/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-scaling/fermat1-ll_unwindbound20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 15:02:11,820 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 15:02:11,822 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 15:02:11,844 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 15:02:11,844 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 15:02:11,845 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 15:02:11,846 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 15:02:11,847 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 15:02:11,849 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 15:02:11,849 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 15:02:11,850 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 15:02:11,851 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 15:02:11,867 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 15:02:11,869 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 15:02:11,870 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 15:02:11,873 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 15:02:11,873 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 15:02:11,874 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 15:02:11,875 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 15:02:11,876 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 15:02:11,877 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 15:02:11,880 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 15:02:11,881 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 15:02:11,881 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 15:02:11,883 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-02 15:02:11,883 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-02 15:02:11,883 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-02 15:02:11,884 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-02 15:02:11,884 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-02 15:02:11,885 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-02 15:02:11,885 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-02 15:02:11,886 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-02 15:02:11,886 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-02 15:02:11,887 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-02 15:02:11,887 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-02 15:02:11,887 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-02 15:02:11,888 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-02 15:02:11,888 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-02 15:02:11,888 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 15:02:11,889 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 15:02:11,889 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 15:02:11,905 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 15:02:11,934 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 15:02:11,934 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 15:02:11,936 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 15:02:11,936 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 15:02:11,937 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 15:02:11,937 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 15:02:11,937 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 15:02:11,937 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 15:02:11,937 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 15:02:11,937 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 15:02:11,938 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 15:02:11,938 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 15:02:11,938 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 15:02:11,938 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 15:02:11,938 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 15:02:11,938 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 15:02:11,938 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 15:02:11,938 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 15:02:11,939 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 15:02:11,939 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 15:02:11,939 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 15:02:11,939 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 15:02:11,939 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 15:02:11,939 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 15:02:11,939 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 15:02:11,939 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 15:02:11,939 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 15:02:11,939 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 15:02:11,940 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 15:02:12,174 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 15:02:12,191 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 15:02:12,192 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 15:02:12,193 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 15:02:12,194 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 15:02:12,194 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/fermat1-ll_unwindbound20.c [2021-05-02 15:02:12,243 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/34368c70f/5e627fea6f9c4864aceca7e76b99f68a/FLAGf90b2f548 [2021-05-02 15:02:12,560 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 15:02:12,561 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/fermat1-ll_unwindbound20.c [2021-05-02 15:02:12,566 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/34368c70f/5e627fea6f9c4864aceca7e76b99f68a/FLAGf90b2f548 [2021-05-02 15:02:12,976 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/34368c70f/5e627fea6f9c4864aceca7e76b99f68a [2021-05-02 15:02:12,978 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 15:02:12,980 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 15:02:12,982 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 15:02:12,982 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 15:02:12,985 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 15:02:12,985 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 03:02:12" (1/1) ... [2021-05-02 15:02:12,986 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7ef39e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:02:12, skipping insertion in model container [2021-05-02 15:02:12,987 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 03:02:12" (1/1) ... [2021-05-02 15:02:12,991 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 15:02:13,002 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 15:02:13,085 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-scaling/fermat1-ll_unwindbound20.c[535,548] [2021-05-02 15:02:13,113 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 15:02:13,118 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 15:02:13,136 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-scaling/fermat1-ll_unwindbound20.c[535,548] [2021-05-02 15:02:13,162 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 15:02:13,170 INFO L208 MainTranslator]: Completed translation [2021-05-02 15:02:13,171 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:02:13 WrapperNode [2021-05-02 15:02:13,171 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 15:02:13,172 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 15:02:13,172 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 15:02:13,172 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 15:02:13,178 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:02:13" (1/1) ... [2021-05-02 15:02:13,179 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:02:13" (1/1) ... [2021-05-02 15:02:13,183 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:02:13" (1/1) ... [2021-05-02 15:02:13,183 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:02:13" (1/1) ... [2021-05-02 15:02:13,186 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:02:13" (1/1) ... [2021-05-02 15:02:13,189 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:02:13" (1/1) ... [2021-05-02 15:02:13,190 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:02:13" (1/1) ... [2021-05-02 15:02:13,191 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 15:02:13,192 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 15:02:13,192 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 15:02:13,192 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 15:02:13,194 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:02:13" (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 15:02:13,267 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 15:02:13,267 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 15:02:13,267 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 15:02:13,267 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 15:02:13,267 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 15:02:13,267 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 15:02:13,268 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 15:02:13,268 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 15:02:13,268 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 15:02:13,268 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 15:02:13,268 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 15:02:13,268 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 15:02:13,268 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 15:02:13,268 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 15:02:13,268 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 15:02:13,268 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 15:02:13,268 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 15:02:13,268 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 15:02:13,268 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 15:02:13,269 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 15:02:13,479 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 15:02:13,479 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-05-02 15:02:13,480 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 03:02:13 BoogieIcfgContainer [2021-05-02 15:02:13,480 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 15:02:13,481 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 15:02:13,481 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 15:02:13,483 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 15:02:13,483 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 03:02:12" (1/3) ... [2021-05-02 15:02:13,483 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ac32353 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 03:02:13, skipping insertion in model container [2021-05-02 15:02:13,483 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:02:13" (2/3) ... [2021-05-02 15:02:13,484 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ac32353 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 03:02:13, skipping insertion in model container [2021-05-02 15:02:13,484 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 03:02:13" (3/3) ... [2021-05-02 15:02:13,485 INFO L111 eAbstractionObserver]: Analyzing ICFG fermat1-ll_unwindbound20.c [2021-05-02 15:02:13,499 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 15:02:13,502 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 15:02:13,512 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 15:02:13,525 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 15:02:13,526 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 15:02:13,526 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 15:02:13,526 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 15:02:13,526 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 15:02:13,526 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 15:02:13,526 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 15:02:13,526 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 15:02:13,543 INFO L276 IsEmpty]: Start isEmpty. Operand has 37 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 24 states have internal predecessors, (35), 8 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 15:02:13,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 15:02:13,546 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:02:13,547 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:02:13,547 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:02:13,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:02:13,554 INFO L82 PathProgramCache]: Analyzing trace with hash 928708300, now seen corresponding path program 1 times [2021-05-02 15:02:13,560 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:02:13,560 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [447506486] [2021-05-02 15:02:13,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:02:13,652 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:02:13,653 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1499884743] [2021-05-02 15:02:13,654 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 15:02:13,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:02:13,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 1 conjunts are in the unsatisfiable core [2021-05-02 15:02:13,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:02:13,825 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 15:02:13,825 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:02:13,825 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [447506486] [2021-05-02 15:02:13,825 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:02:13,826 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1499884743] [2021-05-02 15:02:13,826 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1499884743] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:02:13,826 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:02:13,826 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-05-02 15:02:13,827 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372829024] [2021-05-02 15:02:13,830 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2021-05-02 15:02:13,830 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:02:13,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-05-02 15:02:13,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-05-02 15:02:13,843 INFO L87 Difference]: Start difference. First operand has 37 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 24 states have internal predecessors, (35), 8 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Second operand has 2 states, 2 states have (on average 6.5) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:02:13,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:02:13,864 INFO L93 Difference]: Finished difference Result 67 states and 100 transitions. [2021-05-02 15:02:13,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-05-02 15:02:13,866 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 6.5) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 22 [2021-05-02 15:02:13,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:02:13,870 INFO L225 Difference]: With dead ends: 67 [2021-05-02 15:02:13,871 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 15:02:13,873 