecessors, (47), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-05-02 12:59:06,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:59:06,568 INFO L225 Difference]: With dead ends: 329 [2021-05-02 12:59:06,568 INFO L226 Difference]: Without dead ends: 308 [2021-05-02 12:59:06,569 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1352 ImplicationChecksByTransitivity, 2678.6ms TimeCoverageRelationStatistics Valid=388, Invalid=6254, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 12:59:06,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2021-05-02 12:59:06,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 291. [2021-05-02 12:59:06,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 291 states, 286 states have (on average 1.167832167832168) internal successors, (334), 286 states have internal predecessors, (334), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:06,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 338 transitions. [2021-05-02 12:59:06,616 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 338 transitions. Word has length 53 [2021-05-02 12:59:06,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:59:06,616 INFO L480 AbstractCegarLoop]: Abstraction has 291 states and 338 transitions. [2021-05-02 12:59:06,616 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.205128205128205) internal successors, (47), 38 states have internal predecessors, (47), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:06,616 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 338 transitions. [2021-05-02 12:59:06,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 12:59:06,617 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:59:06,617 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:59:06,817 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 130 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable144 [2021-05-02 12:59:06,818 INFO L428 AbstractCegarLoop]: === Iteration 133 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:59:06,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:59:06,818 INFO L82 PathProgramCache]: Analyzing trace with hash 136566383, now seen corresponding path program 124 times [2021-05-02 12:59:06,818 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:59:06,818 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1364116804] [2021-05-02 12:59:06,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:59:06,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:59:07,371 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:59:07,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:59:07,374 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-05-02 12:59:07,374 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:59:07,374 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1364116804] [2021-05-02 12:59:07,374 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1364116804] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:59:07,374 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1014979404] [2021-05-02 12:59:07,374 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 131 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 131 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:59:07,429 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:59:07,429 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:59:07,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 51 conjunts are in the unsatisfiable core [2021-05-02 12:59:07,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:59:07,531 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:07,560 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-05-02 12:59:07,560 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1014979404] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:59:07,560 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:59:07,560 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-02 12:59:07,560 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1783859461] [2021-05-02 12:59:07,560 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 12:59:07,560 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:59:07,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 12:59:07,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=749, Unknown=0, NotChecked=0, Total=812 [2021-05-02 12:59:07,561 INFO L87 Difference]: Start difference. First operand 291 states and 338 transitions. Second operand has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 28 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:10,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:59:10,282 INFO L93 Difference]: Finished difference Result 332 states and 379 transitions. [2021-05-02 12:59:10,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 12:59:10,283 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 28 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-05-02 12:59:10,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:59:10,283 INFO L225 Difference]: With dead ends: 332 [2021-05-02 12:59:10,283 INFO L226 Difference]: Without dead ends: 310 [2021-05-02 12:59:10,284 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 896 ImplicationChecksByTransitivity, 2167.5ms TimeCoverageRelationStatistics Valid=313, Invalid=4799, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 12:59:10,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2021-05-02 12:59:10,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 292. [2021-05-02 12:59:10,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 287 states have (on average 1.1672473867595818) internal successors, (335), 287 states have internal predecessors, (335), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:10,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 339 transitions. [2021-05-02 12:59:10,323 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 339 transitions. Word has length 53 [2021-05-02 12:59:10,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:59:10,323 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 339 transitions. [2021-05-02 12:59:10,323 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 28 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:10,323 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 339 transitions. [2021-05-02 12:59:10,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 12:59:10,323 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:59:10,323 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:59:10,524 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable145,131 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:59:10,524 INFO L428 AbstractCegarLoop]: === Iteration 134 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:59:10,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:59:10,524 INFO L82 PathProgramCache]: Analyzing trace with hash 480291711, now seen corresponding path program 125 times [2021-05-02 12:59:10,524 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:59:10,524 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1608959409] [2021-05-02 12:59:10,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:59:10,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:59:11,139 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:59:11,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:59:11,141 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 14 proven. 182 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 12:59:11,141 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:59:11,141 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1608959409] [2021-05-02 12:59:11,141 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1608959409] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:59:11,141 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [986860177] [2021-05-02 12:59:11,141 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 132 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 132 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:59:23,445 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-05-02 12:59:23,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:59:23,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 84 conjunts are in the unsatisfiable core [2021-05-02 12:59:23,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:59:24,141 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 14 proven. 182 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 12:59:24,141 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [986860177] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:59:24,141 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:59:24,141 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 45 [2021-05-02 12:59:24,142 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233703807] [2021-05-02 12:59:24,142 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 12:59:24,142 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:59:24,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 12:59:24,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=1865, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 12:59:24,142 INFO L87 Difference]: Start difference. First operand 292 states and 339 transitions. Second operand has 45 states, 45 states have (on average 1.2) internal successors, (54), 44 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:25,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:59:25,984 INFO L93 Difference]: Finished difference Result 311 states and 357 transitions. [2021-05-02 12:59:25,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 12:59:25,985 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.2) internal successors, (54), 44 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 54 [2021-05-02 12:59:25,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:59:25,986 INFO L225 Difference]: With dead ends: 311 [2021-05-02 12:59:25,986 INFO L226 Difference]: Without dead ends: 276 [2021-05-02 12:59:25,986 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 833 ImplicationChecksByTransitivity, 2266.2ms TimeCoverageRelationStatistics Valid=269, Invalid=4987, Unknown=0, NotChecked=0, Total=5256 [2021-05-02 12:59:25,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2021-05-02 12:59:26,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 276. [2021-05-02 12:59:26,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 276 states, 271 states have (on average 1.169741697416974) internal successors, (317), 271 states have internal predecessors, (317), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:26,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 321 transitions. [2021-05-02 12:59:26,024 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 321 transitions. Word has length 54 [2021-05-02 12:59:26,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:59:26,024 INFO L480 AbstractCegarLoop]: Abstraction has 276 states and 321 transitions. [2021-05-02 12:59:26,024 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 1.2) internal successors, (54), 44 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:26,024 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 321 transitions. [2021-05-02 12:59:26,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 12:59:26,024 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:59:26,024 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:59:26,225 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 132 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable146 [2021-05-02 12:59:26,225 INFO L428 AbstractCegarLoop]: === Iteration 135 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:59:26,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:59:26,225 INFO L82 PathProgramCache]: Analyzing trace with hash -1319026611, now seen corresponding path program 126 times [2021-05-02 12:59:26,225 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:59:26,225 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1662167842] [2021-05-02 12:59:26,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:59:26,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:59:26,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:59:26,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:59:26,870 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 183 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-05-02 12:59:26,870 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:59:26,870 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1662167842] [2021-05-02 12:59:26,870 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1662167842] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:59:26,870 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1365792814] [2021-05-02 12:59:26,870 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 133 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 133 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:59:27,953 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-05-02 12:59:27,954 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:59:27,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 93 conjunts are in the unsatisfiable core [2021-05-02 12:59:27,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:59:27,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:27,971 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:27,977 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:27,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:27,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:27,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:27,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:27,989 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:27,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:27,993 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:27,996 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:27,997 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:28,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:28,002 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:28,048 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:28,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:28,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:28,872 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 183 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-05-02 12:59:28,873 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1365792814] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:59:28,873 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:59:28,873 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 47 [2021-05-02 12:59:28,873 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22068479] [2021-05-02 12:59:28,873 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 12:59:28,873 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:59:28,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 12:59:28,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2018, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 12:59:28,874 INFO L87 Difference]: Start difference. First operand 276 states and 321 transitions. Second operand has 47 states, 47 states have (on average 1.2127659574468086) internal successors, (57), 46 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:31,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:59:31,193 INFO L93 Difference]: Finished difference Result 313 states and 358 transitions. [2021-05-02 12:59:31,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 12:59:31,194 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.2127659574468086) internal successors, (57), 46 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 54 [2021-05-02 12:59:31,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:59:31,195 INFO L225 Difference]: With dead ends: 313 [2021-05-02 12:59:31,195 INFO L226 Difference]: Without dead ends: 293 [2021-05-02 12:59:31,195 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 38 SyntacticMatches, 2 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1053 ImplicationChecksByTransitivity, 2645.4ms TimeCoverageRelationStatistics Valid=327, Invalid=5679, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 12:59:31,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2021-05-02 12:59:31,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 277. [2021-05-02 12:59:31,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 277 states, 272 states have (on average 1.1691176470588236) internal successors, (318), 272 states have internal predecessors, (318), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:31,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 322 transitions. [2021-05-02 12:59:31,238 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 322 transitions. Word has length 54 [2021-05-02 12:59:31,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:59:31,238 INFO L480 AbstractCegarLoop]: Abstraction has 277 states and 322 transitions. [2021-05-02 12:59:31,238 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 1.2127659574468086) internal successors, (57), 46 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:31,238 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 322 transitions. [2021-05-02 12:59:31,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 12:59:31,238 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:59:31,238 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:59:31,439 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 133 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable147 [2021-05-02 12:59:31,440 INFO L428 AbstractCegarLoop]: === Iteration 136 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:59:31,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:59:31,440 INFO L82 PathProgramCache]: Analyzing trace with hash 417732991, now seen corresponding path program 127 times [2021-05-02 12:59:31,440 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:59:31,440 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [378866446] [2021-05-02 12:59:31,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:59:31,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:59:32,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:59:32,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:59:32,035 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 0 proven. 175 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 12:59:32,035 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:59:32,035 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [378866446] [2021-05-02 12:59:32,035 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [378866446] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:59:32,035 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1494852447] [2021-05-02 12:59:32,035 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 134 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 134 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:59:32,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:59:32,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-02 12:59:32,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:59:32,193 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:32,221 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 0 proven. 