/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/divbin_unwindbound10.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 14:36:43,354 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 14:36:43,356 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 14:36:43,387 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 14:36:43,388 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 14:36:43,390 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 14:36:43,392 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 14:36:43,396 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 14:36:43,398 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 14:36:43,401 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 14:36:43,401 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 14:36:43,402 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 14:36:43,403 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 14:36:43,404 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 14:36:43,405 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 14:36:43,406 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 14:36:43,408 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 14:36:43,408 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 14:36:43,410 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 14:36:43,414 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 14:36:43,415 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 14:36:43,416 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 14:36:43,417 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 14:36:43,418 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 14:36:43,423 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-02 14:36:43,423 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-02 14:36:43,423 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-02 14:36:43,425 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-02 14:36:43,425 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-02 14:36:43,425 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-02 14:36:43,426 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-02 14:36:43,426 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-02 14:36:43,428 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-02 14:36:43,429 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-02 14:36:43,430 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-02 14:36:43,430 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-02 14:36:43,430 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-02 14:36:43,430 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-02 14:36:43,431 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 14:36:43,431 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 14:36:43,432 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 14:36:43,435 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 14:36:43,463 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 14:36:43,463 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 14:36:43,466 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 14:36:43,466 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 14:36:43,466 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 14:36:43,466 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 14:36:43,466 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 14:36:43,474 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 14:36:43,474 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 14:36:43,474 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 14:36:43,475 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 14:36:43,475 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 14:36:43,475 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 14:36:43,475 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 14:36:43,475 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 14:36:43,475 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 14:36:43,476 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 14:36:43,476 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 14:36:43,476 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 14:36:43,476 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 14:36:43,476 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 14:36:43,476 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 14:36:43,476 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 14:36:43,476 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 14:36:43,477 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 14:36:43,477 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 14:36:43,477 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 14:36:43,477 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 14:36:43,477 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 14:36:43,748 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 14:36:43,769 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 14:36:43,771 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 14:36:43,772 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 14:36:43,773 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 14:36:43,773 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/divbin_unwindbound10.i [2021-05-02 14:36:43,822 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d989426a6/02f69c9c4b5140e0bd027fe8264857b4/FLAG3ef4d6d9f [2021-05-02 14:36:44,199 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 14:36:44,199 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/divbin_unwindbound10.i [2021-05-02 14:36:44,203 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d989426a6/02f69c9c4b5140e0bd027fe8264857b4/FLAG3ef4d6d9f [2021-05-02 14:36:44,216 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d989426a6/02f69c9c4b5140e0bd027fe8264857b4 [2021-05-02 14:36:44,218 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 14:36:44,219 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 14:36:44,221 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 14:36:44,222 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 14:36:44,224 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 14:36:44,224 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 02:36:44" (1/1) ... [2021-05-02 14:36:44,225 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7a32beaf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:36:44, skipping insertion in model container [2021-05-02 14:36:44,225 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 02:36:44" (1/1) ... [2021-05-02 14:36:44,229 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 14:36:44,240 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 14:36:44,344 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/divbin_unwindbound10.i[958,971] [2021-05-02 14:36:44,372 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 14:36:44,379 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 14:36:44,415 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/divbin_unwindbound10.i[958,971] [2021-05-02 14:36:44,424 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 14:36:44,431 INFO L208 MainTranslator]: Completed translation [2021-05-02 14:36:44,432 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:36:44 WrapperNode [2021-05-02 14:36:44,432 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 14:36:44,433 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 14:36:44,433 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 14:36:44,434 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 14:36:44,440 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:36:44" (1/1) ... [2021-05-02 14:36:44,440 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:36:44" (1/1) ... [2021-05-02 14:36:44,444 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:36:44" (1/1) ... [2021-05-02 14:36:44,445 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:36:44" (1/1) ... [2021-05-02 14:36:44,453 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:36:44" (1/1) ... [2021-05-02 14:36:44,457 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:36:44" (1/1) ... [2021-05-02 14:36:44,460 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:36:44" (1/1) ... [2021-05-02 14:36:44,463 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 14:36:44,464 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 14:36:44,464 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 14:36:44,464 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 14:36:44,465 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:36:44" (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 14:36:44,515 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 14:36:44,515 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 14:36:44,516 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 14:36:44,516 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 14:36:44,516 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 14:36:44,516 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 14:36:44,516 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 14:36:44,516 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 14:36:44,517 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 14:36:44,517 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 14:36:44,517 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 14:36:44,517 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 14:36:44,518 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-02 14:36:44,518 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 14:36:44,519 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 14:36:44,519 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 14:36:44,519 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 14:36:44,519 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 14:36:44,519 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 14:36:44,519 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 14:36:44,519 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 14:36:44,519 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 14:36:44,755 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 14:36:44,755 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 14:36:44,756 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 02:36:44 BoogieIcfgContainer [2021-05-02 14:36:44,756 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 