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0ms TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-05-02 15:02:13,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 15:02:13,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 15:02:13,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 20 states have (on average 1.35) internal successors, (27), 21 states have internal predecessors, (27), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 15:02:13,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 41 transitions. [2021-05-02 15:02:13,902 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 41 transitions. Word has length 22 [2021-05-02 15:02:13,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:02:13,902 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 41 transitions. [2021-05-02 15:02:13,902 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 2 states, 2 states have (on average 6.5) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:02:13,902 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 41 transitions. [2021-05-02 15:02:13,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 15:02:13,904 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:02:13,904 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:02:14,121 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-05-02 15:02:14,122 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:02:14,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:02:14,122 INFO L82 PathProgramCache]: Analyzing trace with hash -155606603, now seen corresponding path program 1 times [2021-05-02 15:02:14,122 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:02:14,123 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [513488808] [2021-05-02 15:02:14,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:02:14,138 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:02:14,139 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [122507676] [2021-05-02 15:02:14,139 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 15:02:14,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:02:14,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 15:02:14,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:02:14,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:14,234 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:14,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:14,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:14,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:14,319 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:02:14,319 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:02:14,319 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [513488808] [2021-05-02 15:02:14,319 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:02:14,319 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [122507676] [2021-05-02 15:02:14,319 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [122507676] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:02:14,319 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:02:14,320 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 15:02:14,320 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161344508] [2021-05-02 15:02:14,321 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 15:02:14,321 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:02:14,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 15:02:14,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 15:02:14,323 INFO L87 Difference]: Start difference. First operand 32 states and 41 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:02:14,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:02:14,344 INFO L93 Difference]: Finished difference Result 41 states and 50 transitions. [2021-05-02 15:02:14,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 15:02:14,345 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-05-02 15:02:14,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:02:14,348 INFO L225 Difference]: With dead ends: 41 [2021-05-02 15:02:14,348 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 15:02:14,349 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.8ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 15:02:14,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 15:02:14,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 15:02:14,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 22 states have (on average 1.3181818181818181) internal successors, (29), 23 states have internal predecessors, (29), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 15:02:14,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 43 transitions. [2021-05-02 15:02:14,358 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 43 transitions. Word has length 23 [2021-05-02 15:02:14,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:02:14,359 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 43 transitions. [2021-05-02 15:02:14,359 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:02:14,363 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 43 transitions. [2021-05-02 15:02:14,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 15:02:14,364 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:02:14,364 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:02:14,577 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:02:14,577 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:02:14,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:02:14,578 INFO L82 PathProgramCache]: Analyzing trace with hash -153938307, now seen corresponding path program 1 times [2021-05-02 15:02:14,578 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:02:14,578 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1925573444] [2021-05-02 15:02:14,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:02:14,600 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:02:14,600 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1107872530] [2021-05-02 15:02:14,600 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 15:02:14,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:02:14,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 15:02:14,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:02:14,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:14,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:14,822 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:14,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:14,894 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 15:02:14,894 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:02:14,894 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1925573444] [2021-05-02 15:02:14,894 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:02:14,894 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1107872530] [2021-05-02 15:02:14,894 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1107872530] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:02:14,894 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:02:14,894 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 15:02:14,894 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112273084] [2021-05-02 15:02:14,895 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 15:02:14,895 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:02:14,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 15:02:14,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:02:14,895 INFO L87 Difference]: Start difference. First operand 34 states and 43 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:02:21,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:02:21,094 INFO L93 Difference]: Finished difference Result 53 states and 70 transitions. [2021-05-02 15:02:21,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:02:21,094 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-05-02 15:02:21,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:02:21,096 INFO L225 Difference]: With dead ends: 53 [2021-05-02 15:02:21,096 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 15:02:21,096 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 102.8ms TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-02 15:02:21,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 15:02:21,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2021-05-02 15:02:21,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 34 states have (on average 1.3823529411764706) internal successors, (47), 35 states have internal predecessors, (47), 11 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 15:02:21,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 67 transitions. [2021-05-02 15:02:21,104 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 67 transitions. Word has length 23 [2021-05-02 15:02:21,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:02:21,104 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 67 transitions. [2021-05-02 15:02:21,104 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:02:21,104 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 67 transitions. [2021-05-02 15:02:21,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 15:02:21,105 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:02:21,105 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:02:21,320 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:02:21,321 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:02:21,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:02:21,321 INFO L82 PathProgramCache]: Analyzing trace with hash -1676885497, now seen corresponding path program 1 times [2021-05-02 15:02:21,321 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:02:21,321 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1645862504] [2021-05-02 15:02:21,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:02:21,329 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:02:21,329 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1708494883] [2021-05-02 15:02:21,329 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 15:02:21,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:02:21,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 15:02:21,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:02:21,396 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,397 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,405 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,418 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,425 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,439 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,444 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,446 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,468 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,469 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,471 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,476 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,498 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,526 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,529 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,533 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,534 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:21,561 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 15:02:21,561 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:02:21,561 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1645862504] [2021-05-02 15:02:21,561 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:02:21,561 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1708494883] [2021-05-02 15:02:21,561 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1708494883] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:02:21,562 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:02:21,562 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 15:02:21,562 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286737992] [2021-05-02 15:02:21,562 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 15:02:21,562 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:02:21,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 15:02:21,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 15:02:21,563 INFO L87 Difference]: Start difference. First operand 50 states and 67 transitions. Second operand has 11 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 15:02:40,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:02:40,214 INFO L93 Difference]: Finished difference Result 72 states and 94 transitions. [2021-05-02 15:02:40,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 15:02:40,229 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 29 [2021-05-02 15:02:40,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:02:40,231 INFO L225 Difference]: With dead ends: 72 [2021-05-02 15:02:40,231 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 15:02:40,231 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 127.7ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-02 15:02:40,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 15:02:40,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 63. [2021-05-02 15:02:40,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 43 states have (on average 1.3255813953488371) internal successors, (57), 47 states have internal predecessors, (57), 14 states have call successors, (14), 6 states have call predecessors, (14), 5 states have return successors, (12), 9 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-02 15:02:40,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 83 transitions. [2021-05-02 15:02:40,240 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 83 transitions. Word has length 29 [2021-05-02 15:02:40,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:02:40,241 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 83 transitions. [2021-05-02 15:02:40,241 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 15:02:40,241 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 83 transitions. [2021-05-02 15:02:40,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 15:02:40,241 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:02:40,241 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:02:40,461 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:02:40,461 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:02:40,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:02:40,462 INFO L82 PathProgramCache]: Analyzing trace with hash 1154059858, now seen corresponding path program 1 times [2021-05-02 15:02:40,462 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:02:40,462 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [370222981] [2021-05-02 15:02:40,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:02:40,477 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:02:40,478 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1343009591] [2021-05-02 15:02:40,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 15:02:40,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:02:40,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 15:02:40,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:02:40,530 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:40,533 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:40,533 