/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/divbin2_valuebound20.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 14:35:54,526 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 14:35:54,528 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 14:35:54,553 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 14:35:54,562 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 14:35:54,563 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 14:35:54,564 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 14:35:54,565 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 14:35:54,566 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 14:35:54,567 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 14:35:54,568 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 14:35:54,570 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 14:35:54,571 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 14:35:54,572 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 14:35:54,573 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 14:35:54,574 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 14:35:54,576 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 14:35:54,583 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 14:35:54,584 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 14:35:54,593 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 14:35:54,594 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 14:35:54,614 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 14:35:54,615 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 14:35:54,616 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 14:35:54,616 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 14:35:54,616 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 14:35:54,617 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 14:35:54,617 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 14:35:54,617 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 14:35:54,617 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 14:35:54,617 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 14:35:54,618 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 14:35:54,618 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 14:35:54,618 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 14:35:54,618 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 14:35:54,618 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 14:35:54,619 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 14:35:54,619 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 14:35:54,619 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 14:35:54,619 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 14:35:54,619 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 14:35:54,619 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 14:35:54,620 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 14:35:54,620 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 14:35:54,620 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 14:35:54,620 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 14:35:54,621 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 14:35:54,623 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 14:35:54,623 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 14:35:54,623 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 14:35:54,909 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 14:35:54,926 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 14:35:54,928 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 14:35:54,929 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 14:35:54,929 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 14:35:54,930 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/divbin2_valuebound20.i [2021-05-02 14:35:54,983 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cc31a6b23/d33d71290d124d169128dbfd32ba9251/FLAGff628ec7b [2021-05-02 14:35:55,428 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 14:35:55,428 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/divbin2_valuebound20.i [2021-05-02 14:35:55,433 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cc31a6b23/d33d71290d124d169128dbfd32ba9251/FLAGff628ec7b [2021-05-02 14:35:55,444 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cc31a6b23/d33d71290d124d169128dbfd32ba9251 [2021-05-02 14:35:55,446 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 14:35:55,448 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 14:35:55,458 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 14:35:55,458 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 14:35:55,461 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 14:35:55,462 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 02:35:55" (1/1) ... [2021-05-02 14:35:55,463 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@54495fd6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:35:55, skipping insertion in model container [2021-05-02 14:35:55,463 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 02:35:55" (1/1) ... [2021-05-02 14:35:55,469 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 14:35:55,487 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 14:35:55,630 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/divbin2_valuebound20.i[959,972] [2021-05-02 14:35:55,653 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 14:35:55,661 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 14:35:55,717 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/divbin2_valuebound20.i[959,972] [2021-05-02 14:35:55,731 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 14:35:55,745 INFO L208 MainTranslator]: Completed translation [2021-05-02 14:35:55,745 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:35:55 WrapperNode [2021-05-02 14:35:55,745 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 14:35:55,746 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 14:35:55,747 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 14:35:55,748 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 14:35:55,756 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:35:55" (1/1) ... [2021-05-02 14:35:55,757 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:35:55" (1/1) ... [2021-05-02 14:35:55,763 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:35:55" (1/1) ... [2021-05-02 14:35:55,763 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:35:55" (1/1) ... [2021-05-02 14:35:55,779 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:35:55" (1/1) ... [2021-05-02 14:35:55,782 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:35:55" (1/1) ... [2021-05-02 14:35:55,788 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:35:55" (1/1) ... [2021-05-02 14:35:55,790 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 14:35:55,791 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 14:35:55,791 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 14:35:55,791 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 14:35:55,792 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:35:55" (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 14:35:55,863 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 14:35:55,863 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 14:35:55,864 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 14:35:55,864 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 14:35:55,864 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 14:35:55,864 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 14:35:55,865 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 14:35:55,865 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 14:35:55,866 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 14:35:55,866 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 14:35:55,866 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 14:35:55,866 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 14:35:55,867 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-02 14:35:55,867 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 14:35:55,867 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 14:35:55,867 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 14:35:55,867 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 14:35:55,867 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 14:35:55,868 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 14:35:55,868 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 14:35:55,868 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 14:35:55,868 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 14:35:56,118 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 14:35:56,118 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 14:35:56,119 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 02:35:56 BoogieIcfgContainer [2021-05-02 14:35:56,119 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 14:35:56,125 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 14:35:56,125 