175 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 12:59:32,222 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1494852447] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:59:32,222 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:59:32,222 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2021-05-02 12:59:32,222 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702872602] [2021-05-02 12:59:32,222 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 12:59:32,222 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:59:32,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 12:59:32,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=860, Unknown=0, NotChecked=0, Total=930 [2021-05-02 12:59:32,222 INFO L87 Difference]: Start difference. First operand 277 states and 322 transitions. Second operand has 31 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 30 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:34,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:59:34,730 INFO L93 Difference]: Finished difference Result 316 states and 361 transitions. [2021-05-02 12:59:34,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 12:59:34,731 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 30 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 54 [2021-05-02 12:59:34,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:59:34,732 INFO L225 Difference]: With dead ends: 316 [2021-05-02 12:59:34,732 INFO L226 Difference]: Without dead ends: 295 [2021-05-02 12:59:34,732 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 663 ImplicationChecksByTransitivity, 2046.6ms TimeCoverageRelationStatistics Valid=281, Invalid=4275, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 12:59:34,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 295 states. [2021-05-02 12:59:34,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 295 to 278. [2021-05-02 12:59:34,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 273 states have (on average 1.1684981684981686) internal successors, (319), 273 states have internal predecessors, (319), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:34,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 323 transitions. [2021-05-02 12:59:34,767 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 323 transitions. Word has length 54 [2021-05-02 12:59:34,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:59:34,767 INFO L480 AbstractCegarLoop]: Abstraction has 278 states and 323 transitions. [2021-05-02 12:59:34,767 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 30 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:34,767 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 323 transitions. [2021-05-02 12:59:34,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 12:59:34,767 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:59:34,767 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:59:34,968 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 134 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable148 [2021-05-02 12:59:34,968 INFO L428 AbstractCegarLoop]: === Iteration 137 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:59:34,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:59:34,968 INFO L82 PathProgramCache]: Analyzing trace with hash -1107424691, now seen corresponding path program 128 times [2021-05-02 12:59:34,968 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:59:34,968 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [274252814] [2021-05-02 12:59:34,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:59:34,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:59:35,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:59:35,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:59:35,529 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 0 proven. 172 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-05-02 12:59:35,529 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:59:35,529 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [274252814] [2021-05-02 12:59:35,529 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [274252814] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:59:35,529 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1873984405] [2021-05-02 12:59:35,529 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 135 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 135 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:59:35,588 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:59:35,588 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:59:35,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 12:59:35,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:59:35,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:35,764 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 0 proven. 172 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-05-02 12:59:35,764 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1873984405] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:59:35,764 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:59:35,765 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 12:59:35,765 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188795008] [2021-05-02 12:59:35,765 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 12:59:35,765 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:59:35,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 12:59:35,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=804, Unknown=0, NotChecked=0, Total=870 [2021-05-02 12:59:35,765 INFO L87 Difference]: Start difference. First operand 278 states and 323 transitions. Second operand has 30 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 29 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:38,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:59:38,592 INFO L93 Difference]: Finished difference Result 319 states and 364 transitions. [2021-05-02 12:59:38,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 12:59:38,593 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 29 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 54 [2021-05-02 12:59:38,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:59:38,593 INFO L225 Difference]: With dead ends: 319 [2021-05-02 12:59:38,593 INFO L226 Difference]: Without dead ends: 297 [2021-05-02 12:59:38,594 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 815 ImplicationChecksByTransitivity, 2226.6ms TimeCoverageRelationStatistics Valid=302, Invalid=4668, Unknown=0, NotChecked=0, Total=4970 [2021-05-02 12:59:38,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2021-05-02 12:59:38,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 279. [2021-05-02 12:59:38,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 274 states have (on average 1.167883211678832) internal successors, (320), 274 states have internal predecessors, (320), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:38,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 324 transitions. [2021-05-02 12:59:38,630 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 324 transitions. Word has length 54 [2021-05-02 12:59:38,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:59:38,630 INFO L480 AbstractCegarLoop]: Abstraction has 279 states and 324 transitions. [2021-05-02 12:59:38,630 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 29 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:38,630 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 324 transitions. [2021-05-02 12:59:38,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 12:59:38,630 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:59:38,631 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:59:38,832 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable149,135 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:59:38,832 INFO L428 AbstractCegarLoop]: === Iteration 138 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:59:38,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:59:38,832 INFO L82 PathProgramCache]: Analyzing trace with hash -758174737, now seen corresponding path program 129 times [2021-05-02 12:59:38,833 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:59:38,833 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1464461344] [2021-05-02 12:59:38,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:59:38,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:59:39,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:59:39,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:59:39,507 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-05-02 12:59:39,507 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:59:39,507 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1464461344] [2021-05-02 12:59:39,508 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1464461344] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:59:39,508 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [451734937] [2021-05-02 12:59:39,508 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 136 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 136 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:59:40,721 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-05-02 12:59:40,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:59:40,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 86 conjunts are in the unsatisfiable core [2021-05-02 12:59:40,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:59:41,415 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-05-02 12:59:41,416 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [451734937] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:59:41,416 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:59:41,416 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 46 [2021-05-02 12:59:41,416 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777024814] [2021-05-02 12:59:41,416 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 12:59:41,416 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:59:41,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 12:59:41,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=1927, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 12:59:41,417 INFO L87 Difference]: Start difference. First operand 279 states and 324 transitions. Second operand has 46 states, 46 states have (on average 1.173913043478261) internal successors, (54), 45 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:43,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:59:43,623 INFO L93 Difference]: Finished difference Result 316 states and 361 transitions. [2021-05-02 12:59:43,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 12:59:43,623 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.173913043478261) internal successors, (54), 45 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2021-05-02 12:59:43,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:59:43,624 INFO L225 Difference]: With dead ends: 316 [2021-05-02 12:59:43,624 INFO L226 Difference]: Without dead ends: 296 [2021-05-02 12:59:43,624 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 890 ImplicationChecksByTransitivity, 2375.5ms TimeCoverageRelationStatistics Valid=314, Invalid=5236, Unknown=0, NotChecked=0, Total=5550 [2021-05-02 12:59:43,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2021-05-02 12:59:43,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 280. [2021-05-02 12:59:43,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 280 states, 275 states have (on average 1.1672727272727272) internal successors, (321), 275 states have internal predecessors, (321), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:43,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 325 transitions. [2021-05-02 12:59:43,661 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 325 transitions. Word has length 55 [2021-05-02 12:59:43,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:59:43,661 INFO L480 AbstractCegarLoop]: Abstraction has 280 states and 325 transitions. [2021-05-02 12:59:43,661 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 1.173913043478261) internal successors, (54), 45 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:43,661 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 325 transitions. [2021-05-02 12:59:43,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 12:59:43,662 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:59:43,662 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:59:43,862 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 136 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable150 [2021-05-02 12:59:43,863 INFO L428 AbstractCegarLoop]: === Iteration 139 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:59:43,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:59:43,863 INFO L82 PathProgramCache]: Analyzing trace with hash 1865576063, now seen corresponding path program 130 times [2021-05-02 12:59:43,863 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:59:43,863 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1629786913] [2021-05-02 12:59:43,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:59:43,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:59:44,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:59:44,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:59:44,538 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 186 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 12:59:44,538 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:59:44,538 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1629786913] [2021-05-02 12:59:44,538 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1629786913] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:59:44,538 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1834380500] [2021-05-02 12:59:44,538 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 137 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 137 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:59:44,594 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:59:44,594 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:59:44,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 57 conjunts are in the unsatisfiable core [2021-05-02 12:59:44,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:59:44,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:44,755 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 186 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 12:59:44,756 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1834380500] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:59:44,756 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:59:44,756 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-02 12:59:44,756 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743398735] [2021-05-02 12:59:44,756 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 12:59:44,756 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:59:44,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 12:59:44,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=919, Unknown=0, NotChecked=0, Total=992 [2021-05-02 12:59:44,757 INFO L87 Difference]: Start difference. First operand 280 states and 325 transitions. Second operand has 32 states, 32 states have (on average 1.25) internal successors, (40), 31 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:47,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:59:47,496 INFO L93 Difference]: Finished difference Result 319 states and 364 transitions. [2021-05-02 12:59:47,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-02 12:59:47,496 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.25) internal successors, (40), 31 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2021-05-02 12:59:47,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:59:47,497 INFO L225 Difference]: With dead ends: 319 [2021-05-02 12:59:47,497 INFO L226 Difference]: Without dead ends: 298 [2021-05-02 12:59:47,498 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 736 ImplicationChecksByTransitivity, 2226.3ms TimeCoverageRelationStatistics Valid=298, Invalid=4672, Unknown=0, NotChecked=0, Total=4970 [2021-05-02 12:59:47,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2021-05-02 12:59:47,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 281. [2021-05-02 12:59:47,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 281 states, 276 states have (on average 1.1666666666666667) internal successors, (322), 276 states have internal predecessors, (322), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:47,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 281 states to 281 states and 326 transitions. [2021-05-02 12:59:47,542 INFO L78 Accepts]: Start accepts. Automaton has 281 states and 326 transitions. Word has length 55 [2021-05-02 12:59:47,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:59:47,543 INFO L480 AbstractCegarLoop]: Abstraction has 281 states and 326 transitions. [2021-05-02 12:59:47,543 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.25) internal successors, (40), 31 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:59:47,543 INFO L276 IsEmpty]: Start isEmpty. Operand 281 states and 326 transitions. [2021-05-02 12:59:47,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 12:59:47,543 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:59:47,543 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:59:47,760 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable151,137 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:59:47,760 INFO L428 AbstractCegarLoop]: === Iteration 140 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:59:47,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:59:47,761 INFO L82 PathProgramCache]: Analyzing trace with hash -1016442321, now seen corresponding path program 131 times [2021-05-02 12:59:47,761 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:59:47,761 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1462613636] [2021-05-02 12:59:47,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:59:47,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:59:48,404 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:59:48,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:59:48,407 INFO L134 CoverageAnalysis]: Checked inductivity of 317 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-05-02 12:59:48,407 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:59:48,407 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1462613636] [2021-05-02 12:59:48,407 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1462613636] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:59:48,407 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2024996416] [2021-05-02 12:59:48,407 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 