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:40,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:40,560 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:40,562 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:40,577 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:40,579 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:40,596 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:02:40,596 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:02:40,596 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [370222981] [2021-05-02 15:02:40,596 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:02:40,596 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1343009591] [2021-05-02 15:02:40,596 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1343009591] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:02:40,596 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:02:40,596 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 15:02:40,596 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131986052] [2021-05-02 15:02:40,597 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 15:02:40,597 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:02:40,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 15:02:40,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 15:02:40,597 INFO L87 Difference]: Start difference. First operand 63 states and 83 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 15:02:40,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:02:40,629 INFO L93 Difference]: Finished difference Result 119 states and 159 transitions. [2021-05-02 15:02:40,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 15:02:40,629 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 35 [2021-05-02 15:02:40,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:02:40,630 INFO L225 Difference]: With dead ends: 119 [2021-05-02 15:02:40,630 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 15:02:40,630 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 11.6ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 15:02:40,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 15:02:40,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-05-02 15:02:40,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 49 states have (on average 1.2857142857142858) internal successors, (63), 53 states have internal predecessors, (63), 15 states have call successors, (15), 7 states have call predecessors, (15), 6 states have return successors, (13), 10 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 15:02:40,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 91 transitions. [2021-05-02 15:02:40,640 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 91 transitions. Word has length 35 [2021-05-02 15:02:40,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:02:40,640 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 91 transitions. [2021-05-02 15:02:40,640 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 15:02:40,640 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 91 transitions. [2021-05-02 15:02:40,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 15:02:40,641 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:02:40,641 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:02:40,842 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:02:40,842 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:02:40,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:02:40,842 INFO L82 PathProgramCache]: Analyzing trace with hash 1810200309, now seen corresponding path program 1 times [2021-05-02 15:02:40,842 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:02:40,842 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1577823204] [2021-05-02 15:02:40,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:02:40,849 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:02:40,849 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1248008594] [2021-05-02 15:02:40,849 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 15:02:40,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:02:40,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 15:02:40,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:02:40,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:40,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:40,963 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:40,966 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:40,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:40,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:40,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:40,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:40,985 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:40,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:40,989 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:40,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:40,993 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:40,994 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:40,996 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:40,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,007 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,009 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,010 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,013 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,014 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,018 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,020 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,022 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,023 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,027 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,029 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,030 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,032 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,033 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,035 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,037 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,038 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,040 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,041 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,060 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,061 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,063 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,066 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:02:41,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:32,547 WARN L205 SmtUtils]: Spent 51.46 s on a formula simplification that was a NOOP. DAG size: 28 [2021-05-02 15:03:32,550 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:32,553 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:32,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:32,564 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:32,566 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:32,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:32,594 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:32,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:32,599 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:32,601 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:32,603 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:32,605 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:32,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:32,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:32,611 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:32,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:32,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:32,644 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 15:03:32,644 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:03:32,644 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1577823204] [2021-05-02 15:03:32,644 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:03:32,644 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1248008594] [2021-05-02 15:03:32,644 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1248008594] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:03:32,644 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:03:32,644 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 15:03:32,644 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394570224] [2021-05-02 15:03:32,645 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 15:03:32,645 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:03:32,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 15:03:32,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2021-05-02 15:03:32,645 INFO L87 Difference]: Start difference. First operand 71 states and 91 transitions. Second operand has 12 states, 12 states have (on average 2.25) internal successors, (27), 9 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 15:03:45,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:03:45,685 INFO L93 Difference]: Finished difference Result 104 states and 136 transitions. [2021-05-02 15:03:45,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 15:03:45,701 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 9 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 39 [2021-05-02 15:03:45,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:03:45,702 INFO L225 Difference]: With dead ends: 104 [2021-05-02 15:03:45,702 INFO L226 Difference]: Without dead ends: 102 [2021-05-02 15:03:45,703 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 51659.2ms TimeCoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-02 15:03:45,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-05-02 15:03:45,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 100. [2021-05-02 15:03:45,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 70 states have (on average 1.3142857142857143) internal successors, (92), 77 states have internal predecessors, (92), 21 states have call successors, (21), 9 states have call predecessors, (21), 8 states have return successors, (19), 13 states have call predecessors, (19), 19 states have call successors, (19) [2021-05-02 15:03:45,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 132 transitions. [2021-05-02 15:03:45,723 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 132 transitions. Word has length 39 [2021-05-02 15:03:45,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:03:45,724 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 132 transitions. [2021-05-02 15:03:45,724 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 9 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 15:03:45,724 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 132 transitions. [2021-05-02 15:03:45,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 15:03:45,730 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:03:45,730 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:03:45,945 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:03:45,945 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:03:45,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:03:45,945 INFO L82 PathProgramCache]: Analyzing trace with hash -174895632, now seen corresponding path program 1 times [2021-05-02 15:03:45,946 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:03:45,946 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1596029173] [2021-05-02 15:03:45,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:03:45,956 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:03:45,957 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1347318284] [2021-05-02 15:03:45,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:03:46,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:03:46,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 15:03:46,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:03:46,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,034 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,035 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,036 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,049 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,050 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,065 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,066 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,076 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:03:46,077 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:03:46,077 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1596029173] [2021-05-02 15:03:46,077 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:03:46,077 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1347318284] [2021-05-02 15:03:46,077 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1347318284] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:03:46,077 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:03:46,077 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 15:03:46,077 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760246668] [2021-05-02 15:03:46,077 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 15:03:46,077 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:03:46,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 15:03:46,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:03:46,078 INFO L87 Difference]: Start difference. First operand 100 states and 132 transitions. Second operand has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 15:03:46,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:03:46,124 INFO L93 Difference]: Finished difference Result 186 states and 251 transitions. [2021-05-02 15:03:46,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 15:03:46,124 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 41 [2021-05-02 15:03:46,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:03:46,125 INFO L225 Difference]: With dead ends: 186 [2021-05-02 15:03:46,125 INFO L226 Difference]: Without dead ends: 109 [2021-05-02 15:03:46,126 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 11.1ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:03:46,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-02 15:03:46,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 108. [2021-05-02 15:03:46,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 76 states have (on average 1.3026315789473684) internal successors, (99), 83 states have internal predecessors, (99), 22 states have call successors, (22), 10 states have call predecessors, (22), 9 states have return successors, (20), 14 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-02 15:03:46,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 141 transitions. [2021-05-02 15:03:46,137 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 141 transitions. Word has length 41 [2021-05-02 15:03:46,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:03:46,137 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 141 transitions. [2021-05-02 15:03:46,137 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 15:03:46,137 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 141 transitions. [2021-05-02 15:03:46,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 15:03:46,138 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:03:46,138 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:03:46,338 