/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/nla-digbench/divbin2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 13:37:48,512 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 13:37:48,513 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 13:37:48,547 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 13:37:48,547 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 13:37:48,551 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 13:37:48,554 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 13:37:48,560 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 13:37:48,561 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 13:37:48,565 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 13:37:48,565 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 13:37:48,566 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 13:37:48,566 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 13:37:48,566 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 13:37:48,567 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 13:37:48,568 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 13:37:48,568 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 13:37:48,568 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 13:37:48,569 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 13:37:48,570 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 13:37:48,571 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 13:37:48,574 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 13:37:48,575 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 13:37:48,575 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 13:37:48,577 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-02 13:37:48,577 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-02 13:37:48,577 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-02 13:37:48,578 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-02 13:37:48,578 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-02 13:37:48,578 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-02 13:37:48,579 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-02 13:37:48,579 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-02 13:37:48,591 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-02 13:37:48,592 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-02 13:37:48,592 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-02 13:37:48,592 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-02 13:37:48,593 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-02 13:37:48,593 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-02 13:37:48,593 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 13:37:48,594 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 13:37:48,594 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 13:37:48,597 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 13:37:48,624 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 13:37:48,624 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 13:37:48,627 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 13:37:48,627 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 13:37:48,627 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 13:37:48,627 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 13:37:48,627 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 13:37:48,628 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 13:37:48,628 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 13:37:48,628 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 13:37:48,629 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 13:37:48,629 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 13:37:48,629 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 13:37:48,629 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 13:37:48,629 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 13:37:48,629 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 13:37:48,629 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 13:37:48,629 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 13:37:48,629 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 13:37:48,630 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 13:37:48,630 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:37:48,630 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 13:37:48,630 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 13:37:48,630 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 13:37:48,630 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 13:37:48,630 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 13:37:48,630 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 13:37:48,631 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 13:37:48,631 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 13:37:48,883 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 13:37:48,899 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 13:37:48,901 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 13:37:48,902 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 13:37:48,902 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 13:37:48,903 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/divbin2.i [2021-05-02 13:37:48,961 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e726f88ea/37a55059e8324dd1aaff32014da4947a/FLAG26af9f81b [2021-05-02 13:37:49,292 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 13:37:49,292 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/divbin2.i [2021-05-02 13:37:49,304 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e726f88ea/37a55059e8324dd1aaff32014da4947a/FLAG26af9f81b [2021-05-02 13:37:49,313 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e726f88ea/37a55059e8324dd1aaff32014da4947a [2021-05-02 13:37:49,315 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 13:37:49,316 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 13:37:49,317 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 13:37:49,317 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 13:37:49,320 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 13:37:49,320 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:37:49" (1/1) ... [2021-05-02 13:37:49,321 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@b9f63d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:37:49, skipping insertion in model container [2021-05-02 13:37:49,321 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:37:49" (1/1) ... [2021-05-02 13:37:49,325 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 13:37:49,334 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 13:37:49,419 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/divbin2.i[959,972] [2021-05-02 13:37:49,426 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:37:49,431 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 13:37:49,439 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/divbin2.i[959,972] [2021-05-02 13:37:49,442 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:37:49,450 INFO L208 MainTranslator]: Completed translation [2021-05-02 13:37:49,451 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:37:49 WrapperNode [2021-05-02 13:37:49,451 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 13:37:49,452 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 13:37:49,452 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 13:37:49,452 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 13:37:49,458 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:37:49" (1/1) ... [2021-05-02 13:37:49,458 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:37:49" (1/1) ... [2021-05-02 13:37:49,482 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:37:49" (1/1) ... [2021-05-02 13:37:49,483 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:37:49" (1/1) ... [2021-05-02 13:37:49,520 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:37:49" (1/1) ... [2021-05-02 13:37:49,524 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:37:49" (1/1) ... [2021-05-02 13:37:49,530 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:37:49" (1/1) ... [2021-05-02 13:37:49,533 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 13:37:49,534 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 13:37:49,534 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 13:37:49,534 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 13:37:49,535 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:37:49" (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 13:37:49,596 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 13:37:49,596 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 13:37:49,596 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 13:37:49,597 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 13:37:49,597 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 13:37:49,597 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 13:37:49,597 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 13:37:49,597 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 13:37:49,598 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 13:37:49,598 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 13:37:49,598 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 13:37:49,598 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 13:37:49,599 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-02 13:37:49,599 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 13:37:49,600 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 13:37:49,600 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 13:37:49,600 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 13:37:49,600 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 13:37:49,600 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 13:37:49,600 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 