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 14:35:56,128 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 14:35:56,128 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 02:35:55" (1/3) ... [2021-05-02 14:35:56,128 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f036229 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 02:35:56, skipping insertion in model container [2021-05-02 14:35:56,129 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:35:55" (2/3) ... [2021-05-02 14:35:56,129 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f036229 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 02:35:56, skipping insertion in model container [2021-05-02 14:35:56,129 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 02:35:56" (3/3) ... [2021-05-02 14:35:56,130 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin2_valuebound20.i [2021-05-02 14:35:56,134 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 14:35:56,145 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 14:35:56,162 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 14:35:56,181 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 14:35:56,181 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 14:35:56,182 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 14:35:56,182 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 14:35:56,182 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 14:35:56,182 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 14:35:56,182 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 14:35:56,182 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 14:35:56,195 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 14:35:56,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 14:35:56,199 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:35:56,199 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:35:56,199 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:35:56,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:35:56,204 INFO L82 PathProgramCache]: Analyzing trace with hash 1171333446, now seen corresponding path program 1 times [2021-05-02 14:35:56,211 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:35:56,211 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1740488403] [2021-05-02 14:35:56,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:35:56,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:35:56,353 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 14:35:56,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:35:56,371 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 14:35:56,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:35:56,397 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:35:56,397 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:35:56,397 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1740488403] [2021-05-02 14:35:56,398 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1740488403] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:35:56,398 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:35:56,398 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 14:35:56,399 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542349856] [2021-05-02 14:35:56,402 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 14:35:56,403 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:35:56,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 14:35:56,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:35:56,414 INFO L87 Difference]: Start difference. First operand has 30 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) 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, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 14:35:56,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:35:56,504 INFO L93 Difference]: Finished difference Result 51 states and 70 transitions. [2021-05-02 14:35:56,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 14:35:56,506 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, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-05-02 14:35:56,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:35:56,511 INFO L225 Difference]: With dead ends: 51 [2021-05-02 14:35:56,512 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 14:35:56,514 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 30.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:35:56,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 14:35:56,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-05-02 14:35:56,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:35:56,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-05-02 14:35:56,553 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 18 [2021-05-02 14:35:56,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:35:56,554 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-05-02 14:35:56,554 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, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 14:35:56,554 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-05-02 14:35:56,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 14:35:56,555 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:35:56,556 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:35:56,556 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 14:35:56,556 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:35:56,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:35:56,557 INFO L82 PathProgramCache]: Analyzing trace with hash -73515422, now seen corresponding path program 1 times [2021-05-02 14:35:56,558 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:35:56,558 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [883938306] [2021-05-02 14:35:56,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:35:56,588 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:35:56,589 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1751826044] [2021-05-02 14:35:56,589 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 14:35:56,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:35:56,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 14:35:56,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:35:56,918 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:56,925 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:56,967 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:35:56,968 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:35:56,968 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [883938306] [2021-05-02 14:35:56,968 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:35:56,968 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1751826044] [2021-05-02 14:35:56,969 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1751826044] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:35:56,970 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:35:56,970 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-02 14:35:56,970 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153761557] [2021-05-02 14:35:56,971 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 14:35:56,971 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:35:56,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 14:35:56,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-02 14:35:56,973 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 14:35:57,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:35:57,078 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2021-05-02 14:35:57,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 14:35:57,079 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2021-05-02 14:35:57,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:35:57,080 INFO L225 Difference]: With dead ends: 37 [2021-05-02 14:35:57,080 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 14:35:57,081 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 104.4ms TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 14:35:57,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 14:35:57,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 14:35:57,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 24 states have internal predecessors, (28), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 14:35:57,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2021-05-02 14:35:57,088 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 19 [2021-05-02 14:35:57,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:35:57,088 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2021-05-02 14:35:57,089 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 14:35:57,089 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2021-05-02 14:35:57,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 14:35:57,089 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:35:57,089 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:35:57,311 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 14:35:57,311 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:35:57,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:35:57,312 