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:03:46,339 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:03:46,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:03:46,339 INFO L82 PathProgramCache]: Analyzing trace with hash -1292932747, now seen corresponding path program 1 times [2021-05-02 15:03:46,339 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:03:46,339 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [799857929] [2021-05-02 15:03:46,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:03:46,345 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:03:46,345 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [455613418] [2021-05-02 15:03:46,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 15:03:46,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:03:46,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 15:03:46,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:03:46,415 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,450 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,451 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,451 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,467 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,485 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:03:46,485 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:03:46,485 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [799857929] [2021-05-02 15:03:46,485 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:03:46,485 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [455613418] [2021-05-02 15:03:46,485 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [455613418] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:03:46,485 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:03:46,486 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 15:03:46,486 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1315255999] [2021-05-02 15:03:46,486 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 15:03:46,486 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:03:46,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 15:03:46,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:03:46,486 INFO L87 Difference]: Start difference. First operand 108 states and 141 transitions. Second operand has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 15:03:46,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:03:46,531 INFO L93 Difference]: Finished difference Result 168 states and 224 transitions. [2021-05-02 15:03:46,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 15:03:46,531 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 43 [2021-05-02 15:03:46,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:03:46,532 INFO L225 Difference]: With dead ends: 168 [2021-05-02 15:03:46,532 INFO L226 Difference]: Without dead ends: 110 [2021-05-02 15:03:46,533 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 18.3ms TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-02 15:03:46,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-02 15:03:46,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 110. [2021-05-02 15:03:46,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 78 states have (on average 1.294871794871795) internal successors, (101), 85 states have internal predecessors, (101), 22 states have call successors, (22), 10 states have call predecessors, (22), 9 states have return successors, (20), 14 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-02 15:03:46,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 143 transitions. [2021-05-02 15:03:46,544 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 143 transitions. Word has length 43 [2021-05-02 15:03:46,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:03:46,544 INFO L480 AbstractCegarLoop]: Abstraction has 110 states and 143 transitions. [2021-05-02 15:03:46,544 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 15:03:46,544 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 143 transitions. [2021-05-02 15:03:46,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 15:03:46,552 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:03:46,552 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:03:46,765 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-05-02 15:03:46,765 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:03:46,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:03:46,765 INFO L82 PathProgramCache]: Analyzing trace with hash 1407897436, now seen corresponding path program 1 times [2021-05-02 15:03:46,765 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:03:46,765 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1882078831] [2021-05-02 15:03:46,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:03:46,776 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:03:46,777 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1640571987] [2021-05-02 15:03:46,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 15:03:46,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:03:46,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 15:03:46,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:03:46,850 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,851 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:46,890 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 15:03:46,890 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:03:46,890 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1882078831] [2021-05-02 15:03:46,890 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:03:46,890 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1640571987] [2021-05-02 15:03:46,890 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1640571987] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:03:46,890 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:03:46,890 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 15:03:46,891 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [70119370] [2021-05-02 15:03:46,891 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 15:03:46,892 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:03:46,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 15:03:46,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-05-02 15:03:46,892 INFO L87 Difference]: Start difference. First operand 110 states and 143 transitions. Second operand has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-02 15:03:46,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:03:46,938 INFO L93 Difference]: Finished difference Result 209 states and 291 transitions. [2021-05-02 15:03:46,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 15:03:46,939 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 47 [2021-05-02 15:03:46,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:03:46,940 INFO L225 Difference]: With dead ends: 209 [2021-05-02 15:03:46,940 INFO L226 Difference]: Without dead ends: 132 [2021-05-02 15:03:46,941 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.5ms TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-05-02 15:03:46,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-05-02 15:03:46,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 83. [2021-05-02 15:03:46,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 58 states have (on average 1.2413793103448276) internal successors, (72), 62 states have internal predecessors, (72), 17 states have call successors, (17), 8 states have call predecessors, (17), 7 states have return successors, (15), 12 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-02 15:03:46,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 104 transitions. [2021-05-02 15:03:46,950 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 104 transitions. Word has length 47 [2021-05-02 15:03:46,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:03:46,950 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 104 transitions. [2021-05-02 15:03:46,951 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-02 15:03:46,951 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 104 transitions. [2021-05-02 15:03:46,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 15:03:46,951 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:03:46,951 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:03:47,165 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:03:47,165 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:03:47,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:03:47,165 INFO L82 PathProgramCache]: Analyzing trace with hash -105484190, now seen corresponding path program 1 times [2021-05-02 15:03:47,165 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:03:47,165 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [310817812] [2021-05-02 15:03:47,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:03:47,171 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:03:47,171 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1134833966] [2021-05-02 15:03:47,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:03:47,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:03:47,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-02 15:03:47,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:03:47,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:47,279 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:47,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:47,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:47,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:47,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:47,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:03:47,347 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:04:11,224 WARN L205 SmtUtils]: Spent 21.56 s on a formula simplification that was a NOOP. DAG size: 32 [2021-05-02 15:04:11,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:04:11,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:04:25,434 WARN L205 SmtUtils]: Spent 6.04 s on a formula simplification that was a NOOP. DAG size: 34 [2021-05-02 15:04:25,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:04:25,464 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:04:25,501 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 8 proven. 7 refuted. 3 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 15:04:25,501 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:04:25,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [310817812] [2021-05-02 15:04:25,501 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:04:25,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1134833966] [2021-05-02 15:04:25,501 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1134833966] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:04:25,501 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:04:25,502 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 15:04:25,502 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933678776] [2021-05-02 15:04:25,502 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 15:04:25,502 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:04:25,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 15:04:25,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=104, Unknown=5, NotChecked=0, Total=132 [2021-05-02 15:04:25,502 INFO L87 Difference]: Start difference. First operand 83 states and 104 transitions. Second operand has 12 states, 12 states have (on average 2.5) internal successors, (30), 10 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 15:05:02,798 WARN L205 SmtUtils]: Spent 8.81 s on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 15:05:58,019 WARN L205 SmtUtils]: Spent 18.75 s on a formula simplification that was a NOOP. DAG size: 40 [2021-05-02 15:06:33,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:06:33,177 INFO L93 Difference]: Finished difference Result 108 states and 135 transitions. [2021-05-02 15:06:33,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 15:06:33,196 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 10 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 47 [2021-05-02 15:06:33,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:06:33,197 INFO L225 Difference]: With dead ends: 108 [2021-05-02 15:06:33,197 INFO L226 Difference]: Without dead ends: 106 [2021-05-02 15:06:33,198 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 91374.1ms TimeCoverageRelationStatistics Valid=52, Invalid=239, Unknown=15, NotChecked=0, Total=306 [2021-05-02 15:06:33,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-05-02 15:06:33,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 103. [2021-05-02 15:06:33,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 72 states have (on average 1.25) internal successors, (90), 78 states have internal predecessors, (90), 21 states have call successors, (21), 10 states have call predecessors, (21), 9 states have return successors, (19), 14 states have call predecessors, (19), 19 states have call successors, (19) [2021-05-02 15:06:33,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 130 transitions. [2021-05-02 15:06:33,206 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 130 transitions. Word has length 47 [2021-05-02 15:06:33,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:06:33,206 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 130 transitions. [2021-05-02 15:06:33,206 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 10 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 15:06:33,206 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 130 transitions. [2021-05-02 15:06:33,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 15:06:33,207 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:06:33,207 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:06:33,424 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:06:33,424 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:06:33,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:06:33,424 INFO L82 PathProgramCache]: Analyzing trace with hash 1335036056, now seen corresponding path program 2 times [2021-05-02 15:06:33,424 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:06:33,425 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [340424971] [2021-05-02 15:06:33,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:06:33,442 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:06:33,443 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1351144681] [2021-05-02 15:06:33,443 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:06:33,493 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:06:33,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:06:33,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 15:06:33,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:06:33,520 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,521 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,523 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,543 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,550 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,553 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,554 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,555 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,556 