138 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 138 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:59:58,614 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2021-05-02 12:59:58,614 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:59:58,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 58 conjunts are in the unsatisfiable core [2021-05-02 12:59:58,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:59:58,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:59:58,823 INFO L134 CoverageAnalysis]: Checked inductivity of 317 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-05-02 12:59:58,823 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2024996416] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:59:58,823 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:59:58,824 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2021-05-02 12:59:58,824 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213037399] [2021-05-02 12:59:58,824 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 12:59:58,824 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:59:58,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 12:59:58,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=861, Unknown=0, NotChecked=0, Total=930 [2021-05-02 12:59:58,824 INFO L87 Difference]: Start difference. First operand 281 states and 326 transitions. Second operand has 31 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 30 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:00:01,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:00:01,898 INFO L93 Difference]: Finished difference Result 322 states and 367 transitions. [2021-05-02 13:00:01,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 13:00:01,899 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 30 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2021-05-02 13:00:01,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:00:01,900 INFO L225 Difference]: With dead ends: 322 [2021-05-02 13:00:01,900 INFO L226 Difference]: Without dead ends: 300 [2021-05-02 13:00:01,901 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 53 SyntacticMatches, 3 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 942 ImplicationChecksByTransitivity, 2425.0ms TimeCoverageRelationStatistics Valid=326, Invalid=5224, Unknown=0, NotChecked=0, Total=5550 [2021-05-02 13:00:01,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 300 states. [2021-05-02 13:00:01,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 300 to 282. [2021-05-02 13:00:01,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 282 states, 277 states have (on average 1.1660649819494584) internal successors, (323), 277 states have internal predecessors, (323), 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 13:00:01,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 327 transitions. [2021-05-02 13:00:01,942 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 327 transitions. Word has length 55 [2021-05-02 13:00:01,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:00:01,942 INFO L480 AbstractCegarLoop]: Abstraction has 282 states and 327 transitions. [2021-05-02 13:00:01,942 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 30 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:00:01,943 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 327 transitions. [2021-05-02 13:00:01,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 13:00:01,943 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:00:01,943 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:00:02,143 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable152,138 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:00:02,144 INFO L428 AbstractCegarLoop]: === Iteration 141 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:00:02,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:00:02,144 INFO L82 PathProgramCache]: Analyzing trace with hash 305170495, now seen corresponding path program 132 times [2021-05-02 13:00:02,144 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:00:02,144 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1623041622] [2021-05-02 13:00:02,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:00:02,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:00:02,830 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:00:02,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:00:02,834 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-05-02 13:00:02,834 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:00:02,834 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1623041622] [2021-05-02 13:00:02,834 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1623041622] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:00:02,834 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1936095084] [2021-05-02 13:00:02,834 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 139 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 139 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:00:05,013 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2021-05-02 13:00:05,013 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:00:05,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 68 conjunts are in the unsatisfiable core [2021-05-02 13:00:05,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:00:05,504 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-05-02 13:00:05,504 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1936095084] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:00:05,504 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:00:05,504 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 37 [2021-05-02 13:00:05,504 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730936955] [2021-05-02 13:00:05,505 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 13:00:05,505 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:00:05,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 13:00:05,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1231, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 13:00:05,505 INFO L87 Difference]: Start difference. First operand 282 states and 327 transitions. Second operand has 37 states, 37 states have (on average 1.2162162162162162) internal successors, (45), 36 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:00:08,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:00:08,910 INFO L93 Difference]: Finished difference Result 325 states and 370 transitions. [2021-05-02 13:00:08,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 13:00:08,911 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.2162162162162162) internal successors, (45), 36 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2021-05-02 13:00:08,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:00:08,912 INFO L225 Difference]: With dead ends: 325 [2021-05-02 13:00:08,912 INFO L226 Difference]: Without dead ends: 302 [2021-05-02 13:00:08,912 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1301 ImplicationChecksByTransitivity, 3063.7ms TimeCoverageRelationStatistics Valid=374, Invalid=6106, Unknown=0, NotChecked=0, Total=6480 [2021-05-02 13:00:08,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2021-05-02 13:00:08,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 283. [2021-05-02 13:00:08,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 283 states, 278 states have (on average 1.1654676258992807) internal successors, (324), 278 states have internal predecessors, (324), 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 13:00:08,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 328 transitions. [2021-05-02 13:00:08,952 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 328 transitions. Word has length 55 [2021-05-02 13:00:08,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:00:08,952 INFO L480 AbstractCegarLoop]: Abstraction has 283 states and 328 transitions. [2021-05-02 13:00:08,952 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 1.2162162162162162) internal successors, (45), 36 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:00:08,952 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 328 transitions. [2021-05-02 13:00:08,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 13:00:08,953 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:00:08,953 INFO L523 BasicCegarLoop]: trace histogram [28, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:00:09,156 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable153,139 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:00:09,157 INFO L428 AbstractCegarLoop]: === Iteration 142 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:00:09,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:00:09,157 INFO L82 PathProgramCache]: Analyzing trace with hash -1557092064, now seen corresponding path program 133 times [2021-05-02 13:00:09,157 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:00:09,157 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [223831790] [2021-05-02 13:00:09,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:00:09,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:00:10,197 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:00:10,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:00:10,199 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 0 proven. 427 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 13:00:10,200 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:00:10,200 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [223831790] [2021-05-02 13:00:10,200 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [223831790] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:00:10,200 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1708803885] [2021-05-02 13:00:10,200 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 140 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 140 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:00:10,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:00:10,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 73 conjunts are in the unsatisfiable core [2021-05-02 13:00:10,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:00:10,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:10,447 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 0 proven. 427 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 13:00:10,447 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1708803885] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:00:10,448 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:00:10,448 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38] total 40 [2021-05-02 13:00:10,448 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721404932] [2021-05-02 13:00:10,448 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-02 13:00:10,448 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:00:10,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-02 13:00:10,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=1476, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 13:00:10,448 INFO L87 Difference]: Start difference. First operand 283 states and 328 transitions. Second operand has 40 states, 40 states have (on average 1.2) internal successors, (48), 39 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:00:16,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:00:16,510 INFO L93 Difference]: Finished difference Result 420 states and 526 transitions. [2021-05-02 13:00:16,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-05-02 13:00:16,511 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.2) internal successors, (48), 39 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2021-05-02 13:00:16,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:00:16,511 INFO L225 Difference]: With dead ends: 420 [2021-05-02 13:00:16,511 INFO L226 Difference]: Without dead ends: 407 [2021-05-02 13:00:16,512 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1599 ImplicationChecksByTransitivity, 3940.1ms TimeCoverageRelationStatistics Valid=396, Invalid=8916, Unknown=0, NotChecked=0, Total=9312 [2021-05-02 13:00:16,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 407 states. [2021-05-02 13:00:16,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 407 to 294. [2021-05-02 13:00:16,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 294 states, 289 states have (on average 1.166089965397924) internal successors, (337), 289 states have internal predecessors, (337), 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 13:00:16,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 341 transitions. [2021-05-02 13:00:16,557 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 341 transitions. Word has length 55 [2021-05-02 13:00:16,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:00:16,557 INFO L480 AbstractCegarLoop]: Abstraction has 294 states and 341 transitions. [2021-05-02 13:00:16,558 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 1.2) internal successors, (48), 39 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:00:16,558 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 341 transitions. [2021-05-02 13:00:16,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 13:00:16,558 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:00:16,558 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:00:16,769 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable154,140 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:00:16,770 INFO L428 AbstractCegarLoop]: === Iteration 143 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:00:16,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:00:16,770 INFO L82 PathProgramCache]: Analyzing trace with hash -551635827, now seen corresponding path program 134 times [2021-05-02 13:00:16,770 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:00:16,770 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2068233539] [2021-05-02 13:00:16,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:00:16,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:00:17,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:00:17,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:00:17,205 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-05-02 13:00:17,205 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:00:17,205 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2068233539] [2021-05-02 13:00:17,205 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2068233539] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:00:17,205 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [217538509] [2021-05-02 13:00:17,205 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 141 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 141 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:00:17,263 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:00:17,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:00:17,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 63 conjunts are in the unsatisfiable core [2021-05-02 13:00:17,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:00:17,369 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:17,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:17,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:17,436 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-05-02 13:00:17,436 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [217538509] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:00:17,436 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:00:17,436 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 22 [2021-05-02 13:00:17,436 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100445019] [2021-05-02 13:00:17,436 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 13:00:17,436 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:00:17,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 13:00:17,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=419, Unknown=0, NotChecked=0, Total=462 [2021-05-02 13:00:17,437 INFO L87 Difference]: Start difference. First operand 294 states and 341 transitions. Second operand has 22 states, 22 states have (on average 1.9090909090909092) internal successors, (42), 19 states have internal predecessors, (42), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:00:19,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:00:19,083 INFO L93 Difference]: Finished difference Result 735 states and 895 transitions. [2021-05-02 13:00:19,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 13:00:19,084 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.9090909090909092) internal successors, (42), 19 states have internal predecessors, (42), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 56 [2021-05-02 13:00:19,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:00:19,085 INFO L225 Difference]: With dead ends: 735 [2021-05-02 13:00:19,085 INFO L226 Difference]: Without dead ends: 715 [2021-05-02 13:00:19,086 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 68 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 1101.2ms TimeCoverageRelationStatistics Valid=116, Invalid=1366, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 13:00:19,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 715 states. [2021-05-02 13:00:19,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 715 to 303. [2021-05-02 13:00:19,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 303 states, 298 states have (on average 1.167785234899329) internal successors, (348), 298 states have internal predecessors, (348), 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 13:00:19,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 303 states to 303 states and 352 transitions. [2021-05-02 13:00:19,127 INFO L78 Accepts]: Start accepts. Automaton has 303 states and 352 transitions. Word has length 56 [2021-05-02 13:00:19,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:00:19,127 INFO L480 AbstractCegarLoop]: Abstraction has 303 states and 352 transitions. [2021-05-02 13:00:19,127 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 1.9090909090909092) internal successors, (42), 19 states have internal predecessors, (42), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:00:19,127 INFO L276 IsEmpty]: Start isEmpty. Operand 303 states and 352 transitions. [2021-05-02 13:00:19,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 13:00:19,128 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:00:19,128 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:00:19,328 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable155,141 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:00:19,328 INFO L428 AbstractCegarLoop]: === Iteration 144 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:00:19,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:00:19,329 INFO L82 PathProgramCache]: Analyzing trace with hash -495928961, now seen corresponding path program 135 times [2021-05-02 13:00:19,329 