14:36:44,757 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 14:36:44,757 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 14:36:44,759 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 14:36:44,759 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 02:36:44" (1/3) ... [2021-05-02 14:36:44,759 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@76259cd8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 02:36:44, skipping insertion in model container [2021-05-02 14:36:44,759 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:36:44" (2/3) ... [2021-05-02 14:36:44,759 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@76259cd8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 02:36:44, skipping insertion in model container [2021-05-02 14:36:44,759 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 02:36:44" (3/3) ... [2021-05-02 14:36:44,760 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin_unwindbound10.i [2021-05-02 14:36:44,763 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 14:36:44,765 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 14:36:44,782 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 14:36:44,804 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 14:36:44,804 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 14:36:44,804 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 14:36:44,804 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 14:36:44,804 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 14:36:44,804 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 14:36:44,804 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 14:36:44,804 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 14:36:44,817 INFO L276 IsEmpty]: Start isEmpty. Operand has 33 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:36:44,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 14:36:44,821 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:36:44,821 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 14:36:44,821 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:36:44,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:36:44,824 INFO L82 PathProgramCache]: Analyzing trace with hash 878397729, now seen corresponding path program 1 times [2021-05-02 14:36:44,830 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:36:44,830 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [996469676] [2021-05-02 14:36:44,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:36:44,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:36:45,012 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 14:36:45,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:36:45,027 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 14:36:45,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:36:45,033 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 14:36:45,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:36:45,040 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 14:36:45,040 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:36:45,040 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [996469676] [2021-05-02 14:36:45,041 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [996469676] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:36:45,041 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:36:45,041 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 14:36:45,042 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178717913] [2021-05-02 14:36:45,044 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 14:36:45,045 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:36:45,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 14:36:45,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:36:45,053 INFO L87 Difference]: Start difference. First operand has 33 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 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 14:36:45,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:36:45,130 INFO L93 Difference]: Finished difference Result 60 states and 84 transitions. [2021-05-02 14:36:45,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 14:36:45,131 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 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 14:36:45,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:36:45,135 INFO L225 Difference]: With dead ends: 60 [2021-05-02 14:36:45,135 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 14:36:45,138 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 38.5ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:36:45,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 14:36:45,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2021-05-02 14:36:45,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 14:36:45,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2021-05-02 14:36:45,167 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 23 [2021-05-02 14:36:45,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:36:45,167 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2021-05-02 14:36:45,167 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 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 14:36:45,167 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2021-05-02 14:36:45,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 14:36:45,168 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:36:45,169 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, 1, 1] [2021-05-02 14:36:45,169 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 14:36:45,169 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:36:45,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:36:45,170 INFO L82 PathProgramCache]: Analyzing trace with hash 994169231, now seen corresponding path program 1 times [2021-05-02 14:36:45,170 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:36:45,170 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1681269650] [2021-05-02 14:36:45,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:36:45,201 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:36:45,201 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1483960343] [2021-05-02 14:36:45,201 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 14:36:45,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:36:45,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 14:36:45,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:36:45,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:45,359 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:45,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:45,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:45,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:45,456 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 14:36:45,456 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:36:45,456 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1681269650] [2021-05-02 14:36:45,457 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:36:45,457 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1483960343] [2021-05-02 14:36:45,457 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1483960343] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:36:45,457 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:36:45,457 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 14:36:45,457 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745504988] [2021-05-02 14:36:45,458 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 14:36:45,460 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:36:45,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 14:36:45,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 14:36:45,461 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 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 14:36:45,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:36:45,477 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2021-05-02 14:36:45,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 14:36:45,477 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 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 25 [2021-05-02 14:36:45,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:36:45,478 INFO L225 Difference]: With dead ends: 42 [2021-05-02 14:36:45,479 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 14:36:45,481 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.5ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 14:36:45,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 14:36:45,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-02 14:36:45,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 20 states have (on average 1.3) internal successors, (26), 21 states have internal predecessors, (26), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 14:36:45,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2021-05-02 14:36:45,494 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 25 [2021-05-02 14:36:45,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:36:45,495 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2021-05-02 14:36:45,497 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 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 14:36:45,497 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2021-05-02 14:36:45,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 14:36:45,498 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:36:45,498 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, 1, 1, 1] [2021-05-02 14:36:45,714 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 14:36:45,714 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:36:45,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:36:45,715 INFO L82 PathProgramCache]: Analyzing trace with hash 422434646, now seen corresponding path program 1 times [2021-05-02 14:36:45,715 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:36:45,715 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [30965925] [2021-05-02 14:36:45,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:36:45,726 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:36:45,727 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [766289961] [2021-05-02 14:36:45,727 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 14:36:45,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:36:45,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 