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,560 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,576 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,577 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,582 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,584 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,586 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,587 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,588 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,648 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,652 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,656 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,663 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,664 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,665 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,667 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,672 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,676 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,695 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,696 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,697 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,698 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,699 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,707 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,712 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,713 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,746 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,748 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,750 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,753 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,754 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,755 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,763 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,775 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,776 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,780 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,782 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,833 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,835 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,836 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,838 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,871 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,872 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,879 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:33,940 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 7 proven. 18 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 15:06:33,940 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:06:33,940 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [340424971] [2021-05-02 15:06:33,940 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:06:33,940 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1351144681] [2021-05-02 15:06:33,940 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1351144681] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:06:33,940 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:06:33,941 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-02 15:06:33,941 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419892677] [2021-05-02 15:06:33,941 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 15:06:33,941 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:06:33,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 15:06:33,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2021-05-02 15:06:33,941 INFO L87 Difference]: Start difference. First operand 103 states and 130 transitions. Second operand has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 11 states have internal predecessors, (30), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 15:06:52,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:06:52,826 INFO L93 Difference]: Finished difference Result 248 states and 353 transitions. [2021-05-02 15:06:52,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 15:06:52,829 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 11 states have internal predecessors, (30), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 47 [2021-05-02 15:06:52,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:06:52,835 INFO L225 Difference]: With dead ends: 248 [2021-05-02 15:06:52,835 INFO L226 Difference]: Without dead ends: 246 [2021-05-02 15:06:52,835 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 254.1ms TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-05-02 15:06:52,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2021-05-02 15:06:52,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 195. [2021-05-02 15:06:52,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 139 states have (on average 1.3453237410071943) internal successors, (187), 153 states have internal predecessors, (187), 44 states have call successors, (44), 12 states have call predecessors, (44), 11 states have return successors, (42), 29 states have call predecessors, (42), 42 states have call successors, (42) [2021-05-02 15:06:52,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 273 transitions. [2021-05-02 15:06:52,866 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 273 transitions. Word has length 47 [2021-05-02 15:06:52,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:06:52,867 INFO L480 AbstractCegarLoop]: Abstraction has 195 states and 273 transitions. [2021-05-02 15:06:52,867 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 11 states have internal predecessors, (30), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 15:06:52,867 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 273 transitions. [2021-05-02 15:06:52,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 15:06:52,868 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:06:52,868 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:06:53,084 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-02 15:06:53,085 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:06:53,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:06:53,085 INFO L82 PathProgramCache]: Analyzing trace with hash 1915058849, now seen corresponding path program 1 times [2021-05-02 15:06:53,085 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:06:53,085 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [230715154] [2021-05-02 15:06:53,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:06:53,090 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:06:53,090 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2057171421] [2021-05-02 15:06:53,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 15:06:53,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:06:53,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 15:06:53,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:06:53,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,161 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,202 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,203 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,203 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,219 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,220 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,233 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:06:53,233 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:06:53,233 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [230715154] [2021-05-02 15:06:53,233 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:06:53,234 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2057171421] [2021-05-02 15:06:53,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2057171421] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:06:53,234 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:06:53,234 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 15:06:53,234 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992741205] [2021-05-02 15:06:53,234 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 15:06:53,235 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:06:53,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 15:06:53,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 15:06:53,236 INFO L87 Difference]: Start difference. First operand 195 states and 273 transitions. Second operand has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 6 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 15:06:53,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:06:53,311 INFO L93 Difference]: Finished difference Result 344 states and 492 transitions. [2021-05-02 15:06:53,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:06:53,311 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 6 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 49 [2021-05-02 15:06:53,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:06:53,314 INFO L225 Difference]: With dead ends: 344 [2021-05-02 15:06:53,314 INFO L226 Difference]: Without dead ends: 200 [2021-05-02 15:06:53,314 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 23.5ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:06:53,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-05-02 15:06:53,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 199. [2021-05-02 15:06:53,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 143 states have (on average 1.3286713286713288) internal successors, (190), 155 states have internal predecessors, (190), 43 states have call successors, (43), 13 states have call predecessors, (43), 12 states have return successors, (41), 30 states have call predecessors, (41), 41 states have call successors, (41) [2021-05-02 15:06:53,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 274 transitions. [2021-05-02 15:06:53,356 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 274 transitions. Word has length 49 [2021-05-02 15:06:53,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:06:53,356 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 274 transitions. [2021-05-02 15:06:53,357 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 6 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 15:06:53,357 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 274 transitions. [2021-05-02 15:06:53,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 15:06:53,357 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:06:53,357 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:06:53,572 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:06:53,573 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:06:53,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:06:53,573 INFO L82 PathProgramCache]: Analyzing trace with hash -60460648, now seen corresponding path program 2 times [2021-05-02 15:06:53,573 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:06:53,573 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [926370891] [2021-05-02 15:06:53,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:06:53,577 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:06:53,578 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1170706218] [2021-05-02 15:06:53,578 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 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 15:06:53,621 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:06:53,621 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:06:53,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 15:06:53,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:06:53,630 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,654 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,671 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,672 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,672 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,690 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,690 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,710 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:53,729 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 20 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:06:53,729 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:06:53,729 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [926370891] [2021-05-02 15:06:53,729 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:06:53,729 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1170706218] [2021-05-02 15:06:53,729 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1170706218] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:06:53,729 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:06:53,729 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 15:06:53,729 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1841995326] [2021-05-02 15:06:53,730 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 15:06:53,730 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:06:53,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 15:06:53,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 15:06:53,730 INFO L87 Difference]: Start difference. First operand 199 states and 274 transitions. Second operand has 7 states, 7 states have (on average 4.857142857142857) internal successors, (34), 6 states have internal predecessors, (34), 6 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 15:06:53,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:06:53,830 INFO L93 Difference]: Finished difference Result 283 states and 394 transitions. [2021-05-02 15:06:53,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 15:06:53,831 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.857142857142857) internal successors, (34), 6 states have internal predecessors, (34), 6 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 51 [2021-05-02 15:06:53,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:06:53,833 INFO L225 Difference]: With dead ends: 283 [2021-05-02 15:06:53,833 INFO L226 Difference]: Without dead ends: 201 [2021-05-02 15:06:53,833 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 32.0ms TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-02 15:06:53,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2021-05-02 15:06:53,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 201. [2021-05-02 15:06:53,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 145 states have (on average 1.3241379310344827) internal successors, (192), 157 states have internal predecessors, (192), 43 states have call successors, (43), 13 states have call predecessors, (43), 12 states have return successors, (41), 30 states have call predecessors, (41), 41 states have call successors, (41) [2021-05-02 15:06:53,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 276 transitions. [2021-05-02 15:06:53,852 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 276 transitions. Word has length 51 [2021-05-02 15:06:53,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:06:53,853 INFO L480 AbstractCegarLoop]: Abstraction has 201 states and 276 transitions. [2021-05-02 15:06:53,853 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.857142857142857) internal successors, (34), 6 states have internal predecessors, (34), 6 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 15:06:53,853 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 276 transitions. [2021-05-02 15:06:53,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 15:06:53,854 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:06:53,854 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:06:54,068 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 15:06:54,069 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:06:54,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:06:54,069 INFO L82 PathProgramCache]: Analyzing trace with hash -1067781299, now seen corresponding path program 1 times [2021-05-02 15:06:54,069 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:06:54,069 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [180485536] [2021-05-02 15:06:54,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:06:54,087 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:06:54,088 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1898685001] [2021-05-02 15:06:54,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 15:06:54,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:06:54,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 15:06:54,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:06:54,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:54,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:54,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:54,161 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:54,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:54,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:54,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:54,189 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:54,190 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:54,205 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:54,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:54,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:54,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:54,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:54,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:54,241 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:54,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:54,253 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 8 proven. 