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:00:19,329 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1515251814] [2021-05-02 13:00:19,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:00:19,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:00:20,194 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:00:20,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:00:20,197 INFO L134 CoverageAnalysis]: Checked inductivity of 318 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 13:00:20,197 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:00:20,198 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1515251814] [2021-05-02 13:00:20,198 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1515251814] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:00:20,198 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [503105800] [2021-05-02 13:00:20,198 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 142 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 142 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:00:23,466 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-05-02 13:00:23,466 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:00:23,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 66 conjunts are in the unsatisfiable core [2021-05-02 13:00:23,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:00:23,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:23,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:23,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:23,498 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:23,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:23,631 INFO L134 CoverageAnalysis]: Checked inductivity of 318 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 13:00:23,631 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [503105800] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:00:23,631 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:00:23,631 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2021-05-02 13:00:23,631 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255715881] [2021-05-02 13:00:23,631 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 13:00:23,631 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:00:23,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 13:00:23,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=980, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 13:00:23,632 INFO L87 Difference]: Start difference. First operand 303 states and 352 transitions. Second operand has 33 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 32 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:00:26,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:00:26,847 INFO L93 Difference]: Finished difference Result 342 states and 391 transitions. [2021-05-02 13:00:26,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 13:00:26,848 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 32 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 56 [2021-05-02 13:00:26,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:00:26,849 INFO L225 Difference]: With dead ends: 342 [2021-05-02 13:00:26,849 INFO L226 Difference]: Without dead ends: 321 [2021-05-02 13:00:26,850 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 813 ImplicationChecksByTransitivity, 2694.2ms TimeCoverageRelationStatistics Valid=315, Invalid=5087, Unknown=0, NotChecked=0, Total=5402 [2021-05-02 13:00:26,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2021-05-02 13:00:26,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 304. [2021-05-02 13:00:26,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 304 states, 299 states have (on average 1.1672240802675586) internal successors, (349), 299 states have internal predecessors, (349), 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 13:00:26,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 353 transitions. [2021-05-02 13:00:26,892 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 353 transitions. Word has length 56 [2021-05-02 13:00:26,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:00:26,893 INFO L480 AbstractCegarLoop]: Abstraction has 304 states and 353 transitions. [2021-05-02 13:00:26,893 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 32 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:00:26,893 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 353 transitions. [2021-05-02 13:00:26,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 13:00:26,893 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:00:26,893 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:00:27,093 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 142 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable157 [2021-05-02 13:00:27,094 INFO L428 AbstractCegarLoop]: === Iteration 145 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:00:27,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:00:27,094 INFO L82 PathProgramCache]: Analyzing trace with hash 1804011149, now seen corresponding path program 136 times [2021-05-02 13:00:27,094 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:00:27,094 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1456285240] [2021-05-02 13:00:27,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:00:27,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:00:27,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:00:27,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:00:27,827 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 0 proven. 191 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-05-02 13:00:27,827 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:00:27,827 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1456285240] [2021-05-02 13:00:27,827 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1456285240] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:00:27,827 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1333758285] [2021-05-02 13:00:27,827 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 143 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 143 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:00:27,885 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:00:27,885 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:00:27,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 57 conjunts are in the unsatisfiable core [2021-05-02 13:00:27,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:00:28,063 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:28,100 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 0 proven. 191 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-05-02 13:00:28,101 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1333758285] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:00:28,101 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:00:28,101 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-02 13:00:28,101 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1393598896] [2021-05-02 13:00:28,101 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 13:00:28,101 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:00:28,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 13:00:28,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=920, Unknown=0, NotChecked=0, Total=992 [2021-05-02 13:00:28,102 INFO L87 Difference]: Start difference. First operand 304 states and 353 transitions. Second operand has 32 states, 32 states have (on average 1.25) internal successors, (40), 31 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:00:31,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:00:31,638 INFO L93 Difference]: Finished difference Result 345 states and 394 transitions. [2021-05-02 13:00:31,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 13:00:31,639 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.25) internal successors, (40), 31 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 56 [2021-05-02 13:00:31,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:00:31,640 INFO L225 Difference]: With dead ends: 345 [2021-05-02 13:00:31,640 INFO L226 Difference]: Without dead ends: 323 [2021-05-02 13:00:31,640 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1070 ImplicationChecksByTransitivity, 2808.1ms TimeCoverageRelationStatistics Valid=350, Invalid=5812, Unknown=0, NotChecked=0, Total=6162 [2021-05-02 13:00:31,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2021-05-02 13:00:31,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 305. [2021-05-02 13:00:31,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 305 states, 300 states have (on average 1.1666666666666667) internal successors, (350), 300 states have internal predecessors, (350), 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 13:00:31,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 354 transitions. [2021-05-02 13:00:31,683 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 354 transitions. Word has length 56 [2021-05-02 13:00:31,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:00:31,683 INFO L480 AbstractCegarLoop]: Abstraction has 305 states and 354 transitions. [2021-05-02 13:00:31,683 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.25) internal successors, (40), 31 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:00:31,683 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 354 transitions. [2021-05-02 13:00:31,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 13:00:31,684 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:00:31,684 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:00:31,884 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 143 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable158 [2021-05-02 13:00:31,884 INFO L428 AbstractCegarLoop]: === Iteration 146 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:00:31,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:00:31,885 INFO L82 PathProgramCache]: Analyzing trace with hash 1768763263, now seen corresponding path program 137 times [2021-05-02 13:00:31,885 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:00:31,885 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [382178531] [2021-05-02 13:00:31,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:00:31,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:00:32,563 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:00:32,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:00:32,566 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 189 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-05-02 13:00:32,566 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:00:32,566 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [382178531] [2021-05-02 13:00:32,566 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [382178531] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:00:32,566 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1298105614] [2021-05-02 13:00:32,566 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 144 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 144 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:00:46,098 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-05-02 13:00:46,099 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:00:46,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 104 conjunts are in the unsatisfiable core [2021-05-02 13:00:46,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:00:46,202 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:46,204 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:46,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:46,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:46,213 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:46,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:46,268 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:46,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:46,319 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:46,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:46,325 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:46,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:46,329 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:46,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:46,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:46,335 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:46,642 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:00:46,674 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 189 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-05-02 13:00:46,674 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1298105614] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:00:46,674 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:00:46,675 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 34 [2021-05-02 13:00:46,675 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731574140] [2021-05-02 13:00:46,675 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 13:00:46,675 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:00:46,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 13:00:46,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=1045, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 13:00:46,675 INFO L87 Difference]: Start difference. First operand 305 states and 354 transitions. Second operand has 34 states, 34 states have (on average 1.3235294117647058) internal successors, (45), 33 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:00:50,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:00:50,500 INFO L93 Difference]: Finished difference Result 348 states and 397 transitions. [2021-05-02 13:00:50,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-02 13:00:50,501 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.3235294117647058) internal successors, (45), 33 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 56 [2021-05-02 13:00:50,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:00:50,502 INFO L225 Difference]: With dead ends: 348 [2021-05-02 13:00:50,502 INFO L226 Difference]: Without dead ends: 325 [2021-05-02 13:00:50,502 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 46 SyntacticMatches, 8 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1459 ImplicationChecksByTransitivity, 3299.2ms TimeCoverageRelationStatistics Valid=377, Invalid=6763, Unknown=0, NotChecked=0, Total=7140 [2021-05-02 13:00:50,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 325 states. [2021-05-02 13:00:50,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 325 to 306. [2021-05-02 13:00:50,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 301 states have (on average 1.1661129568106312) internal successors, (351), 301 states have internal predecessors, (351), 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 13:00:50,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 355 transitions. [2021-05-02 13:00:50,546 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 355 transitions. Word has length 56 [2021-05-02 13:00:50,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:00:50,547 INFO L480 AbstractCegarLoop]: Abstraction has 306 states and 355 transitions. [2021-05-02 13:00:50,547 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 1.3235294117647058) internal successors, (45), 33 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:00:50,547 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 355 transitions. [2021-05-02 13:00:50,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 13:00:50,547 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:00:50,547 INFO L523 BasicCegarLoop]: trace histogram [29, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:00:50,747 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable159,144 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:00:50,748 INFO L428 AbstractCegarLoop]: === Iteration 147 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:00:50,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:00:50,748 INFO L82 PathProgramCache]: Analyzing trace with hash 147603167, now seen corresponding path program 138 times [2021-05-02 13:00:50,748 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:00:50,748 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [790435619] [2021-05-02 13:00:50,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:00:50,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:00:51,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:00:51,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:00:51,865 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 456 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 13:00:51,865 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:00:51,865 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [790435619] [2021-05-02 13:00:51,865 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [790435619] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:00:51,865 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [921428584] [2021-05-02 13:00:51,865 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 145 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 145 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:00:52,517 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-05-02 13:00:52,517 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:00:52,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 13:00:52,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:00:53,530 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2021-05-02 13:00:53,530 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [921428584] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:00:53,530 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:00:53,530 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 16] total 54 [2021-05-02 13:00:53,530 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412583255] [2021-05-02 13:00:53,530 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-02 13:00:53,530 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:00:53,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-02 13:00:53,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=2744, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 13:00:53,531 INFO L87 Difference]: Start difference. First operand 306 states and 355 transitions. Second operand has 54 states, 54 states have (on average 1.2037037037037037) internal successors, (65), 53 states have internal predecessors, (65), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:11,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:11,516 INFO L93 Difference]: Finished difference Result 466 states and 586 transitions. [2021-05-02 13:01:11,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 160 states. [2021-05-02 13:01:11,517 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.2037037037037037) internal successors, (65), 53 states have internal predecessors, (65), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 56 [2021-05-02 13:01:11,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:11,517 INFO L225 Difference]: With dead ends: 466 [2021-05-02 13:01:11,517 INFO L226 Difference]: Without dead ends: 446 [2021-05-02 13:01:11,519 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 209 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12163 ImplicationChecksByTransitivity, 12763.9ms TimeCoverageRelationStatistics Valid=1154, Invalid=43156, Unknown=0, NotChecked=0, Total=44310 [2021-05-02 13:01:11,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 446 states. [2021-05-02 13:01:11,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 446 to 316. [2021-05-02 13:01:11,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 311 states have (on average 1.1639871382636655) internal successors, (362), 311 states have internal predecessors, (362), 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 13:01:11,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 366 transitions. [2021-05-02 13:01:11,562 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 366 transitions. Word has length 56 [2021-05-02 13:01:11,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:11,562 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 366 transitions. [2021-05-02 13:01:11,562 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 1.2037037037037037) internal successors, (65), 53 states have internal predecessors, (65), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:11,562 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 366 transitions. [2021-05-02 13:01:11,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 13:01:11,563 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:11,563 INFO L523 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:11,763 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 145 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable160 [2021-05-02 13:01:11,763 INFO L428 AbstractCegarLoop]: === Iteration 148 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:11,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:11,764 INFO L82 PathProgramCache]: Analyzing trace with hash 1556103087, now seen corresponding path program 139 times [2021-05-02 13:01:11,764 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:11,764 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1362513373] [2021-05-02 13:01:11,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:11,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:12,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:12,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:12,618 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 15 proven. 