14:36:45,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:36:45,811 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:45,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:45,816 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:45,838 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:45,841 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:45,842 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:45,852 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:45,853 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:45,864 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 14:36:45,864 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:36:45,864 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [30965925] [2021-05-02 14:36:45,864 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:36:45,864 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [766289961] [2021-05-02 14:36:45,864 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [766289961] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:36:45,864 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:36:45,864 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 14:36:45,865 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219715276] [2021-05-02 14:36:45,865 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 14:36:45,865 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:36:45,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 14:36:45,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:36:45,865 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 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 14:36:45,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:36:45,886 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2021-05-02 14:36:45,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 14:36:45,886 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 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 26 [2021-05-02 14:36:45,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:36:45,887 INFO L225 Difference]: With dead ends: 41 [2021-05-02 14:36:45,887 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 14:36:45,887 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 8.2ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:36:45,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 14:36:45,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2021-05-02 14:36:45,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 14:36:45,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 40 transitions. [2021-05-02 14:36:45,890 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 40 transitions. Word has length 26 [2021-05-02 14:36:45,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:36:45,891 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 40 transitions. [2021-05-02 14:36:45,891 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 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 14:36:45,891 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 40 transitions. [2021-05-02 14:36:45,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 14:36:45,891 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:36:45,891 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, 1, 1, 1] [2021-05-02 14:36:46,106 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:36:46,106 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:36:46,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:36:46,107 INFO L82 PathProgramCache]: Analyzing trace with hash 424222106, now seen corresponding path program 1 times [2021-05-02 14:36:46,107 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:36:46,107 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [559060593] [2021-05-02 14:36:46,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:36:46,115 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:36:46,116 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [53395364] [2021-05-02 14:36:46,116 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 14:36:46,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:36:46,157 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 14:36:46,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:36:46,191 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:46,199 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:46,308 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:46,312 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:46,334 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 14:36:46,334 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:36:46,334 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [559060593] [2021-05-02 14:36:46,335 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:36:46,335 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [53395364] [2021-05-02 14:36:46,335 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [53395364] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:36:46,335 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:36:46,335 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 14:36:46,335 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1942169011] [2021-05-02 14:36:46,335 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 14:36:46,335 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:36:46,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 14:36:46,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 14:36:46,336 INFO L87 Difference]: Start difference. First operand 33 states and 40 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 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 14:36:46,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:36:46,458 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2021-05-02 14:36:46,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 14:36:46,458 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 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 26 [2021-05-02 14:36:46,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:36:46,459 INFO L225 Difference]: With dead ends: 45 [2021-05-02 14:36:46,459 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 14:36:46,459 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 110.9ms TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-05-02 14:36:46,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 14:36:46,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2021-05-02 14:36:46,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 29 states have internal predecessors, (36), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 14:36:46,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2021-05-02 14:36:46,464 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 26 [2021-05-02 14:36:46,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:36:46,464 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2021-05-02 14:36:46,464 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 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 14:36:46,464 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2021-05-02 14:36:46,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 14:36:46,465 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:36:46,465 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] [2021-05-02 14:36:46,684 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:36:46,687 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:36:46,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:36:46,687 INFO L82 PathProgramCache]: Analyzing trace with hash -193375877, now seen corresponding path program 1 times [2021-05-02 14:36:46,687 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:36:46,687 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1181269217] [2021-05-02 14:36:46,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:36:46,696 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:36:46,696 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [855969864] [2021-05-02 14:36:46,696 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 14:36:46,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:36:46,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 14:36:46,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:36:46,740 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:46,742 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:46,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:46,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:46,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:46,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:46,769 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:46,770 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:46,780 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:36:46,780 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:36:46,780 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1181269217] [2021-05-02 14:36:46,780 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:36:46,781 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [855969864] [2021-05-02 14:36:46,781 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [855969864] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:36:46,781 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:36:46,781 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 14:36:46,781 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2106369685] [2021-05-02 14:36:46,781 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 14:36:46,781 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:36:46,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 14:36:46,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:36:46,782 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 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 14:36:46,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:36:46,804 INFO L93 Difference]: Finished difference Result 55 states and 67 transitions. [2021-05-02 14:36:46,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 14:36:46,804 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 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 28 [2021-05-02 14:36:46,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:36:46,805 INFO L225 Difference]: With dead ends: 55 [2021-05-02 14:36:46,805 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 14:36:46,805 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 