30 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:06:54,254 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:06:54,254 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [180485536] [2021-05-02 15:06:54,254 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:06:54,254 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1898685001] [2021-05-02 15:06:54,254 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1898685001] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:06:54,254 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:06:54,254 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 15:06:54,254 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423936101] [2021-05-02 15:06:54,254 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 15:06:54,254 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:06:54,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 15:06:54,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:06:54,255 INFO L87 Difference]: Start difference. First operand 201 states and 276 transitions. Second operand has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-05-02 15:06:54,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:06:54,339 INFO L93 Difference]: Finished difference Result 226 states and 303 transitions. [2021-05-02 15:06:54,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 15:06:54,340 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) Word has length 55 [2021-05-02 15:06:54,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:06:54,341 INFO L225 Difference]: With dead ends: 226 [2021-05-02 15:06:54,341 INFO L226 Difference]: Without dead ends: 219 [2021-05-02 15:06:54,342 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 29.8ms TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 15:06:54,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2021-05-02 15:06:54,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 214. [2021-05-02 15:06:54,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 154 states have (on average 1.3051948051948052) internal successors, (201), 167 states have internal predecessors, (201), 45 states have call successors, (45), 15 states have call predecessors, (45), 14 states have return successors, (43), 31 states have call predecessors, (43), 43 states have call successors, (43) [2021-05-02 15:06:54,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 289 transitions. [2021-05-02 15:06:54,358 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 289 transitions. Word has length 55 [2021-05-02 15:06:54,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:06:54,358 INFO L480 AbstractCegarLoop]: Abstraction has 214 states and 289 transitions. [2021-05-02 15:06:54,358 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-05-02 15:06:54,359 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 289 transitions. [2021-05-02 15:06:54,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 15:06:54,359 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:06:54,359 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:06:54,572 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:06:54,575 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:06:54,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:06:54,575 INFO L82 PathProgramCache]: Analyzing trace with hash 1713804371, now seen corresponding path program 2 times [2021-05-02 15:06:54,575 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:06:54,575 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2005659997] [2021-05-02 15:06:54,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:06:54,581 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:06:54,581 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1315764921] [2021-05-02 15:06:54,581 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 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 15:06:54,723 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:06:54,723 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:06:54,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 15:06:54,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:06:54,753 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:54,755 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:54,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:06:54,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:07:04,898 WARN L205 SmtUtils]: Spent 8.06 s on a formula simplification that was a NOOP. DAG size: 32 [2021-05-02 15:07:04,913 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:07:04,916 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:07:04,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:07:04,952 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:07:22,566 WARN L205 SmtUtils]: Spent 9.36 s on a formula simplification that was a NOOP. DAG size: 34 [2021-05-02 15:07:22,587 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:07:22,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:07:47,785 WARN L205 SmtUtils]: Spent 6.06 s on a formula simplification that was a NOOP. DAG size: 36 [2021-05-02 15:07:47,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:07:47,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:07:47,834 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 12 proven. 14 refuted. 7 times theorem prover too weak. 13 trivial. 0 not checked. [2021-05-02 15:07:47,834 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:07:47,834 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2005659997] [2021-05-02 15:07:47,834 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:07:47,834 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1315764921] [2021-05-02 15:07:47,834 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1315764921] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:07:47,834 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:07:47,834 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 15:07:47,835 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918538881] [2021-05-02 15:07:47,835 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 15:07:47,835 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:07:47,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 15:07:47,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=121, Unknown=10, NotChecked=0, Total=156 [2021-05-02 15:07:47,835 INFO L87 Difference]: Start difference. First operand 214 states and 289 transitions. Second operand has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 11 states have internal predecessors, (33), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 4 states have call predecessors, (7), 5 states have call successors, (7) [2021-05-02 15:08:41,673 WARN L205 SmtUtils]: Spent 13.72 s on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 15:09:27,178 WARN L205 SmtUtils]: Spent 14.70 s on a formula simplification that was a NOOP. DAG size: 40 [2021-05-02 15:10:35,563 WARN L205 SmtUtils]: Spent 8.07 s on a formula simplification that was a NOOP. DAG size: 42 [2021-05-02 15:12:12,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:12:12,048 INFO L93 Difference]: Finished difference Result 367 states and 527 transitions. [2021-05-02 15:12:12,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 15:12:12,049 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 11 states have internal predecessors, (33), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 4 states have call predecessors, (7), 5 states have call successors, (7) Word has length 55 [2021-05-02 15:12:12,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:12:12,051 INFO L225 Difference]: With dead ends: 367 [2021-05-02 15:12:12,051 INFO L226 Difference]: Without dead ends: 365 [2021-05-02 15:12:12,065 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 146664.8ms TimeCoverageRelationStatistics Valid=58, Invalid=294, Unknown=28, NotChecked=0, Total=380 [2021-05-02 15:12:12,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365 states. [2021-05-02 15:12:12,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365 to 274. [2021-05-02 15:12:12,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 274 states, 198 states have (on average 1.3232323232323233) internal successors, (262), 215 states have internal predecessors, (262), 59 states have call successors, (59), 17 states have call predecessors, (59), 16 states have return successors, (57), 41 states have call predecessors, (57), 57 states have call successors, (57) [2021-05-02 15:12:12,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 378 transitions. [2021-05-02 15:12:12,096 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 378 transitions. Word has length 55 [2021-05-02 15:12:12,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:12:12,097 INFO L480 AbstractCegarLoop]: Abstraction has 274 states and 378 transitions. [2021-05-02 15:12:12,097 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 11 states have internal predecessors, (33), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 4 states have call predecessors, (7), 5 states have call successors, (7) [2021-05-02 15:12:12,097 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 378 transitions. [2021-05-02 15:12:12,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 15:12:12,097 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:12:12,098 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:12:12,300 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 15:12:12,301 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:12:12,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:12:12,301 INFO L82 PathProgramCache]: Analyzing trace with hash 181776133, now seen corresponding path program 1 times [2021-05-02 15:12:12,301 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:12:12,301 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1047953646] [2021-05-02 15:12:12,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:12:12,305 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:12:12,305 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2079241862] [2021-05-02 15:12:12,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:12:12,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:12:12,352 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 15:12:12,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:12:12,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:12,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:12,409 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:12,410 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:12,421 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:12,425 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:12,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:12,439 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:12,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:12,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:12,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:12,463 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:12,472 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 15:12:12,472 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:12:12,472 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1047953646] [2021-05-02 15:12:12,472 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:12:12,472 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2079241862] [2021-05-02 15:12:12,473 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2079241862] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:12:12,473 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:12:12,473 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2021-05-02 15:12:12,473 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075130803] [2021-05-02 15:12:12,473 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 15:12:12,473 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:12:12,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 15:12:12,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 15:12:12,474 INFO L87 Difference]: Start difference. First operand 274 states and 378 transitions. Second operand has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 4 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 15:12:12,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:12:12,569 INFO L93 Difference]: Finished difference Result 521 states and 752 transitions. [2021-05-02 15:12:12,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 15:12:12,570 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 4 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 55 [2021-05-02 15:12:12,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:12:12,571 INFO L225 Difference]: With dead ends: 521 [2021-05-02 15:12:12,571 INFO L226 Difference]: Without dead ends: 341 [2021-05-02 15:12:12,572 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 17.6ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 15:12:12,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 