INFO L82 PathProgramCache]: Analyzing trace with hash -1211706883, now seen corresponding path program 1 times [2021-05-02 14:35:57,312 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:35:57,313 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1542403261] [2021-05-02 14:35:57,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:35:57,324 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:35:57,325 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1886713091] [2021-05-02 14:35:57,325 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 14:35:57,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:35:57,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 14:35:57,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:35:57,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:57,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:57,585 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:35:57,586 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:35:57,586 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1542403261] [2021-05-02 14:35:57,586 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:35:57,586 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1886713091] [2021-05-02 14:35:57,586 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1886713091] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:35:57,586 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:35:57,587 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 14:35:57,587 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981819222] [2021-05-02 14:35:57,588 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 14:35:57,588 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:35:57,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 14:35:57,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 14:35:57,591 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 14:35:57,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:35:57,740 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2021-05-02 14:35:57,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 14:35:57,741 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 21 [2021-05-02 14:35:57,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:35:57,742 INFO L225 Difference]: With dead ends: 45 [2021-05-02 14:35:57,742 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 14:35:57,742 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 83.8ms TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-02 14:35:57,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 14:35:57,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-05-02 14:35:57,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 29 states have (on average 1.206896551724138) internal successors, (35), 30 states have internal predecessors, (35), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 14:35:57,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2021-05-02 14:35:57,750 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 21 [2021-05-02 14:35:57,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:35:57,750 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2021-05-02 14:35:57,750 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 14:35:57,750 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2021-05-02 14:35:57,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 14:35:57,751 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:35:57,751 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, 1] [2021-05-02 14:35:57,974 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:35:57,975 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:35:57,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:35:57,975 INFO L82 PathProgramCache]: Analyzing trace with hash 947727214, now seen corresponding path program 1 times [2021-05-02 14:35:57,975 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:35:57,975 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1720227645] [2021-05-02 14:35:57,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:35:57,985 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:35:57,986 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [97955017] [2021-05-02 14:35:57,986 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 14:35:58,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:35:58,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 14:35:58,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:35:58,137 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:35:58,137 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:35:58,137 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1720227645] [2021-05-02 14:35:58,137 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:35:58,137 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [97955017] [2021-05-02 14:35:58,138 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [97955017] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:35:58,138 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:35:58,138 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 14:35:58,138 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051023511] [2021-05-02 14:35:58,138 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 14:35:58,138 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:35:58,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 14:35:58,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:35:58,139 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:35:58,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:35:58,155 INFO L93 Difference]: Finished difference Result 53 states and 60 transitions. [2021-05-02 14:35:58,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 14:35:58,156 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 27 [2021-05-02 14:35:58,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:35:58,157 INFO L225 Difference]: With dead ends: 53 [2021-05-02 14:35:58,157 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 14:35:58,157 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.8ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:35:58,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 14:35:58,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-02 14:35:58,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 25 states have internal predecessors, (29), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 14:35:58,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2021-05-02 14:35:58,163 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 27 [2021-05-02 14:35:58,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:35:58,163 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2021-05-02 14:35:58,164 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:35:58,164 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2021-05-02 14:35:58,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 14:35:58,164 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:35:58,164 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:35:58,386 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:35:58,386 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:35:58,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:35:58,387 INFO L82 PathProgramCache]: Analyzing trace with hash 1574040585, now seen corresponding path program 1 times [2021-05-02 14:35:58,387 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:35:58,387 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1923528768] [2021-05-02 14:35:58,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:35:58,398 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:35:58,399 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [876093884] [2021-05-02 14:35:58,399 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 14:35:58,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:35:58,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 14:35:58,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:35:58,556 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:58,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:58,611 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:58,613 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:58,647 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:35:58,647 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:35:58,647 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1923528768] [2021-05-02 14:35:58,647 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:35:58,647 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [876093884] [2021-05-02 14:35:58,648 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [876093884] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:35:58,648 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:35:58,648 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 14:35:58,648 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091869981] [2021-05-02 14:35:58,648 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 14:35:58,648 