10.6ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:36:46,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 14:36:46,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2021-05-02 14:36:46,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 31 states have internal predecessors, (38), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 14:36:46,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2021-05-02 14:36:46,809 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 28 [2021-05-02 14:36:46,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:36:46,809 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2021-05-02 14:36:46,809 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 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 14:36:46,809 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2021-05-02 14:36:46,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 14:36:46,810 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:36:46,810 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] [2021-05-02 14:36:47,025 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:36:47,025 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:36:47,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:36:47,025 INFO L82 PathProgramCache]: Analyzing trace with hash -2031725334, now seen corresponding path program 1 times [2021-05-02 14:36:47,025 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:36:47,026 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1984012454] [2021-05-02 14:36:47,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:36:47,039 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:36:47,039 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [469528452] [2021-05-02 14:36:47,039 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 14:36:47,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:36:47,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 14:36:47,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:36:47,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:47,098 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:47,099 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:47,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:47,121 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:47,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:47,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:47,149 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:47,151 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:47,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:47,164 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:47,173 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:36:47,173 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:36:47,173 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1984012454] [2021-05-02 14:36:47,173 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:36:47,173 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [469528452] [2021-05-02 14:36:47,174 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [469528452] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:36:47,174 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:36:47,174 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 14:36:47,174 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1257471240] [2021-05-02 14:36:47,174 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 14:36:47,174 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:36:47,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 14:36:47,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:36:47,174 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 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 14:36:47,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:36:47,205 INFO L93 Difference]: Finished difference Result 64 states and 74 transitions. [2021-05-02 14:36:47,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 14:36:47,206 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 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 29 [2021-05-02 14:36:47,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:36:47,206 INFO L225 Difference]: With dead ends: 64 [2021-05-02 14:36:47,206 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 14:36:47,207 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 14.5ms TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:36:47,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 14:36:47,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2021-05-02 14:36:47,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 40 states have (on average 1.25) internal successors, (50), 41 states have internal predecessors, (50), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:36:47,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 64 transitions. [2021-05-02 14:36:47,211 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 64 transitions. Word has length 29 [2021-05-02 14:36:47,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:36:47,212 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 64 transitions. [2021-05-02 14:36:47,212 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 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 14:36:47,212 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 64 transitions. [2021-05-02 14:36:47,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 14:36:47,212 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:36:47,212 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] [2021-05-02 14:36:47,433 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 14:36:47,433 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:36:47,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:36:47,433 INFO L82 PathProgramCache]: Analyzing trace with hash -2029937874, now seen corresponding path program 1 times [2021-05-02 14:36:47,434 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:36:47,434 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1308403576] [2021-05-02 14:36:47,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:36:47,441 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:36:47,441 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1176076330] [2021-05-02 14:36:47,441 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 14:36:47,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:36:47,509 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 14:36:47,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:36:47,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:47,549 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:47,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:47,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:47,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:47,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:47,652 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:36:47,652 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:36:47,652 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1308403576] [2021-05-02 14:36:47,652 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:36:47,653 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1176076330] [2021-05-02 14:36:47,653 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1176076330] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:36:47,653 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:36:47,653 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 14:36:47,653 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569517338] [2021-05-02 14:36:47,653 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 14:36:47,653 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:36:47,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 14:36:47,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:36:47,654 INFO L87 Difference]: Start difference. First operand 54 states and 64 transitions. Second operand has 10 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:36:47,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:36:47,807 INFO L93 Difference]: Finished difference Result 69 states and 82 transitions. [2021-05-02 14:36:47,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 14:36:47,808 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-05-02 14:36:47,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:36:47,809 INFO L225 Difference]: With dead ends: 69 [2021-05-02 14:36:47,809 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 14:36:47,809 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 109.5ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-02 14:36:47,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 14:36:47,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 53. [2021-05-02 14:36:47,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 40 states have internal predecessors, (48), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:36:47,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 62 transitions. [2021-05-02 14:36:47,814 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 62 transitions. Word has length 29 [2021-05-02 14:36:47,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:36:47,814 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 62 transitions. [2021-05-02 14:36:47,814 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:36:47,814 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 62 transitions. [2021-05-02 14:36:47,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 14:36:47,815 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:36:47,815 INFO L523 BasicCegarLoop]: trace histogram [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 14:36:48,033 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:36:48,033 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:36:48,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:36:48,033 INFO L82 PathProgramCache]: Analyzing trace with hash -1731935178, now seen corresponding path program 1 times [2021-05-02 14:36:48,034 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:36:48,034 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1805085700] [2021-05-02 14:36:48,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:36:48,040 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:36:48,040 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [73852045] [2021-05-02 14:36:48,040 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 