13:37:49,601 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 13:37:49,601 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 13:37:49,826 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 13:37:49,826 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 13:37:49,827 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:37:49 BoogieIcfgContainer [2021-05-02 13:37:49,827 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 13:37:49,828 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 13:37:49,828 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 13:37:49,830 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 13:37:49,830 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 01:37:49" (1/3) ... [2021-05-02 13:37:49,831 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37d4786d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:37:49, skipping insertion in model container [2021-05-02 13:37:49,831 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:37:49" (2/3) ... [2021-05-02 13:37:49,831 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37d4786d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:37:49, skipping insertion in model container [2021-05-02 13:37:49,831 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:37:49" (3/3) ... [2021-05-02 13:37:49,832 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin2.i [2021-05-02 13:37:49,835 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 13:37:49,837 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 13:37:49,849 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 13:37:49,863 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 13:37:49,863 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 13:37:49,863 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 13:37:49,863 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 13:37:49,863 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 13:37:49,863 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 13:37:49,863 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 13:37:49,864 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 13:37:49,874 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 15 states have (on average 1.6) internal successors, (24), 16 states have internal predecessors, (24), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 13:37:49,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 13:37:49,877 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:37:49,878 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:37:49,878 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:37:49,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:37:49,887 INFO L82 PathProgramCache]: Analyzing trace with hash 1443343444, now seen corresponding path program 1 times [2021-05-02 13:37:49,892 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:37:49,893 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1684980820] [2021-05-02 13:37:49,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:37:49,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:37:50,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:37:50,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:37:50,087 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 13:37:50,088 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:37:50,088 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1684980820] [2021-05-02 13:37:50,088 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1684980820] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:37:50,089 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:37:50,089 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 13:37:50,089 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [762119776] [2021-05-02 13:37:50,092 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 13:37:50,092 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:37:50,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 13:37:50,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:37:50,101 INFO L87 Difference]: Start difference. First operand has 24 states, 15 states have (on average 1.6) internal successors, (24), 16 states have internal predecessors, (24), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 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 13:37:50,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:37:50,156 INFO L93 Difference]: Finished difference Result 40 states and 55 transitions. [2021-05-02 13:37:50,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 13:37:50,157 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 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 12 [2021-05-02 13:37:50,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:37:50,162 INFO L225 Difference]: With dead ends: 40 [2021-05-02 13:37:50,162 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 13:37:50,164 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 56.2ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:37:50,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 13:37:50,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-02 13:37:50,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 states have internal predecessors, (16), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 13:37:50,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2021-05-02 13:37:50,186 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 12 [2021-05-02 13:37:50,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:37:50,186 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2021-05-02 13:37:50,187 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 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 13:37:50,187 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2021-05-02 13:37:50,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 13:37:50,187 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:37:50,187 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:37:50,187 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 13:37:50,188 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:37:50,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:37:50,188 INFO L82 PathProgramCache]: Analyzing trace with hash -1532818659, now seen corresponding path program 1 times [2021-05-02 13:37:50,188 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:37:50,189 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1083298816] [2021-05-02 13:37:50,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:37:50,207 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:37:50,208 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1700783858] [2021-05-02 13:37:50,208 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 13:37:50,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:37:50,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 13:37:50,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:37:50,347 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:50,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:50,377 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 13:37:50,377 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:37:50,377 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1083298816] [2021-05-02 13:37:50,377 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:37:50,377 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1700783858] [2021-05-02 13:37:50,378 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1700783858] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:37:50,378 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:37:50,378 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 13:37:50,378 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458792273] [2021-05-02 13:37:50,379 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:37:50,379 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:37:50,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:37:50,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:37:50,387 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 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 13:37:50,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:37:50,442 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2021-05-02 13:37:50,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:37:50,443 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 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 13 [2021-05-02 13:37:50,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:37:50,443 INFO L225 Difference]: With dead ends: 31 [2021-05-02 13:37:50,443 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 13:37:50,444 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 35.9ms TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:37:50,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 13:37:50,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-05-02 13:37:50,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 19 states have (on average 1.263157894736842) internal successors, (24), 20 states have internal predecessors, (24), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:37:50,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2021-05-02 13:37:50,450 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 13 [2021-05-02 13:37:50,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:37:50,450 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2021-05-02 13:37:50,450 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 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 13:37:50,450 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2021-05-02 13:37:50,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 13:37:50,451 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:37:50,451 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:37:50,658 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 