210 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-05-02 13:01:12,618 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:12,618 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1362513373] [2021-05-02 13:01:12,618 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1362513373] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:12,618 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [859644588] [2021-05-02 13:01:12,618 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 146 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 146 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:12,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:12,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 90 conjunts are in the unsatisfiable core [2021-05-02 13:01:12,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:13,595 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 15 proven. 210 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-05-02 13:01:13,595 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [859644588] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:13,595 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:13,595 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 48 [2021-05-02 13:01:13,595 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385768460] [2021-05-02 13:01:13,595 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-02 13:01:13,595 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:13,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-02 13:01:13,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=2133, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 13:01:13,596 INFO L87 Difference]: Start difference. First operand 316 states and 366 transitions. Second operand has 48 states, 48 states have (on average 1.1875) internal successors, (57), 47 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:16,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:16,029 INFO L93 Difference]: Finished difference Result 336 states and 385 transitions. [2021-05-02 13:01:16,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 13:01:16,030 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.1875) internal successors, (57), 47 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2021-05-02 13:01:16,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:16,030 INFO L225 Difference]: With dead ends: 336 [2021-05-02 13:01:16,030 INFO L226 Difference]: Without dead ends: 299 [2021-05-02 13:01:16,031 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 960 ImplicationChecksByTransitivity, 2935.9ms TimeCoverageRelationStatistics Valid=288, Invalid=5718, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 13:01:16,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2021-05-02 13:01:16,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 299. [2021-05-02 13:01:16,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 299 states, 294 states have (on average 1.1666666666666667) internal successors, (343), 294 states have internal predecessors, (343), 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 13:01:16,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 347 transitions. [2021-05-02 13:01:16,069 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 347 transitions. Word has length 57 [2021-05-02 13:01:16,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:16,069 INFO L480 AbstractCegarLoop]: Abstraction has 299 states and 347 transitions. [2021-05-02 13:01:16,069 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 1.1875) internal successors, (57), 47 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:16,069 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 347 transitions. [2021-05-02 13:01:16,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 13:01:16,069 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:16,069 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:16,269 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable161,146 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:16,270 INFO L428 AbstractCegarLoop]: === Iteration 149 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:16,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:16,270 INFO L82 PathProgramCache]: Analyzing trace with hash -688140673, now seen corresponding path program 140 times [2021-05-02 13:01:16,270 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:16,270 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [324592666] [2021-05-02 13:01:16,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:16,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:17,066 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:17,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:17,069 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 211 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 13:01:17,069 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:17,069 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [324592666] [2021-05-02 13:01:17,069 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [324592666] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:17,069 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1837515213] [2021-05-02 13:01:17,069 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 147 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 147 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:17,127 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:01:17,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:17,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 88 conjunts are in the unsatisfiable core [2021-05-02 13:01:17,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:17,978 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 211 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 13:01:17,978 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1837515213] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:17,978 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:17,978 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 47 [2021-05-02 13:01:17,978 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597637476] [2021-05-02 13:01:17,978 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 13:01:17,978 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:17,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 13:01:17,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=2017, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 13:01:17,979 INFO L87 Difference]: Start difference. First operand 299 states and 347 transitions. Second operand has 47 states, 47 states have (on average 1.1702127659574468) internal successors, (55), 46 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:20,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:20,711 INFO L93 Difference]: Finished difference Result 338 states and 386 transitions. [2021-05-02 13:01:20,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 13:01:20,712 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.1702127659574468) internal successors, (55), 46 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2021-05-02 13:01:20,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:20,713 INFO L225 Difference]: With dead ends: 338 [2021-05-02 13:01:20,713 INFO L226 Difference]: Without dead ends: 317 [2021-05-02 13:01:20,713 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 933 ImplicationChecksByTransitivity, 2828.7ms TimeCoverageRelationStatistics Valid=320, Invalid=5532, Unknown=0, NotChecked=0, Total=5852 [2021-05-02 13:01:20,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2021-05-02 13:01:20,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 300. [2021-05-02 13:01:20,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 300 states, 295 states have (on average 1.1661016949152543) internal successors, (344), 295 states have internal predecessors, (344), 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 13:01:20,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 348 transitions. [2021-05-02 13:01:20,750 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 348 transitions. Word has length 57 [2021-05-02 13:01:20,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:20,751 INFO L480 AbstractCegarLoop]: Abstraction has 300 states and 348 transitions. [2021-05-02 13:01:20,751 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 1.1702127659574468) internal successors, (55), 46 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:20,751 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 348 transitions. [2021-05-02 13:01:20,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 13:01:20,751 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:20,751 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:20,951 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable162,147 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:20,951 INFO L428 AbstractCegarLoop]: === Iteration 150 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:20,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:20,952 INFO L82 PathProgramCache]: Analyzing trace with hash -956244497, now seen corresponding path program 141 times [2021-05-02 13:01:20,952 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:20,952 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1323094582] [2021-05-02 13:01:20,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:20,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:21,788 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:21,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:21,791 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 202 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-05-02 13:01:21,791 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:21,791 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1323094582] [2021-05-02 13:01:21,791 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1323094582] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:21,791 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [535610767] [2021-05-02 13:01:21,791 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 148 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 148 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:23,914 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-05-02 13:01:23,915 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:23,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 67 conjunts are in the unsatisfiable core [2021-05-02 13:01:23,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:24,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:24,086 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 202 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-05-02 13:01:24,087 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [535610767] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:24,087 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:24,087 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2021-05-02 13:01:24,087 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [557956217] [2021-05-02 13:01:24,087 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 13:01:24,087 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:24,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 13:01:24,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=981, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 13:01:24,088 INFO L87 Difference]: Start difference. First operand 300 states and 348 transitions. Second operand has 33 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 32 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:27,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:27,384 INFO L93 Difference]: Finished difference Result 341 states and 389 transitions. [2021-05-02 13:01:27,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 13:01:27,385 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 32 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2021-05-02 13:01:27,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:27,385 INFO L225 Difference]: With dead ends: 341 [2021-05-02 13:01:27,385 INFO L226 Difference]: Without dead ends: 319 [2021-05-02 13:01:27,386 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 776 ImplicationChecksByTransitivity, 2640.8ms TimeCoverageRelationStatistics Valid=304, Invalid=4952, Unknown=0, NotChecked=0, Total=5256 [2021-05-02 13:01:27,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2021-05-02 13:01:27,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 301. [2021-05-02 13:01:27,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 301 states, 296 states have (on average 1.1655405405405406) internal successors, (345), 296 states have internal predecessors, (345), 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 13:01:27,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 349 transitions. [2021-05-02 13:01:27,434 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 349 transitions. Word has length 57 [2021-05-02 13:01:27,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:27,434 INFO L480 AbstractCegarLoop]: Abstraction has 301 states and 349 transitions. [2021-05-02 13:01:27,434 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 32 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:27,434 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 349 transitions. [2021-05-02 13:01:27,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 13:01:27,434 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:27,434 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:27,635 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable163,148 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:27,635 INFO L428 AbstractCegarLoop]: === Iteration 151 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:27,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:27,635 INFO L82 PathProgramCache]: Analyzing trace with hash -104501185, now seen corresponding path program 142 times [2021-05-02 13:01:27,635 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:27,635 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534562790] [2021-05-02 13:01:27,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:27,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:28,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:28,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:28,375 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-05-02 13:01:28,375 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:28,375 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534562790] [2021-05-02 13:01:28,375 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [534562790] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:28,375 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1200451039] [2021-05-02 13:01:28,375 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 149 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 149 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:28,434 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:01:28,435 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:28,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 57 conjunts are in the unsatisfiable core [2021-05-02 13:01:28,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:28,562 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:28,597 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-05-02 13:01:28,597 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1200451039] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:28,597 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:28,597 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-02 13:01:28,597 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842140183] [2021-05-02 13:01:28,597 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 13:01:28,598 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:28,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 13:01:28,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=921, Unknown=0, NotChecked=0, Total=992 [2021-05-02 13:01:28,598 INFO L87 Difference]: Start difference. First operand 301 states and 349 transitions. Second operand has 32 states, 32 states have (on average 1.25) internal successors, (40), 31 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:32,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:32,141 INFO L93 Difference]: Finished difference Result 344 states and 392 transitions. [2021-05-02 13:01:32,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-02 13:01:32,142 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.25) internal successors, (40), 31 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2021-05-02 13:01:32,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:32,142 INFO L225 Difference]: With dead ends: 344 [2021-05-02 13:01:32,142 INFO L226 Difference]: Without dead ends: 321 [2021-05-02 13:01:32,143 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 983 ImplicationChecksByTransitivity, 2732.1ms TimeCoverageRelationStatistics Valid=332, Invalid=5520, Unknown=0, NotChecked=0, Total=5852 [2021-05-02 13:01:32,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2021-05-02 13:01:32,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 302. [2021-05-02 13:01:32,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 302 states, 297 states have (on average 1.164983164983165) internal successors, (346), 297 states have internal predecessors, (346), 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 13:01:32,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 350 transitions. [2021-05-02 13:01:32,181 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 350 transitions. Word has length 57 [2021-05-02 13:01:32,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:32,181 INFO L480 AbstractCegarLoop]: Abstraction has 302 states and 350 transitions. [2021-05-02 13:01:32,181 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.25) internal successors, (40), 31 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:32,182 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 350 transitions. [2021-05-02 13:01:32,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 13:01:32,182 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:32,182 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:32,384 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable164,149 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:32,385 INFO L428 AbstractCegarLoop]: === Iteration 152 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:32,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:32,385 INFO L82 PathProgramCache]: Analyzing trace with hash -2084176849, now seen corresponding path program 143 times [2021-05-02 13:01:32,385 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:32,385 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [648790507] [2021-05-02 13:01:32,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:32,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:33,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:33,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:33,077 INFO L134 CoverageAnalysis]: Checked inductivity of 370 backedges. 