14:36:48,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:36:48,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 14:36:48,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:36:48,127 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:36:48,127 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:36:48,127 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1805085700] [2021-05-02 14:36:48,127 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:36:48,127 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [73852045] [2021-05-02 14:36:48,127 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [73852045] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:36:48,127 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:36:48,128 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 14:36:48,128 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98224018] [2021-05-02 14:36:48,128 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 14:36:48,128 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:36:48,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 14:36:48,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:36:48,128 INFO L87 Difference]: Start difference. First operand 53 states and 62 transitions. Second operand has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 14:36:48,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:36:48,138 INFO L93 Difference]: Finished difference Result 74 states and 87 transitions. [2021-05-02 14:36:48,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 14:36:48,139 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 35 [2021-05-02 14:36:48,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:36:48,139 INFO L225 Difference]: With dead ends: 74 [2021-05-02 14:36:48,139 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 14:36:48,139 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:36:48,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 14:36:48,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-05-02 14:36:48,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 31 states have internal predecessors, (37), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 14:36:48,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2021-05-02 14:36:48,143 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 35 [2021-05-02 14:36:48,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:36:48,143 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2021-05-02 14:36:48,143 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 14:36:48,143 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2021-05-02 14:36:48,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 14:36:48,143 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:36:48,144 INFO L523 BasicCegarLoop]: trace histogram [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] [2021-05-02 14:36:48,361 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:36:48,361 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:36:48,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:36:48,362 INFO L82 PathProgramCache]: Analyzing trace with hash 815990494, now seen corresponding path program 1 times [2021-05-02 14:36:48,362 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:36:48,362 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1258050256] [2021-05-02 14:36:48,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:36:48,368 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:36:48,368 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2097894455] [2021-05-02 14:36:48,368 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 14:36:48,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:36:48,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 14:36:48,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:36:48,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:48,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:48,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:48,457 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:48,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:48,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:48,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:48,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:48,467 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:48,474 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:48,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:48,476 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:48,490 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:48,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:48,520 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:36:48,520 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:36:48,520 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1258050256] [2021-05-02 14:36:48,521 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:36:48,521 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2097894455] [2021-05-02 14:36:48,521 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2097894455] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:36:48,521 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:36:48,521 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 14:36:48,521 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682016213] [2021-05-02 14:36:48,521 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 14:36:48,521 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:36:48,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 14:36:48,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:36:48,522 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 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 14:36:48,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:36:48,553 INFO L93 Difference]: Finished difference Result 67 states and 78 transitions. [2021-05-02 14:36:48,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 14:36:48,553 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), 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 38 [2021-05-02 14:36:48,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:36:48,554 INFO L225 Difference]: With dead ends: 67 [2021-05-02 14:36:48,554 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 14:36:48,554 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 37.0ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:36:48,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 14:36:48,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2021-05-02 14:36:48,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 40 states have (on average 1.225) internal successors, (49), 41 states have internal predecessors, (49), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:36:48,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 63 transitions. [2021-05-02 14:36:48,557 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 63 transitions. Word has length 38 [2021-05-02 14:36:48,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:36:48,558 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 63 transitions. [2021-05-02 14:36:48,558 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), 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 14:36:48,558 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 63 transitions. [2021-05-02 14:36:48,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 14:36:48,558 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:36:48,558 INFO L523 BasicCegarLoop]: trace histogram [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] [2021-05-02 14:36:48,774 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-05-02 14:36:48,774 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:36:48,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:36:48,774 INFO L82 PathProgramCache]: Analyzing trace with hash 817777954, now seen corresponding path program 1 times [2021-05-02 14:36:48,774 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:36:48,774 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1517559144] [2021-05-02 14:36:48,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:36:48,799 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:36:48,799 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1702891151] [2021-05-02 14:36:48,799 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 14:36:48,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:36:48,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 14:36:48,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:36:48,936 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:48,939 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:49,003 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:49,007 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:49,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:49,075 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:49,093 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:49,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:49,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:49,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:49,736 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:36:49,736 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:36:49,736 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1517559144] [2021-05-02 14:36:49,736 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:36:49,737 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1702891151] [2021-05-02 14:36:49,737 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1702891151] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:36:49,737 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:36:49,737 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 14:36:49,737 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999765977] [2021-05-02 14:36:49,737 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 14:36:49,737 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:36:49,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 14:36:49,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2021-05-02 14:36:49,738 INFO L87 Difference]: Start difference. First operand 54 states and 63 transitions. Second operand has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:36:50,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:36:50,181 INFO L93 Difference]: Finished difference Result 