13:37:50,659 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:37:50,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:37:50,659 INFO L82 PathProgramCache]: Analyzing trace with hash 909386808, now seen corresponding path program 1 times [2021-05-02 13:37:50,660 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:37:50,660 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [849746363] [2021-05-02 13:37:50,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:37:50,671 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:37:50,672 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [4520336] [2021-05-02 13:37:50,672 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 13:37:50,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:37:50,754 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 13:37:50,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:37:50,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:50,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:50,885 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:37:50,886 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:37:50,886 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [849746363] [2021-05-02 13:37:50,886 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:37:50,886 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [4520336] [2021-05-02 13:37:50,886 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [4520336] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:37:50,886 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:37:50,887 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 13:37:50,887 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1881386585] [2021-05-02 13:37:50,887 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:37:50,887 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:37:50,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:37:50,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:37:50,888 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 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 13:37:51,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:37:51,010 INFO L93 Difference]: Finished difference Result 39 states and 45 transitions. [2021-05-02 13:37:51,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:37:51,011 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 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 15 [2021-05-02 13:37:51,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:37:51,011 INFO L225 Difference]: With dead ends: 39 [2021-05-02 13:37:51,011 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 13:37:51,012 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 44.1ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:37:51,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 13:37:51,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-02 13:37:51,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 25 states have (on average 1.24) internal successors, (31), 26 states have internal predecessors, (31), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 13:37:51,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2021-05-02 13:37:51,018 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 15 [2021-05-02 13:37:51,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:37:51,018 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2021-05-02 13:37:51,018 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 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 13:37:51,018 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2021-05-02 13:37:51,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 13:37:51,019 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:37:51,019 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:37:51,232 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:37:51,235 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:37:51,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:37:51,235 INFO L82 PathProgramCache]: Analyzing trace with hash 1729767853, now seen corresponding path program 1 times [2021-05-02 13:37:51,238 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:37:51,238 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1124887545] [2021-05-02 13:37:51,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:37:51,245 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:37:51,246 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [179828525] [2021-05-02 13:37:51,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 13:37:51,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:37:51,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 13:37:51,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:37:51,381 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:37:51,382 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:37:51,382 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1124887545] [2021-05-02 13:37:51,382 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:37:51,382 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [179828525] [2021-05-02 13:37:51,382 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [179828525] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:37:51,382 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:37:51,382 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 13:37:51,382 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436276680] [2021-05-02 13:37:51,383 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 13:37:51,383 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:37:51,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 13:37:51,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:37:51,383 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 13:37:51,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:37:51,402 INFO L93 Difference]: Finished difference Result 47 states and 54 transitions. [2021-05-02 13:37:51,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 13:37:51,402 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2021-05-02 13:37:51,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:37:51,403 INFO L225 Difference]: With dead ends: 47 [2021-05-02 13:37:51,403 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 13:37:51,403 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:37:51,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 13:37:51,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-05-02 13:37:51,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 20 states have (on average 1.25) internal successors, (25), 21 states have internal predecessors, (25), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:37:51,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2021-05-02 13:37:51,408 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 21 [2021-05-02 13:37:51,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:37:51,408 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2021-05-02 13:37:51,408 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 13:37:51,408 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2021-05-02 13:37:51,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 13:37:51,409 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:37:51,409 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:37:51,620 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:37:51,621 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:37:51,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:37:51,621 INFO L82 PathProgramCache]: Analyzing trace with hash 700053448, now seen corresponding path program 1 times [2021-05-02 13:37:51,622 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:37:51,622 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1181149817] [2021-05-02 13:37:51,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:37:51,631 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:37:51,632 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [376357820] [2021-05-02 13:37:51,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:37:51,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:37:51,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 13:37:51,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:37:51,801 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:51,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:51,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:51,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:51,918 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:37:51,918 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:37:51,919 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1181149817] [2021-05-02 13:37:51,919 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:37:51,919 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [376357820] [2021-05-02 13:37:51,919 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [376357820] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:37:51,919 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:37:51,919 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 13:37:51,919 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992993442] [2021-05-02 13:37:51,919 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 13:37:51,920 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:37:51,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 13:37:51,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:37:51,920 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 states have internal predecessors, (17), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 13:37:52,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:37:52,047 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2021-05-02 13:37:52,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 13:37:52,047 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 states have