341 states. [2021-05-02 15:12:12,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 341 to 328. [2021-05-02 15:12:12,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 328 states, 240 states have (on average 1.3208333333333333) internal successors, (317), 257 states have internal predecessors, (317), 71 states have call successors, (71), 17 states have call predecessors, (71), 16 states have return successors, (69), 53 states have call predecessors, (69), 69 states have call successors, (69) [2021-05-02 15:12:12,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 457 transitions. [2021-05-02 15:12:12,605 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 457 transitions. Word has length 55 [2021-05-02 15:12:12,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:12:12,606 INFO L480 AbstractCegarLoop]: Abstraction has 328 states and 457 transitions. [2021-05-02 15:12:12,606 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 4 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 15:12:12,606 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 457 transitions. [2021-05-02 15:12:12,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 15:12:12,606 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:12:12,606 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:12:12,824 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 15:12:12,827 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:12:12,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:12:12,827 INFO L82 PathProgramCache]: Analyzing trace with hash 1622296379, now seen corresponding path program 3 times [2021-05-02 15:12:12,827 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:12:12,827 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [478406662] [2021-05-02 15:12:12,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:12:12,832 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:12:12,832 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1927766375] [2021-05-02 15:12:12,833 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 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 15:12:12,942 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 15:12:12,942 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:12:12,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 15:12:12,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:12:13,042 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:13,044 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:13,072 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 27 proven. 1 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-05-02 15:12:13,072 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:12:13,072 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [478406662] [2021-05-02 15:12:13,072 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:12:13,072 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1927766375] [2021-05-02 15:12:13,072 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1927766375] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:12:13,072 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:12:13,073 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 15:12:13,073 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [805433370] [2021-05-02 15:12:13,073 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 15:12:13,073 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:12:13,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 15:12:13,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-02 15:12:13,075 INFO L87 Difference]: Start difference. First operand 328 states and 457 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) [2021-05-02 15:12:17,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:12:17,233 INFO L93 Difference]: Finished difference Result 341 states and 473 transitions. [2021-05-02 15:12:17,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 15:12:17,234 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) Word has length 55 [2021-05-02 15:12:17,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:12:17,235 INFO L225 Difference]: With dead ends: 341 [2021-05-02 15:12:17,235 INFO L226 Difference]: Without dead ends: 339 [2021-05-02 15:12:17,236 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 58.4ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-02 15:12:17,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2021-05-02 15:12:17,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 338. [2021-05-02 15:12:17,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 338 states, 247 states have (on average 1.319838056680162) internal successors, (326), 266 states have internal predecessors, (326), 73 states have call successors, (73), 18 states have call predecessors, (73), 17 states have return successors, (71), 53 states have call predecessors, (71), 71 states have call successors, (71) [2021-05-02 15:12:17,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 470 transitions. [2021-05-02 15:12:17,262 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 470 transitions. Word has length 55 [2021-05-02 15:12:17,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:12:17,262 INFO L480 AbstractCegarLoop]: Abstraction has 338 states and 470 transitions. [2021-05-02 15:12:17,263 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) [2021-05-02 15:12:17,263 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 470 transitions. [2021-05-02 15:12:17,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 15:12:17,263 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:12:17,263 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:12:17,468 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 15:12:17,469 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:12:17,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:12:17,469 INFO L82 PathProgramCache]: Analyzing trace with hash -2095290798, now seen corresponding path program 2 times [2021-05-02 15:12:17,469 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:12:17,469 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [266347133] [2021-05-02 15:12:17,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:12:17,473 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:12:17,473 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2044897951] [2021-05-02 15:12:17,473 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 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 15:12:17,518 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:12:17,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:12:17,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 15:12:17,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:12:17,529 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:17,531 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:17,531 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:17,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:17,569 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:17,569 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:17,588 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:17,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:17,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:17,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:17,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:17,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:17,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:17,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:17,635 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:17,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:17,669 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:17,685 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 10 proven. 32 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:12:17,685 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:12:17,685 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [266347133] [2021-05-02 15:12:17,685 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:12:17,685 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2044897951] [2021-05-02 15:12:17,685 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2044897951] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:12:17,685 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:12:17,685 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 15:12:17,685 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421443887] [2021-05-02 15:12:17,686 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 15:12:17,686 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:12:17,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 15:12:17,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:12:17,686 INFO L87 Difference]: Start difference. First operand 338 states and 470 transitions. Second operand has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-05-02 15:12:17,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:12:17,798 INFO L93 Difference]: Finished difference Result 553 states and 787 transitions. [2021-05-02 15:12:17,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 15:12:17,799 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) Word has length 57 [2021-05-02 15:12:17,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:12:17,800 INFO L225 Difference]: With dead ends: 553 [2021-05-02 15:12:17,800 INFO L226 Difference]: Without dead ends: 317 [2021-05-02 15:12:17,801 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 51.0ms TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:12:17,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2021-05-02 15:12:17,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 316. [2021-05-02 15:12:17,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 232 states have (on average 1.3060344827586208) internal successors, (303), 247 states have internal predecessors, (303), 66 states have call successors, (66), 18 states have call predecessors, (66), 17 states have return successors, (64), 50 states have call predecessors, (64), 64 states have call successors, (64) [2021-05-02 15:12:17,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 433 transitions. [2021-05-02 15:12:17,821 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 433 transitions. Word has length 57 [2021-05-02 15:12:17,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:12:17,821 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 433 transitions. [2021-05-02 15:12:17,821 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-05-02 15:12:17,821 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 433 transitions. [2021-05-02 15:12:17,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 15:12:17,821 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:12:17,821 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:12:18,038 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 15:12:18,039 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:12:18,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:12:18,039 INFO L82 PathProgramCache]: Analyzing trace with hash -659642693, now seen corresponding path program 3 times [2021-05-02 15:12:18,039 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:12:18,039 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [884993429] [2021-05-02 15:12:18,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:12:18,043 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:12:18,043 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1277941799] [2021-05-02 15:12:18,043 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 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 15:12:18,182 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 15:12:18,182 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:12:18,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 15:12:18,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:12:18,195 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,202 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,222 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,241 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,243 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,243 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,275 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,299 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,319 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,337 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 10 proven. 42 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:12:18,337 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:12:18,337 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [884993429] [2021-05-02 15:12:18,337 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:12:18,338 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1277941799] [2021-05-02 15:12:18,338 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1277941799] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:12:18,338 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:12:18,338 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 15:12:18,338 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083887326] [2021-05-02 15:12:18,339 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 15:12:18,339 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:12:18,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 15:12:18,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:12:18,339 INFO L87 Difference]: Start difference. First operand 316 states and 433 transitions. Second operand has 8 states, 8 states have (on average 5.0) internal successors, (40), 7 states have internal predecessors, (40), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-05-02 15:12:18,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:12:18,504 INFO L93 Difference]: Finished difference Result 395 states and 546 transitions. [2021-05-02 15:12:18,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 15:12:18,505 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 7 states have internal predecessors, (40), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) Word has length 59 [2021-05-02 15:12:18,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:12:18,506 INFO L225 Difference]: With dead ends: 395 [2021-05-02 15:12:18,507 INFO L226 Difference]: Without dead ends: 318 [2021-05-02 15:12:18,507 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 64.8ms TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-05-02 15:12:18,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 318 states. [2021-05-02 15:12:18,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 318 to 318. [2021-05-02 15:12:18,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 318 states, 234 states have (on average 1.3034188034188035) internal successors, (305), 249 states have internal predecessors, (305), 66 states have call successors, (66), 18 states have call predecessors, (66), 17 states have return successors, (64), 50 states have call predecessors, (64), 64 states have call successors, (64) [2021-05-02 15:12:18,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 435 transitions. [2021-05-02 15:12:18,531 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 435 transitions. Word has length 59 [2021-05-02 