79 states and 95 transitions. [2021-05-02 14:36:50,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 14:36:50,181 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 38 [2021-05-02 14:36:50,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:36:50,182 INFO L225 Difference]: With dead ends: 79 [2021-05-02 14:36:50,182 INFO L226 Difference]: Without dead ends: 76 [2021-05-02 14:36:50,182 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 418.0ms TimeCoverageRelationStatistics Valid=97, Invalid=409, Unknown=0, NotChecked=0, Total=506 [2021-05-02 14:36:50,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-02 14:36:50,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 63. [2021-05-02 14:36:50,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 46 states have (on average 1.1956521739130435) internal successors, (55), 48 states have internal predecessors, (55), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 14:36:50,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 73 transitions. [2021-05-02 14:36:50,187 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 73 transitions. Word has length 38 [2021-05-02 14:36:50,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:36:50,187 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 73 transitions. [2021-05-02 14:36:50,187 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:36:50,187 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 73 transitions. [2021-05-02 14:36:50,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 14:36:50,188 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:36:50,188 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] [2021-05-02 14:36:50,391 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:36:50,391 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:36:50,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:36:50,391 INFO L82 PathProgramCache]: Analyzing trace with hash 268409689, now seen corresponding path program 1 times [2021-05-02 14:36:50,391 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:36:50,391 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1552825093] [2021-05-02 14:36:50,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:36:50,413 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:36:50,413 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [297070165] [2021-05-02 14:36:50,413 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 14:36:50,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:36:50,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 14:36:50,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:36:50,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:50,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:50,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:50,494 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:50,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:50,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:50,502 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:50,504 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:50,505 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:50,523 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:50,524 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:50,542 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 14:36:50,542 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:36:50,542 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1552825093] [2021-05-02 14:36:50,542 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:36:50,542 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [297070165] [2021-05-02 14:36:50,542 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [297070165] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:36:50,542 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:36:50,542 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 14:36:50,542 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377962829] [2021-05-02 14:36:50,542 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 14:36:50,542 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:36:50,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 14:36:50,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:36:50,543 INFO L87 Difference]: Start difference. First operand 63 states and 73 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 3 states have call successors, (6), 3 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 14:36:50,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:36:50,574 INFO L93 Difference]: Finished difference Result 99 states and 116 transitions. [2021-05-02 14:36:50,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 14:36:50,574 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 3 states have call successors, (6), 3 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 40 [2021-05-02 14:36:50,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:36:50,576 INFO L225 Difference]: With dead ends: 99 [2021-05-02 14:36:50,576 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 14:36:50,577 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 18.5ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:36:50,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 14:36:50,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2021-05-02 14:36:50,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 48 states have (on average 1.1875) internal successors, (57), 50 states have internal predecessors, (57), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 14:36:50,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 75 transitions. [2021-05-02 14:36:50,584 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 75 transitions. Word has length 40 [2021-05-02 14:36:50,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:36:50,584 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 75 transitions. [2021-05-02 14:36:50,585 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 3 states have call successors, (6), 3 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 14:36:50,585 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 75 transitions. [2021-05-02 14:36:50,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 14:36:50,587 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:36:50,587 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] [2021-05-02 14:36:50,802 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:36:50,803 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:36:50,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:36:50,803 INFO L82 PathProgramCache]: Analyzing trace with hash 829605357, now seen corresponding path program 2 times [2021-05-02 14:36:50,803 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:36:50,803 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2038060558] [2021-05-02 14:36:50,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:36:50,822 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:36:50,822 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2014580257] [2021-05-02 14:36:50,822 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 14:36:50,860 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:36:50,860 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:36:50,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 14:36:50,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:36:50,871 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:50,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:50,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:50,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:50,890 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:50,891 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:50,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:50,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:50,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:50,908 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:50,909 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:50,909 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:50,917 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:50,918 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:50,946 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 14:36:50,946 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:36:50,946 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2038060558] [2021-05-02 14:36:50,946 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:36:50,946 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2014580257] [2021-05-02 14:36:50,947 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2014580257] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:36:50,947 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:36:50,947 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 14:36:50,947 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522972719] [2021-05-02 14:36:50,947 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 14:36:50,947 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:36:50,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 14:36:50,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:36:50,947 INFO L87 Difference]: Start difference. First operand 65 states and 75 transitions. Second operand has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 3 states have call successors, (6), 3 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 14:36:51,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:36:51,018 INFO L93 Difference]: Finished difference Result 106 states and 125 transitions. [2021-05-02 14:36:51,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 14:36:51,019 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 3 states have call successors, (6), 3 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 43 [2021-05-02 14:36:51,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:36:51,019 INFO L225 Difference]: With dead ends: 106 [2021-05-02 14:36:51,019 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 14:36:51,020 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 29.0ms TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:36:51,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 14:36:51,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 68. [2021-05-02 14:36:51,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 51 states have (on average 1.196078431372549) internal