0 proven. 199 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2021-05-02 13:01:33,077 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:33,077 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [648790507] [2021-05-02 13:01:33,077 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [648790507] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:33,077 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [454009383] [2021-05-02 13:01:33,077 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 150 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 150 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:43,116 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-05-02 13:01:43,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:43,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 73 conjunts are in the unsatisfiable core [2021-05-02 13:01:43,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:43,706 INFO L134 CoverageAnalysis]: Checked inductivity of 370 backedges. 0 proven. 199 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2021-05-02 13:01:43,706 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [454009383] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:43,707 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:43,707 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 38 [2021-05-02 13:01:43,707 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139684239] [2021-05-02 13:01:43,707 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 13:01:43,707 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:43,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 13:01:43,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=1303, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 13:01:43,708 INFO L87 Difference]: Start difference. First operand 302 states and 350 transitions. Second operand has 38 states, 38 states have (on average 1.2105263157894737) internal successors, (46), 37 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:47,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:47,457 INFO L93 Difference]: Finished difference Result 347 states and 395 transitions. [2021-05-02 13:01:47,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-02 13:01:47,458 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.2105263157894737) internal successors, (46), 37 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2021-05-02 13:01:47,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:47,459 INFO L225 Difference]: With dead ends: 347 [2021-05-02 13:01:47,459 INFO L226 Difference]: Without dead ends: 323 [2021-05-02 13:01:47,459 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1353 ImplicationChecksByTransitivity, 3189.3ms TimeCoverageRelationStatistics Valid=380, Invalid=6426, Unknown=0, NotChecked=0, Total=6806 [2021-05-02 13:01:47,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2021-05-02 13:01:47,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 303. [2021-05-02 13:01:47,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 303 states, 298 states have (on average 1.1644295302013423) internal successors, (347), 298 states have internal predecessors, (347), 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 13:01:47,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 303 states to 303 states and 351 transitions. [2021-05-02 13:01:47,499 INFO L78 Accepts]: Start accepts. Automaton has 303 states and 351 transitions. Word has length 57 [2021-05-02 13:01:47,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:47,499 INFO L480 AbstractCegarLoop]: Abstraction has 303 states and 351 transitions. [2021-05-02 13:01:47,499 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 1.2105263157894737) internal successors, (46), 37 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:47,499 INFO L276 IsEmpty]: Start isEmpty. Operand 303 states and 351 transitions. [2021-05-02 13:01:47,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 13:01:47,499 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:47,499 INFO L523 BasicCegarLoop]: trace histogram [30, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:47,700 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 150 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable165 [2021-05-02 13:01:47,700 INFO L428 AbstractCegarLoop]: === Iteration 153 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:47,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:47,701 INFO L82 PathProgramCache]: Analyzing trace with hash -811333585, now seen corresponding path program 144 times [2021-05-02 13:01:47,701 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:47,701 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1464329843] [2021-05-02 13:01:47,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:47,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:49,024 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:49,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:49,027 INFO L134 CoverageAnalysis]: Checked inductivity of 514 backedges. 0 proven. 493 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-05-02 13:01:49,027 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:49,027 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1464329843] [2021-05-02 13:01:49,027 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1464329843] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:49,027 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2145251013] [2021-05-02 13:01:49,027 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 151 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 151 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:49,465 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-05-02 13:01:49,465 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:49,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 13:01:49,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:50,625 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:50,633 INFO L134 CoverageAnalysis]: Checked inductivity of 514 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2021-05-02 13:01:50,634 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2145251013] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:50,634 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:50,634 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 17] total 57 [2021-05-02 13:01:50,634 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699122594] [2021-05-02 13:01:50,634 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-02 13:01:50,634 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:50,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-02 13:01:50,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=3067, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 13:01:50,635 INFO L87 Difference]: Start difference. First operand 303 states and 351 transitions. Second operand has 57 states, 57 states have (on average 1.1929824561403508) internal successors, (68), 56 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:12,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:12,334 INFO L93 Difference]: Finished difference Result 494 states and 625 transitions. [2021-05-02 13:02:12,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 177 states. [2021-05-02 13:02:12,335 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.1929824561403508) internal successors, (68), 56 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2021-05-02 13:02:12,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:12,336 INFO L225 Difference]: With dead ends: 494 [2021-05-02 13:02:12,336 INFO L226 Difference]: Without dead ends: 450 [2021-05-02 13:02:12,338 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 229 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14953 ImplicationChecksByTransitivity, 15235.6ms TimeCoverageRelationStatistics Valid=1290, Invalid=51840, Unknown=0, NotChecked=0, Total=53130 [2021-05-02 13:02:12,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 450 states. [2021-05-02 13:02:12,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 450 to 322. [2021-05-02 13:02:12,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 317 states have (on average 1.160883280757098) internal successors, (368), 317 states have internal predecessors, (368), 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 13:02:12,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 372 transitions. [2021-05-02 13:02:12,382 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 372 transitions. Word has length 57 [2021-05-02 13:02:12,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:12,382 INFO L480 AbstractCegarLoop]: Abstraction has 322 states and 372 transitions. [2021-05-02 13:02:12,383 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 1.1929824561403508) internal successors, (68), 56 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:12,383 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 372 transitions. [2021-05-02 13:02:12,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 13:02:12,383 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:12,383 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:12,583 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 151 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable166 [2021-05-02 13:02:12,583 INFO L428 AbstractCegarLoop]: === Iteration 154 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:12,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:12,584 INFO L82 PathProgramCache]: Analyzing trace with hash 1943230847, now seen corresponding path program 145 times [2021-05-02 13:02:12,584 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:12,584 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [87492657] [2021-05-02 13:02:12,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:12,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:13,567 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:13,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:13,570 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 13:02:13,570 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:13,570 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [87492657] [2021-05-02 13:02:13,570 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [87492657] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:13,570 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [541241447] [2021-05-02 13:02:13,570 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 152 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 152 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:13,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:13,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 92 conjunts are in the unsatisfiable core [2021-05-02 13:02:13,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:14,653 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 13:02:14,654 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [541241447] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:14,654 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:14,654 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 49 [2021-05-02 13:02:14,654 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615551512] [2021-05-02 13:02:14,654 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 13:02:14,654 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:14,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 13:02:14,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=2199, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 13:02:14,654 INFO L87 Difference]: Start difference. First operand 322 states and 372 transitions. Second operand has 49 states, 49 states have (on average 1.163265306122449) internal successors, (57), 48 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:17,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:17,779 INFO L93 Difference]: Finished difference Result 361 states and 411 transitions. [2021-05-02 13:02:17,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 13:02:17,780 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.163265306122449) internal successors, (57), 48 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 58 [2021-05-02 13:02:17,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:17,780 INFO L225 Difference]: With dead ends: 361 [2021-05-02 13:02:17,780 INFO L226 Difference]: Without dead ends: 340 [2021-05-02 13:02:17,781 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1021 ImplicationChecksByTransitivity, 3416.3ms TimeCoverageRelationStatistics Valid=336, Invalid=5984, Unknown=0, NotChecked=0, Total=6320 [2021-05-02 13:02:17,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2021-05-02 13:02:17,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 323. [2021-05-02 13:02:17,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 323 states, 318 states have (on average 1.1603773584905661) internal successors, (369), 318 states have internal predecessors, (369), 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 13:02:17,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 373 transitions. [2021-05-02 13:02:17,826 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 373 transitions. Word has length 58 [2021-05-02 13:02:17,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:17,826 INFO L480 AbstractCegarLoop]: Abstraction has 323 states and 373 transitions. [2021-05-02 13:02:17,826 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 1.163265306122449) internal successors, (57), 48 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:17,826 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 373 transitions. [2021-05-02 13:02:17,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 13:02:17,826 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:17,826 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:18,026 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 152 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable167 [2021-05-02 13:02:18,027 INFO L428 AbstractCegarLoop]: === Iteration 155 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:18,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:18,027 INFO L82 PathProgramCache]: Analyzing trace with hash -624823603, now seen corresponding path program 146 times [2021-05-02 13:02:18,027 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:18,027 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [270870708] [2021-05-02 13:02:18,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:18,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:18,909 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:18,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:18,911 INFO L134 CoverageAnalysis]: Checked inductivity of 350 backedges. 0 proven. 214 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-05-02 13:02:18,912 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:18,912 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [270870708] [2021-05-02 13:02:18,912 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [270870708] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:18,912 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1477253433] [2021-05-02 13:02:18,912 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 153 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 153 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:18,970 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:02:18,971 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:18,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 61 conjunts are in the unsatisfiable core [2021-05-02 13:02:18,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:19,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:19,150 INFO L134 CoverageAnalysis]: Checked inductivity of 350 backedges. 0 proven. 