15:12:18,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:12:18,532 INFO L480 AbstractCegarLoop]: Abstraction has 318 states and 435 transitions. [2021-05-02 15:12:18,532 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 7 states have internal predecessors, (40), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-05-02 15:12:18,532 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 435 transitions. [2021-05-02 15:12:18,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 15:12:18,534 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:12:18,534 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:12:18,737 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:12:18,737 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:12:18,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:12:18,737 INFO L82 PathProgramCache]: Analyzing trace with hash -1402694082, now seen corresponding path program 2 times [2021-05-02 15:12:18,737 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:12:18,737 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [166296991] [2021-05-02 15:12:18,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:12:18,746 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:12:18,746 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1518161298] [2021-05-02 15:12:18,746 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 15:12:18,784 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:12:18,784 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:12:18,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 15:12:18,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:12:18,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,796 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,816 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,817 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,817 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,833 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,835 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,835 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,853 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,854 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,854 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,874 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,898 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,898 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,921 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:18,937 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 10 proven. 54 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:12:18,937 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:12:18,937 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [166296991] [2021-05-02 15:12:18,937 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:12:18,937 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1518161298] [2021-05-02 15:12:18,937 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1518161298] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:12:18,938 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:12:18,938 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 15:12:18,938 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401665356] [2021-05-02 15:12:18,938 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 15:12:18,938 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:12:18,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 15:12:18,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 15:12:18,938 INFO L87 Difference]: Start difference. First operand 318 states and 435 transitions. Second operand has 9 states, 9 states have (on average 4.666666666666667) internal successors, (42), 8 states have internal predecessors, (42), 8 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (8), 6 states have call predecessors, (8), 7 states have call successors, (8) [2021-05-02 15:12:19,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:12:19,088 INFO L93 Difference]: Finished difference Result 355 states and 476 transitions. [2021-05-02 15:12:19,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 15:12:19,089 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.666666666666667) internal successors, (42), 8 states have internal predecessors, (42), 8 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (8), 6 states have call predecessors, (8), 7 states have call successors, (8) Word has length 63 [2021-05-02 15:12:19,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:12:19,090 INFO L225 Difference]: With dead ends: 355 [2021-05-02 15:12:19,090 INFO L226 Difference]: Without dead ends: 348 [2021-05-02 15:12:19,090 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 62.2ms TimeCoverageRelationStatistics Valid=43, Invalid=67, Unknown=0, NotChecked=0, Total=110 [2021-05-02 15:12:19,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2021-05-02 15:12:19,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 339. [2021-05-02 15:12:19,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 339 states, 249 states have (on average 1.2931726907630523) internal successors, (322), 265 states have internal predecessors, (322), 69 states have call successors, (69), 21 states have call predecessors, (69), 20 states have return successors, (67), 52 states have call predecessors, (67), 67 states have call successors, (67) [2021-05-02 15:12:19,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 339 states to 339 states and 458 transitions. [2021-05-02 15:12:19,111 INFO L78 Accepts]: Start accepts. Automaton has 339 states and 458 transitions. Word has length 63 [2021-05-02 15:12:19,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:12:19,111 INFO L480 AbstractCegarLoop]: Abstraction has 339 states and 458 transitions. [2021-05-02 15:12:19,112 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 4.666666666666667) internal successors, (42), 8 states have internal predecessors, (42), 8 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (8), 6 states have call predecessors, (8), 7 states have call successors, (8) [2021-05-02 15:12:19,112 INFO L276 IsEmpty]: Start isEmpty. Operand 339 states and 458 transitions. [2021-05-02 15:12:19,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 15:12:19,112 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:12:19,112 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:12:19,327 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:12:19,327 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:12:19,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:12:19,327 INFO L82 PathProgramCache]: Analyzing trace with hash 1378891588, now seen corresponding path program 3 times [2021-05-02 15:12:19,327 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:12:19,327 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1855120480] [2021-05-02 15:12:19,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:12:19,331 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:12:19,331 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1515397848] [2021-05-02 15:12:19,331 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 15:12:19,466 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 15:12:19,466 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:12:19,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 15:12:19,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:12:19,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:19,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:19,650 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 32 proven. 1 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-05-02 15:12:19,650 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:12:19,650 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1855120480] [2021-05-02 15:12:19,650 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:12:19,650 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1515397848] [2021-05-02 15:12:19,650 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1515397848] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:12:19,650 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:12:19,650 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 15:12:19,651 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568280982] [2021-05-02 15:12:19,651 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 15:12:19,651 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:12:19,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 15:12:19,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:12:19,651 INFO L87 Difference]: Start difference. First operand 339 states and 458 transitions. Second operand has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 2 states have call successors, (7) [2021-05-02 15:12:21,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:12:21,901 INFO L93 Difference]: Finished difference Result 360 states and 481 transitions. [2021-05-02 15:12:21,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:12:21,902 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 2 states have call successors, (7) Word has length 63 [2021-05-02 15:12:21,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:12:21,903 INFO L225 Difference]: With dead ends: 360 [2021-05-02 15:12:21,904 INFO L226 Difference]: Without dead ends: 358 [2021-05-02 15:12:21,904 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 82.0ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:12:21,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2021-05-02 15:12:21,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 357. [2021-05-02 15:12:21,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 357 states, 263 states have (on average 1.285171102661597) internal successors, (338), 279 states have internal predecessors, (338), 71 states have call successors, (71), 23 states have call predecessors, (71), 22 states have return successors, (69), 54 states have call predecessors, (69), 69 states have call successors, (69) [2021-05-02 15:12:21,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 357 states to 357 states and 478 transitions. [2021-05-02 15:12:21,934 INFO L78 Accepts]: Start accepts. Automaton has 357 states and 478 transitions. Word has length 63 [2021-05-02 15:12:21,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:12:21,934 INFO L480 AbstractCegarLoop]: Abstraction has 357 states and 478 transitions. [2021-05-02 15:12:21,934 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 2 states have call successors, (7) [2021-05-02 15:12:21,935 INFO L276 IsEmpty]: Start isEmpty. Operand 357 states and 478 transitions. [2021-05-02 15:12:21,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 15:12:21,935 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:12:21,935 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:12:22,138 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-05-02 15:12:22,139 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:12:22,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:12:22,139 INFO L82 PathProgramCache]: Analyzing trace with hash -2023122264, now seen corresponding path program 2 times [2021-05-02 15:12:22,139 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:12:22,139 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1885994914] [2021-05-02 15:12:22,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:12:22,143 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:12:22,143 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [736119989] [2021-05-02 15:12:22,143 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 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 15:12:22,223 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:12:22,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:12:22,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 15:12:22,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:12:22,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:22,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:22,313 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:22,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:22,316 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:22,316 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:33,221 WARN L205 SmtUtils]: Spent 8.07 s on a formula simplification that was a NOOP. DAG size: 32 [2021-05-02 15:12:33,245 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:33,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:37,447 WARN L205 SmtUtils]: Spent 4.05 s on a formula simplification that was a NOOP. DAG size: 27 [2021-05-02 15:12:37,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:37,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:43,788 WARN L205 SmtUtils]: Spent 4.08 s on a formula simplification that was a NOOP. DAG size: 24 [2021-05-02 15:12:43,807 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:43,809 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:43,852 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:12:43,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:01,521 WARN L205 SmtUtils]: Spent 13.49 s on a formula simplification that was a NOOP. DAG size: 33 [2021-05-02 15:13:20,657 WARN L205 SmtUtils]: Spent 14.53 s on a formula simplification that was a NOOP. DAG size: 36 [2021-05-02 15:13:20,671 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:20,674 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:13:23,109 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 17 proven. 29 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-05-02 15:13:23,109 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:13:23,109 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1885994914] [2021-05-02 15:13:23,109 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:13:23,109 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [736119989] [2021-05-02 15:13:23,109 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [736119989] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:13:23,109 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:13:23,110 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-02 15:13:23,110 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747778591] [2021-05-02 15:13:23,110 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 15:13:23,110 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:13:23,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 15:13:23,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=171, Unknown=6, NotChecked=0, Total=210 [2021-05-02 15:13:23,110 INFO L87 Difference]: Start difference. First operand 357 states and 478 transitions. Second operand has 15 states, 15 states have (on average 2.4) internal successors, (36), 12 states have internal predecessors, (36), 7 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-05-02 15:14:32,530 WARN L205 SmtUtils]: Spent 8.08 s on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 15:14:57,163 WARN L205 SmtUtils]: Spent 4.28 s on a formula simplification that was a NOOP. DAG size: 41 [2021-05-02 15:15:55,173 WARN L205 SmtUtils]: Spent 18.12 s on a formula simplification that was a NOOP. DAG size: 42 [2021-05-02 15:16:30,064 WARN L205 SmtUtils]: Spent 7.20 s on a formula simplification that was a NOOP. DAG size: 39