internal predecessors, (17), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 23 [2021-05-02 13:37:52,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:37:52,048 INFO L225 Difference]: With dead ends: 52 [2021-05-02 13:37:52,048 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 13:37:52,049 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 109.8ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-02 13:37:52,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 13:37:52,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2021-05-02 13:37:52,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 34 states have (on average 1.2058823529411764) internal successors, (41), 36 states have internal predecessors, (41), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 13:37:52,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 55 transitions. [2021-05-02 13:37:52,057 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 55 transitions. Word has length 23 [2021-05-02 13:37:52,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:37:52,057 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 55 transitions. [2021-05-02 13:37:52,058 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 states have internal predecessors, (17), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 13:37:52,058 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 55 transitions. [2021-05-02 13:37:52,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 13:37:52,059 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:37:52,059 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:37:52,280 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:37:52,281 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:37:52,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:37:52,281 INFO L82 PathProgramCache]: Analyzing trace with hash -1013011677, now seen corresponding path program 2 times [2021-05-02 13:37:52,282 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:37:52,282 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [293910189] [2021-05-02 13:37:52,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:37:52,291 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:37:52,291 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1827482947] [2021-05-02 13:37:52,291 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:37:52,346 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:37:52,347 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:37:52,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 13:37:52,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:37:52,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:52,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:52,546 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:52,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:52,589 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:37:52,590 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:37:52,590 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [293910189] [2021-05-02 13:37:52,590 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:37:52,590 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1827482947] [2021-05-02 13:37:52,591 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1827482947] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:37:52,591 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:37:52,591 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 13:37:52,591 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1829252848] [2021-05-02 13:37:52,591 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 13:37:52,592 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:37:52,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 13:37:52,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:37:52,593 INFO L87 Difference]: Start difference. First operand 48 states and 55 transitions. Second operand has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 11 states have internal predecessors, (19), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 13:37:52,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:37:52,816 INFO L93 Difference]: Finished difference Result 93 states and 108 transitions. [2021-05-02 13:37:52,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 13:37:52,816 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 11 states have internal predecessors, (19), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2021-05-02 13:37:52,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:37:52,820 INFO L225 Difference]: With dead ends: 93 [2021-05-02 13:37:52,820 INFO L226 Difference]: Without dead ends: 67 [2021-05-02 13:37:52,822 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 168.2ms TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:37:52,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-05-02 13:37:52,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 58. [2021-05-02 13:37:52,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 42 states have (on average 1.1904761904761905) internal successors, (50), 44 states have internal predecessors, (50), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 13:37:52,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 66 transitions. [2021-05-02 13:37:52,842 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 66 transitions. Word has length 25 [2021-05-02 13:37:52,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:37:52,843 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 66 transitions. [2021-05-02 13:37:52,843 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 11 states have internal predecessors, (19), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 13:37:52,843 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 66 transitions. [2021-05-02 13:37:52,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 13:37:52,843 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:37:52,843 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:37:53,056 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 13:37:53,057 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:37:53,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:37:53,058 INFO L82 PathProgramCache]: Analyzing trace with hash 1998844862, now seen corresponding path program 3 times [2021-05-02 13:37:53,058 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:37:53,058 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [490756900] [2021-05-02 13:37:53,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:37:53,066 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:37:53,066 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [502365299] [2021-05-02 13:37:53,067 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:37:53,171 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 13:37:53,171 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:37:53,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 13:37:53,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:37:53,212 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:53,216 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:53,253 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:53,256 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:53,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:53,359 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:53,395 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 13:37:53,395 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:37:53,395 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [490756900] [2021-05-02 13:37:53,396 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:37:53,396 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [502365299] [2021-05-02 13:37:53,396 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [502365299] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:37:53,396 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:37:53,396 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 13:37:53,396 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756780620] [2021-05-02 13:37:53,397 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:37:53,397 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:37:53,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:37:53,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:37:53,398 INFO L87 Difference]: Start difference. First operand 58 states and 66 transitions. Second operand has 10 states, 10 states have (on average 1.6) internal successors, (16), 9 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 13:37:53,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:37:53,555 INFO L93 Difference]: Finished difference Result 72 states and 82 transitions. [2021-05-02 13:37:53,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 13:37:53,559 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.6) internal successors, (16), 9 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 27 [2021-05-02 13:37:53,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:37:53,560 INFO L225 Difference]: With dead ends: 72 [2021-05-02 13:37:53,560 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 13:37:53,560 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 98.7ms TimeCoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2021-05-02 13:37:53,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 13:37:53,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 58. [2021-05-02 13:37:53,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 42 states have (on average 1.1904761904761905) internal successors, (50), 44 states have internal predecessors, (50), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 13:37:53,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 66 transitions. [2021-05-02 13:37:53,566 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 66 transitions. Word has length 27 [2021-05-02 