214 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-05-02 13:02:19,150 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1477253433] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:19,150 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:19,150 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2021-05-02 13:02:19,150 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [545010070] [2021-05-02 13:02:19,150 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 13:02:19,150 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:19,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 13:02:19,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=1044, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 13:02:19,151 INFO L87 Difference]: Start difference. First operand 323 states and 373 transitions. Second operand has 34 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 33 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:22,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:22,530 INFO L93 Difference]: Finished difference Result 364 states and 414 transitions. [2021-05-02 13:02:22,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 13:02:22,531 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 33 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 58 [2021-05-02 13:02:22,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:22,532 INFO L225 Difference]: With dead ends: 364 [2021-05-02 13:02:22,532 INFO L226 Difference]: Without dead ends: 342 [2021-05-02 13:02:22,532 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 855 ImplicationChecksByTransitivity, 2967.3ms TimeCoverageRelationStatistics Valid=321, Invalid=5379, Unknown=0, NotChecked=0, Total=5700 [2021-05-02 13:02:22,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342 states. [2021-05-02 13:02:22,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342 to 324. [2021-05-02 13:02:22,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 324 states, 319 states have (on average 1.1598746081504703) internal successors, (370), 319 states have internal predecessors, (370), 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 13:02:22,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 324 states to 324 states and 374 transitions. [2021-05-02 13:02:22,587 INFO L78 Accepts]: Start accepts. Automaton has 324 states and 374 transitions. Word has length 58 [2021-05-02 13:02:22,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:22,587 INFO L480 AbstractCegarLoop]: Abstraction has 324 states and 374 transitions. [2021-05-02 13:02:22,587 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 33 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:22,587 INFO L276 IsEmpty]: Start isEmpty. Operand 324 states and 374 transitions. [2021-05-02 13:02:22,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 13:02:22,587 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:22,587 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:22,788 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 153 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable168 [2021-05-02 13:02:22,788 INFO L428 AbstractCegarLoop]: === Iteration 156 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:22,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:22,788 INFO L82 PathProgramCache]: Analyzing trace with hash 1953843071, now seen corresponding path program 147 times [2021-05-02 13:02:22,788 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:22,788 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [93889657] [2021-05-02 13:02:22,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:22,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:23,614 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:23,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:23,617 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 208 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-05-02 13:02:23,617 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:23,617 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [93889657] [2021-05-02 13:02:23,617 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [93889657] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:23,617 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1933036157] [2021-05-02 13:02:23,618 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 154 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 154 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:27,023 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-02 13:02:27,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:27,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 62 conjunts are in the unsatisfiable core [2021-05-02 13:02:27,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:27,784 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 208 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-05-02 13:02:27,785 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1933036157] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:27,785 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:27,785 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 43 [2021-05-02 13:02:27,785 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139005743] [2021-05-02 13:02:27,785 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 13:02:27,785 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:27,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 13:02:27,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1681, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 13:02:27,785 INFO L87 Difference]: Start difference. First operand 324 states and 374 transitions. Second operand has 43 states, 43 states have (on average 1.186046511627907) internal successors, (51), 42 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:31,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:31,759 INFO L93 Difference]: Finished difference Result 367 states and 417 transitions. [2021-05-02 13:02:31,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 13:02:31,761 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.186046511627907) internal successors, (51), 42 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 58 [2021-05-02 13:02:31,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:31,761 INFO L225 Difference]: With dead ends: 367 [2021-05-02 13:02:31,761 INFO L226 Difference]: Without dead ends: 344 [2021-05-02 13:02:31,762 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1682 ImplicationChecksByTransitivity, 3790.5ms TimeCoverageRelationStatistics Valid=432, Invalid=7758, Unknown=0, NotChecked=0, Total=8190 [2021-05-02 13:02:31,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2021-05-02 13:02:31,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 325. [2021-05-02 13:02:31,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 325 states, 320 states have (on average 1.159375) internal successors, (371), 320 states have internal predecessors, (371), 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 13:02:31,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 325 states to 325 states and 375 transitions. [2021-05-02 13:02:31,808 INFO L78 Accepts]: Start accepts. Automaton has 325 states and 375 transitions. Word has length 58 [2021-05-02 13:02:31,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:31,808 INFO L480 AbstractCegarLoop]: Abstraction has 325 states and 375 transitions. [2021-05-02 13:02:31,808 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 1.186046511627907) internal successors, (51), 42 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:31,808 INFO L276 IsEmpty]: Start isEmpty. Operand 325 states and 375 transitions. [2021-05-02 13:02:31,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 13:02:31,809 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:31,809 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:32,009 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 154 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable169 [2021-05-02 13:02:32,009 INFO L428 AbstractCegarLoop]: === Iteration 157 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:32,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:32,009 INFO L82 PathProgramCache]: Analyzing trace with hash 861158605, now seen corresponding path program 148 times [2021-05-02 13:02:32,009 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:32,010 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [187036665] [2021-05-02 13:02:32,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:32,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:32,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:32,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:32,816 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2021-05-02 13:02:32,816 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:32,816 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [187036665] [2021-05-02 13:02:32,816 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [187036665] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:32,816 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2133167492] [2021-05-02 13:02:32,816 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 155 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 155 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:32,884 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:02:32,884 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:32,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 74 conjunts are in the unsatisfiable core [2021-05-02 13:02:32,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:33,491 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2021-05-02 13:02:33,492 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2133167492] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:33,492 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:33,492 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 40 [2021-05-02 13:02:33,492 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [419213197] [2021-05-02 13:02:33,492 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-02 13:02:33,492 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:33,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-02 13:02:33,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1449, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 13:02:33,492 INFO L87 Difference]: Start difference. First operand 325 states and 375 transitions. Second operand has 40 states, 40 states have (on average 1.2) internal successors, (48), 39 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:37,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:37,932 INFO L93 Difference]: Finished difference Result 370 states and 420 transitions. [2021-05-02 13:02:37,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-02 13:02:37,933 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.2) internal successors, (48), 39 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 58 [2021-05-02 13:02:37,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:37,933 INFO L225 Difference]: With dead ends: 370 [2021-05-02 13:02:37,933 INFO L226 Difference]: Without dead ends: 346 [2021-05-02 13:02:37,934 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1624 ImplicationChecksByTransitivity, 3707.0ms TimeCoverageRelationStatistics Valid=420, Invalid=7412, Unknown=0, NotChecked=0, Total=7832 [2021-05-02 13:02:37,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2021-05-02 13:02:37,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 326. [2021-05-02 13:02:37,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 326 states, 321 states have (on average 1.158878504672897) internal successors, (372), 321 states have internal predecessors, (372), 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 13:02:37,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 326 states to 326 states and 376 transitions. [2021-05-02 13:02:37,980 INFO L78 Accepts]: Start accepts. Automaton has 326 states and 376 transitions. Word has length 58 [2021-05-02 13:02:37,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:37,980 INFO L480 AbstractCegarLoop]: Abstraction has 326 states and 376 transitions. [2021-05-02 13:02:37,980 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 1.2) internal successors, (48), 39 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:37,980 INFO L276 IsEmpty]: Start isEmpty. Operand 326 states and 376 transitions. [2021-05-02 13:02:37,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 13:02:37,980 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:37,981 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:38,181 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 155 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable170 [2021-05-02 13:02:38,181 INFO L428 AbstractCegarLoop]: === Iteration 158 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:38,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:38,181 INFO L82 PathProgramCache]: Analyzing trace with hash 1911369343, now seen corresponding path program 149 times [2021-05-02 13:02:38,181 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:38,181 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1317409500] [2021-05-02 13:02:38,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:38,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:38,703 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:38,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:38,706 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 13:02:38,706 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:38,706 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1317409500] [2021-05-02 13:02:38,706 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1317409500] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:38,706 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [480578825] [2021-05-02 13:02:38,706 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 156 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 156 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:56,018 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2021-05-02 13:02:56,019 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:56,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 99 conjunts are in the unsatisfiable core [2021-05-02 13:02:56,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:56,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:56,183 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:56,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:56,264 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 13:02:56,264 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [480578825] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:56,265 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:56,265 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 23 [2021-05-02 13:02:56,265 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1478515308] [2021-05-02 13:02:56,265 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 13:02:56,265 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:56,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 13:02:56,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=461, Unknown=0, NotChecked=0, Total=506 [2021-05-02 13:02:56,265 INFO L87 Difference]: Start difference. First operand 326 states and 376 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 20 states have internal predecessors, (44), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:58,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:58,418 INFO L93 Difference]: Finished difference Result 815 states and 987 transitions. [2021-05-02 13:02:58,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 13:02:58,419 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 20 states have internal predecessors, (44), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-02 13:02:58,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:58,421 INFO L225 Difference]: With dead ends: 815 [2021-05-02 13:02:58,421 INFO L226 Difference]: Without dead ends: 794 [2021-05-02 13:02:58,421 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 1385.1ms TimeCoverageRelationStatistics Valid=122, Invalid=1518, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 13:02:58,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 794 states. [2021-05-02 13:02:58,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 794 to 335. [2021-05-02 13:02:58,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 335 states, 330 states have (on average 1.1606060606060606) internal successors, (383), 330 states have internal predecessors, (383), 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 13:02:58,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 387 transitions. [2021-05-02 13:02:58,497 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 387 transitions. Word has length 59 [2021-05-02 13:02:58,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:58,498 INFO L480 AbstractCegarLoop]: Abstraction has 335 states and 387 transitions. [2021-05-02 13:02:58,498 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 20 states have internal predecessors, (44), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:58,498 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 387 transitions. [2021-05-02 13:02:58,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 13:02:58,498 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:58,498 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:58,704 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable171,156 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:58,704 INFO L428 AbstractCegarLoop]: === Iteration 159 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:58,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:58,705 INFO L82 PathProgramCache]: Analyzing trace with hash 1059289519, now seen corresponding path program 150 times [2021-05-02 13:02:58,705 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:58,705 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [856375927] [2021-05-02 13:02:58,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:58,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:59,707 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:59,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:59,710 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 0 proven. 227 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-05-02 13:02:59,710 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:59,710 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [856375927] [2021-05-02 13:02:59,710 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [856375927] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:59,710 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1087486727] [2021-05-02 13:02:59,711 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 157 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 157 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:03:02,156 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-05-02 13:03:02,156 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:03:02,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 63 conjunts are in the unsatisfiable core [2021-05-02 13:03:02,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:03:02,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:03:02,363 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 0 proven. 