successors, (61), 53 states have internal predecessors, (61), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 14:36:51,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 79 transitions. [2021-05-02 14:36:51,023 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 79 transitions. Word has length 43 [2021-05-02 14:36:51,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:36:51,024 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 79 transitions. [2021-05-02 14:36:51,024 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 3 states have call successors, (6), 3 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 14:36:51,024 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 79 transitions. [2021-05-02 14:36:51,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 14:36:51,024 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:36:51,024 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 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 14:36:51,224 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 14:36:51,225 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:36:51,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:36:51,225 INFO L82 PathProgramCache]: Analyzing trace with hash -897932583, now seen corresponding path program 3 times [2021-05-02 14:36:51,225 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:36:51,225 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [824923092] [2021-05-02 14:36:51,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:36:51,231 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:36:51,231 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1012304347] [2021-05-02 14:36:51,231 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:36:51,268 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 14:36:51,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:36:51,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 14:36:51,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:36:51,308 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:51,309 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:51,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:51,316 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:51,334 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 14:36:51,334 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:36:51,334 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [824923092] [2021-05-02 14:36:51,334 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:36:51,334 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1012304347] [2021-05-02 14:36:51,334 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1012304347] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:36:51,335 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:36:51,335 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 14:36:51,335 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [997309203] [2021-05-02 14:36:51,335 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 14:36:51,335 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:36:51,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 14:36:51,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:36:51,335 INFO L87 Difference]: Start difference. First operand 68 states and 79 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 14:36:51,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:36:51,356 INFO L93 Difference]: Finished difference Result 97 states and 112 transitions. [2021-05-02 14:36:51,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 14:36:51,356 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 46 [2021-05-02 14:36:51,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:36:51,357 INFO L225 Difference]: With dead ends: 97 [2021-05-02 14:36:51,357 INFO L226 Difference]: Without dead ends: 63 [2021-05-02 14:36:51,357 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 11.4ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:36:51,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-02 14:36:51,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 48. [2021-05-02 14:36:51,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 34 states have (on average 1.1764705882352942) internal successors, (40), 35 states have internal predecessors, (40), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:36:51,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 54 transitions. [2021-05-02 14:36:51,360 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 54 transitions. Word has length 46 [2021-05-02 14:36:51,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:36:51,361 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 54 transitions. [2021-05-02 14:36:51,361 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 14:36:51,361 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 54 transitions. [2021-05-02 14:36:51,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 14:36:51,361 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:36:51,361 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 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] [2021-05-02 14:36:51,576 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 14:36:51,576 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:36:51,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:36:51,577 INFO L82 PathProgramCache]: Analyzing trace with hash 1469925226, now seen corresponding path program 2 times [2021-05-02 14:36:51,577 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:36:51,577 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [562235238] [2021-05-02 14:36:51,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:36:51,582 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:36:51,582 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1638041681] [2021-05-02 14:36:51,582 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 14:36:51,733 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:36:51,733 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:36:51,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 14:36:51,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:36:51,742 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:51,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:51,744 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:51,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:51,760 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:51,760 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:51,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:51,769 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:51,769 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:51,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:51,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:51,779 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:51,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:51,796 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:51,796 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:51,812 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:51,813 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:51,822 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:36:51,822 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:36:51,822 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [562235238] [2021-05-02 14:36:51,822 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:36:51,822 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1638041681] [2021-05-02 14:36:51,822 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1638041681] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:36:51,822 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:36:51,822 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 14:36:51,822 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1116570210] [2021-05-02 14:36:51,823 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 14:36:51,823 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:36:51,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 14:36:51,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:36:51,823 INFO L87 Difference]: Start difference. First operand 48 states and 54 transitions. Second operand has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 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 14:36:51,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:36:51,905 INFO L93 Difference]: Finished difference Result 98 states and 110 transitions. [2021-05-02 14:36:51,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 14:36:51,906 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 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 47 [2021-05-02 14:36:51,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:36:51,906 INFO L225 Difference]: With dead ends: 98 [2021-05-02 14:36:51,906 INFO L226 Difference]: Without dead ends: 91 [2021-05-02 14:36:51,906 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 32.8ms TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:36:51,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-05-02 14:36:51,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 71. [2021-05-02 14:36:51,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 53 states have (on average 1.169811320754717) internal successors, (62), 54 states have internal predecessors, (62), 10 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 14:36:51,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 80 transitions. [2021-05-02 14:36:51,910 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 80 transitions. Word has length 47 [2021-05-02 14:36:51,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:36:51,910 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 80 transitions. [2021-05-02 14:36:51,911 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 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 14:36:51,911 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 80 transitions. [2021-05-02 14:36:51,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 14:36:51,911 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:36:51,911 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 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] [2021-05-02 14:36:52,112 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 14:36:52,113 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:36:52,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:36:52,113 