13:37:53,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:37:53,566 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 66 transitions. [2021-05-02 13:37:53,566 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 1.6) internal successors, (16), 9 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 13:37:53,566 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 66 transitions. [2021-05-02 13:37:53,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 13:37:53,567 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:37:53,567 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:37:53,768 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:37:53,768 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:37:53,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:37:53,769 INFO L82 PathProgramCache]: Analyzing trace with hash -1774503080, now seen corresponding path program 4 times [2021-05-02 13:37:53,769 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:37:53,770 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [441149053] [2021-05-02 13:37:53,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:37:53,790 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:37:53,790 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1309436382] [2021-05-02 13:37:53,790 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:37:53,842 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:37:53,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:37:53,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 13:37:53,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:37:53,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:53,903 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:53,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:53,938 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:53,972 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 9 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:37:53,972 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:37:53,972 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [441149053] [2021-05-02 13:37:53,972 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:37:53,972 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1309436382] [2021-05-02 13:37:53,972 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1309436382] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:37:53,972 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:37:53,972 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 13:37:53,973 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596533515] [2021-05-02 13:37:53,973 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:37:53,973 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:37:53,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:37:53,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:37:53,974 INFO L87 Difference]: Start difference. First operand 58 states and 66 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:37:54,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:37:54,006 INFO L93 Difference]: Finished difference Result 74 states and 85 transitions. [2021-05-02 13:37:54,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:37:54,006 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 31 [2021-05-02 13:37:54,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:37:54,007 INFO L225 Difference]: With dead ends: 74 [2021-05-02 13:37:54,007 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 13:37:54,007 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 40.0ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:37:54,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 13:37:54,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-05-02 13:37:54,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 39 states have internal predecessors, (45), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 13:37:54,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 59 transitions. [2021-05-02 13:37:54,017 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 59 transitions. Word has length 31 [2021-05-02 13:37:54,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:37:54,018 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 59 transitions. [2021-05-02 13:37:54,018 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:37:54,018 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 59 transitions. [2021-05-02 13:37:54,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 13:37:54,020 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:37:54,020 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:37:54,232 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:37:54,233 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:37:54,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:37:54,233 INFO L82 PathProgramCache]: Analyzing trace with hash -1710201933, now seen corresponding path program 5 times [2021-05-02 13:37:54,233 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:37:54,234 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1540304333] [2021-05-02 13:37:54,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:37:54,244 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:37:54,244 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [895347985] [2021-05-02 13:37:54,244 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 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 13:37:55,369 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-02 13:37:55,369 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:37:55,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-02 13:37:55,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:37:55,425 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:55,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:55,490 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:55,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:55,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:55,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:55,582 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:37:55,582 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:37:55,582 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1540304333] [2021-05-02 13:37:55,582 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:37:55,582 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [895347985] [2021-05-02 13:37:55,582 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [895347985] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:37:55,583 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:37:55,583 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-02 13:37:55,583 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [942433799] [2021-05-02 13:37:55,583 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 13:37:55,583 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:37:55,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 13:37:55,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:37:55,584 INFO L87 Difference]: Start difference. First operand 52 states and 59 transitions. Second operand has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 13 states have internal predecessors, (22), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:37:55,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:37:55,772 INFO L93 Difference]: Finished difference Result 94 states and 107 transitions. [2021-05-02 13:37:55,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 13:37:55,773 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), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 33 [2021-05-02 13:37:55,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:37:55,774 INFO L225 Difference]: With dead ends: 94 [2021-05-02 13:37:55,774 INFO L226 Difference]: Without dead ends: 66 [2021-05-02 13:37:55,774 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 156.2ms TimeCoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:37:55,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-02 13:37:55,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 56. [2021-05-02 13:37:55,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 41 states have (on average 1.170731707317073) internal successors, (48), 42 states have internal predecessors, (48), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 13:37:55,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 62 transitions. [2021-05-02 13:37:55,779 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 62 transitions. Word has length 33 [2021-05-02 13:37:55,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:37:55,780 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 62 transitions. [2021-05-02 13:37:55,780 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), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:37:55,780 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 62 transitions. [2021-05-02 13:37:55,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 13:37:55,780 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:37:55,780 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:37:55,981 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-05-02 13:37:55,981 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:37:55,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:37:55,982 INFO L82 PathProgramCache]: Analyzing trace with hash -46341810, now seen corresponding path program 6 times [2021-05-02 13:37:55,982 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:37:55,982 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1043413545] [2021-05-02 13:37:55,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:37:55,989 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:37:55,989 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1707177082] [2021-05-02 13:37:55,989 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true