227 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-05-02 13:03:02,364 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1087486727] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:03:02,364 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:03:02,364 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2021-05-02 13:03:02,364 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692921730] [2021-05-02 13:03:02,364 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 13:03:02,364 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:03:02,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 13:03:02,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1109, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 13:03:02,364 INFO L87 Difference]: Start difference. First operand 335 states and 387 transitions. Second operand has 35 states, 35 states have (on average 1.2285714285714286) internal successors, (43), 34 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:03:06,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:03:06,535 INFO L93 Difference]: Finished difference Result 376 states and 428 transitions. [2021-05-02 13:03:06,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 13:03:06,536 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.2285714285714286) internal successors, (43), 34 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-02 13:03:06,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:03:06,537 INFO L225 Difference]: With dead ends: 376 [2021-05-02 13:03:06,537 INFO L226 Difference]: Without dead ends: 354 [2021-05-02 13:03:06,537 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 938 ImplicationChecksByTransitivity, 3319.8ms TimeCoverageRelationStatistics Valid=338, Invalid=5824, Unknown=0, NotChecked=0, Total=6162 [2021-05-02 13:03:06,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 354 states. [2021-05-02 13:03:06,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 354 to 336. [2021-05-02 13:03:06,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 336 states, 331 states have (on average 1.1601208459214503) internal successors, (384), 331 states have internal predecessors, (384), 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 13:03:06,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 388 transitions. [2021-05-02 13:03:06,614 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 388 transitions. Word has length 59 [2021-05-02 13:03:06,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:03:06,614 INFO L480 AbstractCegarLoop]: Abstraction has 336 states and 388 transitions. [2021-05-02 13:03:06,614 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.2285714285714286) internal successors, (43), 34 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:03:06,614 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 388 transitions. [2021-05-02 13:03:06,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 13:03:06,614 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:03:06,615 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:03:06,819 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable173,157 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:03:06,819 INFO L428 AbstractCegarLoop]: === Iteration 160 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:03:06,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:03:06,819 INFO L82 PathProgramCache]: Analyzing trace with hash 1338005567, now seen corresponding path program 151 times [2021-05-02 13:03:06,819 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:03:06,819 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [594347175] [2021-05-02 13:03:06,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:03:06,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:03:07,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:03:07,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:03:07,745 INFO L134 CoverageAnalysis]: Checked inductivity of 372 backedges. 0 proven. 219 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-05-02 13:03:07,745 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:03:07,746 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [594347175] [2021-05-02 13:03:07,746 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [594347175] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:03:07,746 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1126226175] [2021-05-02 13:03:07,746 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 158 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 158 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:03:07,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:03:07,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 61 conjunts are in the unsatisfiable core [2021-05-02 13:03:07,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:03:07,974 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:03:08,014 INFO L134 CoverageAnalysis]: Checked inductivity of 372 backedges. 0 proven. 219 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-05-02 13:03:08,015 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1126226175] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:03:08,015 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:03:08,015 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2021-05-02 13:03:08,015 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [826809120] [2021-05-02 13:03:08,015 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 13:03:08,015 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:03:08,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 13:03:08,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=1045, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 13:03:08,015 INFO L87 Difference]: Start difference. First operand 336 states and 388 transitions. Second operand has 34 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 33 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:03:12,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:03:12,683 INFO L93 Difference]: Finished difference Result 379 states and 431 transitions. [2021-05-02 13:03:12,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-02 13:03:12,684 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 33 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-02 13:03:12,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:03:12,684 INFO L225 Difference]: With dead ends: 379 [2021-05-02 13:03:12,684 INFO L226 Difference]: Without dead ends: 356 [2021-05-02 13:03:12,685 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1262 ImplicationChecksByTransitivity, 3557.5ms TimeCoverageRelationStatistics Valid=380, Invalid=6760, Unknown=0, NotChecked=0, Total=7140 [2021-05-02 13:03:12,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 356 states. [2021-05-02 13:03:12,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 356 to 337. [2021-05-02 13:03:12,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 332 states have (on average 1.1596385542168675) internal successors, (385), 332 states have internal predecessors, (385), 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 13:03:12,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 389 transitions. [2021-05-02 13:03:12,733 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 389 transitions. Word has length 59 [2021-05-02 13:03:12,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:03:12,734 INFO L480 AbstractCegarLoop]: Abstraction has 337 states and 389 transitions. [2021-05-02 13:03:12,734 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 33 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:03:12,734 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 389 transitions. [2021-05-02 13:03:12,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 13:03:12,734 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:03:12,734 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:03:12,934 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable174,158 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:03:12,935 INFO L428 AbstractCegarLoop]: === Iteration 161 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:03:12,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:03:12,935 INFO L82 PathProgramCache]: Analyzing trace with hash 1972244463, now seen corresponding path program 152 times [2021-05-02 13:03:12,935 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:03:12,935 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [110488516] [2021-05-02 13:03:12,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:03:12,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:03:13,821 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:03:13,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:03:13,823 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 0 proven. 216 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2021-05-02 13:03:13,823 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:03:13,823 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [110488516] [2021-05-02 13:03:13,824 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [110488516] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:03:13,824 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1052330635] [2021-05-02 13:03:13,824 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 159 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 159 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:03:13,883 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:03:13,883 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:03:13,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 59 conjunts are in the unsatisfiable core [2021-05-02 13:03:13,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:03:14,039 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:03:14,087 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 0 proven. 216 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2021-05-02 13:03:14,088 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1052330635] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:03:14,088 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:03:14,088 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2021-05-02 13:03:14,088 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [420156896] [2021-05-02 13:03:14,088 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 13:03:14,088 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:03:14,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 13:03:14,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=983, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 13:03:14,088 INFO L87 Difference]: Start difference. First operand 337 states and 389 transitions. Second operand has 33 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 32 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:03:18,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:03:18,830 INFO L93 Difference]: Finished difference Result 382 states and 434 transitions. [2021-05-02 13:03:18,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-02 13:03:18,831 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 32 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-02 13:03:18,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:03:18,831 INFO L225 Difference]: With dead ends: 382 [2021-05-02 13:03:18,831 INFO L226 Difference]: Without dead ends: 358 [2021-05-02 13:03:18,832 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1365 ImplicationChecksByTransitivity, 3582.6ms TimeCoverageRelationStatistics Valid=387, Invalid=6923, Unknown=0, NotChecked=0, Total=7310 [2021-05-02 13:03:18,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2021-05-02 13:03:18,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 338. [2021-05-02 13:03:18,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 338 states, 333 states have (on average 1.1591591591591592) internal successors, (386), 333 states have internal predecessors, (386), 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 13:03:18,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 390 transitions. [2021-05-02 13:03:18,881 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 390 transitions. Word has length 59 [2021-05-02 13:03:18,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:03:18,881 INFO L480 AbstractCegarLoop]: Abstraction has 338 states and 390 transitions. [2021-05-02 13:03:18,882 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 32 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:03:18,882 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 390 transitions. [2021-05-02 13:03:18,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 13:03:18,882 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:03:18,882 INFO L523 BasicCegarLoop]: trace histogram [31, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:03:19,082 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 159 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable175 [2021-05-02 13:03:19,083 INFO L428 AbstractCegarLoop]: === Iteration 162 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:03:19,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:03:19,083 INFO L82 PathProgramCache]: Analyzing trace with hash -729604818, now seen corresponding path program 153 times [2021-05-02 13:03:19,083 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:03:19,083 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724245613] [2021-05-02 13:03:19,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:03:19,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:03:20,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:03:20,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:03:20,635 INFO L134 CoverageAnalysis]: Checked inductivity of 553 backedges. 0 proven. 532 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-05-02 13:03:20,635 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:03:20,635 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724245613] [2021-05-02 13:03:20,635 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1724245613] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:03:20,635 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1010171326] [2021-05-02 13:03:20,636 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 160 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 160 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:03:20,878 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 13:03:20,878 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:03:20,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 13:03:20,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:03:22,450 INFO L134 CoverageAnalysis]: Checked inductivity of 553 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 497 trivial. 0 not checked. [2021-05-02 13:03:22,450 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1010171326] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:03:22,450 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:03:22,451 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 16] total 58 [2021-05-02 13:03:22,451 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578096435] [2021-05-02 13:03:22,451 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-02 13:03:22,451 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:03:22,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-02 13:03:22,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=338, Invalid=2968, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 13:03:22,451 INFO L87 Difference]: Start difference. First operand 338 states and 390 transitions. Second operand has 58 states, 58 states have (on average 1.2241379310344827) internal successors, (71), 57 states have internal predecessors, (71), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:03:48,416 WARN L205 SmtUtils]: Spent 4.54 s on a formula simplification that was a NOOP. DAG size: 84 [2021-05-02 13:03:54,096 WARN L205 SmtUtils]: Spent 1.16 s on a formula simplification that was a NOOP. DAG size: 78 [2021-05-02 13:04:09,878 WARN L205 SmtUtils]: Spent 7.12 s on a formula simplification that was a NOOP. DAG size: 86 [2021-05-02 13:04:11,885 WARN L205 SmtUtils]: Spent 822.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:04:23,145 WARN L205 SmtUtils]: Spent 4.30 s on a formula simplification that was a NOOP. DAG size: 87 [2021-05-02 13:04:27,414 WARN L205 SmtUtils]: Spent 1.53 s on a formula simplification that was a NOOP. DAG size: 80 [2021-05-02 13:04:28,256 WARN L205 SmtUtils]: Spent 307.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:04:43,117 WARN L205 SmtUtils]: Spent 7.74 s on a formula simplification that was a NOOP. DAG size: 87 [2021-05-02 13:04:47,217 WARN L205 SmtUtils]: Spent 1.64 s on a formula simplification that was a NOOP. DAG size: 81 [2021-05-02 13:04:48,757 WARN L205 SmtUtils]: Spent 536.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:04:49,257 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-02 13:04:49,797 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 40 [2021-05-02 13:05:04,360 WARN L205 SmtUtils]: Spent 5.66 s on a formula simplification that was a NOOP. DAG size: 87 [2021-05-02 13:05:08,503 WARN L205 SmtUtils]: Spent 1.82 s on a formula simplification that was a NOOP. DAG size: 81 [2021-05-02 13:05:10,912 WARN L205 SmtUtils]: Spent 655.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2021-05-02 13:05:12,444 WARN L205 SmtUtils]: Spent 392.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:05:31,627 WARN L205 SmtUtils]: Spent 6.97 s on a formula simplification that was a NOOP. DAG size: 87 [2021-05-02 13:05:36,320 WARN L205 SmtUtils]: Spent 1.97 s on a formula simplification that was a NOOP. DAG size: 81 [2021-05-02 13:05:39,013 WARN L205 SmtUtils]: Spent 772.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2021-05-02 13:05:40,068 WARN L205 SmtUtils]: Spent 355.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:05:40,628 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 13:05:41,549 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 39 [2021-05-02 13:05:53,836 WARN L205 SmtUtils]: Spent 5.38 s on a formula simplification that was a NOOP. DAG size: 87 [2021-05-02 13:05:59,969 WARN L205 SmtUtils]: Spent 2.26 s on a formula simplification that was a NOOP. DAG size: 81 [2021-05-02 13:06:02,398 WARN L205 SmtUtils]: Spent 1.16 s on a formula simplification that was a NOOP. DAG size: 73 [2021-05-02 13:06:03,401 WARN L205 SmtUtils]: Spent 360.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:06:03,998 WARN L205 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2021-05-02 13:06:27,158 WARN L205 SmtUtils]: Spent 8.27 s on a formula simplification that was a NOOP. DAG size: 87 [2021-05-02 13:06:31,734 WARN L205 SmtUtils]: Spent 1.48 s on a formula simplification that was a NOOP. DAG size: 81 [2021-05-02 13:06:34,175 WARN L205 SmtUtils]: Spent 1.05 s on a formula simplification that was a NOOP. DAG size: 73 [2021-05-02 13:06:35,526 WARN L205 SmtUtils]: Spent 486.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:06:36,162 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 57