INFO L82 PathProgramCache]: Analyzing trace with hash 1471712686, now seen corresponding path program 2 times [2021-05-02 14:36:52,113 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:36:52,113 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [997524371] [2021-05-02 14:36:52,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:36:52,118 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:36:52,118 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1215029550] [2021-05-02 14:36:52,118 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:36:52,384 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:36:52,385 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:36:52,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 14:36:52,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:36:52,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:52,421 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:52,533 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:52,537 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:52,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:52,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:52,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:52,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:53,036 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:53,111 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 11 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 14:36:53,111 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:36:53,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [997524371] [2021-05-02 14:36:53,111 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:36:53,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1215029550] [2021-05-02 14:36:53,111 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1215029550] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:36:53,111 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:36:53,111 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 14:36:53,111 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371607741] [2021-05-02 14:36:53,112 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 14:36:53,112 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:36:53,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 14:36:53,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2021-05-02 14:36:53,113 INFO L87 Difference]: Start difference. First operand 71 states and 80 transitions. Second operand has 11 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 14:36:53,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:36:53,301 INFO L93 Difference]: Finished difference Result 100 states and 113 transitions. [2021-05-02 14:36:53,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 14:36:53,302 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 47 [2021-05-02 14:36:53,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:36:53,302 INFO L225 Difference]: With dead ends: 100 [2021-05-02 14:36:53,302 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 14:36:53,303 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 237.1ms TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-05-02 14:36:53,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 14:36:53,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-05-02 14:36:53,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 37 states have (on average 1.162162162162162) internal successors, (43), 38 states have internal predecessors, (43), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:36:53,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 57 transitions. [2021-05-02 14:36:53,305 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 57 transitions. Word has length 47 [2021-05-02 14:36:53,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:36:53,306 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 57 transitions. [2021-05-02 14:36:53,306 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 14:36:53,306 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 57 transitions. [2021-05-02 14:36:53,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 14:36:53,306 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:36:53,306 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 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] [2021-05-02 14:36:53,507 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:36:53,507 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:36:53,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:36:53,507 INFO L82 PathProgramCache]: Analyzing trace with hash 1045745238, now seen corresponding path program 3 times [2021-05-02 14:36:53,507 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:36:53,507 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [713377510] [2021-05-02 14:36:53,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:36:53,516 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:36:53,516 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [88675170] [2021-05-02 14:36:53,517 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:36:53,690 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 14:36:53,690 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:36:53,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 14:36:53,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:36:53,700 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:53,701 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:53,701 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:53,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:53,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:53,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:53,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:53,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:53,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:53,739 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:53,740 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:53,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:53,750 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:53,751 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:53,751 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:53,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:53,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:53,768 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:53,784 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:53,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:53,794 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:36:53,794 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:36:53,794 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [713377510] [2021-05-02 14:36:53,794 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:36:53,794 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [88675170] [2021-05-02 14:36:53,794 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [88675170] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:36:53,794 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:36:53,795 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 14:36:53,795 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585079610] [2021-05-02 14:36:53,795 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 14:36:53,795 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:36:53,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 14:36:53,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 14:36:53,796 INFO L87 Difference]: Start difference. First operand 51 states and 57 transitions. Second operand has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 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 14:36:53,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:36:53,845 INFO L93 Difference]: Finished difference Result 101 states and 113 transitions. [2021-05-02 14:36:53,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 14:36:53,846 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 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 50 [2021-05-02 14:36:53,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:36:53,847 INFO L225 Difference]: With dead ends: 101 [2021-05-02 14:36:53,848 INFO L226 Difference]: Without dead ends: 94 [2021-05-02 14:36:53,848 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 34.4ms TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-05-02 14:36:53,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-02 14:36:53,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 74. [2021-05-02 14:36:53,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 56 states have (on average 1.1607142857142858) internal successors, (65), 57 states have internal predecessors, (65), 10 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 14:36:53,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 83 transitions. [2021-05-02 14:36:53,853 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 83 transitions. Word has length 50 [2021-05-02 14:36:53,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:36:53,853 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 83 transitions. [2021-05-02 14:36:53,853 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 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 14:36:53,853 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 83 transitions. [2021-05-02 14:36:53,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 14:36:53,854 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:36:53,854 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:36:54,057 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 14:36:54,057 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:36:54,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:36:54,058 INFO L82 PathProgramCache]: Analyzing trace with hash 1047532698, now seen corresponding path program 3 times [2021-05-02 14:36:54,058 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:36:54,058 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1288199407] [2021-05-02 14:36:54,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:36:54,074 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:36:54,074 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [827891458] [2021-05-02 14:36:54,074 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 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