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:35:58,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 14:35:58,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:35:58,649 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 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 14:35:58,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:35:58,841 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2021-05-02 14:35:58,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 14:35:58,848 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 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 14:35:58,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:35:58,849 INFO L225 Difference]: With dead ends: 58 [2021-05-02 14:35:58,849 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 14:35:58,849 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 88.7ms TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-05-02 14:35:58,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 14:35:58,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2021-05-02 14:35:58,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 40 states have internal predecessors, (45), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 14:35:58,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 61 transitions. [2021-05-02 14:35:58,867 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 61 transitions. Word has length 29 [2021-05-02 14:35:58,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:35:58,868 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 61 transitions. [2021-05-02 14:35:58,868 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 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 14:35:58,868 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 61 transitions. [2021-05-02 14:35:58,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 14:35:58,869 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:35:58,870 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:35:59,091 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:35:59,092 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:35:59,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:35:59,093 INFO L82 PathProgramCache]: Analyzing trace with hash -2129198620, now seen corresponding path program 2 times [2021-05-02 14:35:59,093 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:35:59,093 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [5074512] [2021-05-02 14:35:59,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:35:59,104 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:35:59,104 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [958725999] [2021-05-02 14:35:59,105 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:35:59,182 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:35:59,182 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:35:59,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-02 14:35:59,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:35:59,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:59,195 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:59,288 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:59,290 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:59,386 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:59,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:59,420 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:35:59,421 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:35:59,421 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [5074512] [2021-05-02 14:35:59,421 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:35:59,421 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [958725999] [2021-05-02 14:35:59,421 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [958725999] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:35:59,421 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:35:59,421 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 14:35:59,422 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305931257] [2021-05-02 14:35:59,422 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 14:35:59,422 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:35:59,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 14:35:59,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2021-05-02 14:35:59,423 INFO L87 Difference]: Start difference. First operand 54 states and 61 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 11 states have internal predecessors, (23), 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 14:35:59,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:35:59,678 INFO L93 Difference]: Finished difference Result 85 states and 100 transitions. [2021-05-02 14:35:59,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 14:35:59,679 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 11 states have internal predecessors, (23), 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 31 [2021-05-02 14:35:59,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:35:59,681 INFO L225 Difference]: With dead ends: 85 [2021-05-02 14:35:59,681 INFO L226 Difference]: Without dead ends: 82 [2021-05-02 14:35:59,681 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 151.1ms TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-02 14:35:59,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-02 14:35:59,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 54. [2021-05-02 14:35:59,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 39 states have (on average 1.205128205128205) internal successors, (47), 40 states have internal predecessors, (47), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:35:59,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 61 transitions. [2021-05-02 14:35:59,690 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 61 transitions. Word has length 31 [2021-05-02 14:35:59,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:35:59,691 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 61 transitions. [2021-05-02 14:35:59,691 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 11 states have internal predecessors, (23), 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 14:35:59,691 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 61 transitions. [2021-05-02 14:35:59,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 14:35:59,692 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:35:59,692 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 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 14:35:59,915 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 14:35:59,916 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:35:59,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:35:59,916 INFO L82 PathProgramCache]: Analyzing trace with hash -414186241, now seen corresponding path program 3 times [2021-05-02 14:35:59,916 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:35:59,916 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1216313188] [2021-05-02 14:35:59,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:35:59,930 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:35:59,930 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1853140622] [2021-05-02 14:35:59,930 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:36:00,020 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 14:36:00,020 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:36:00,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 14:36:00,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:36:00,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:00,027 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:00,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:00,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:00,108 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:00,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:00,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:00,160 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:00,192 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 14:36:00,192 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:36:00,192 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1216313188] [2021-05-02 14:36:00,193 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:36:00,193 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1853140622] [2021-05-02 14:36:00,193 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1853140622] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:36:00,193 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:36:00,193 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 14:36:00,193 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [475910621] [2021-05-02 14:36:00,193 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 14:36:00,194 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:36:00,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 14:36:00,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 14:36:00,194 INFO L87 Difference]: Start difference. First operand 54 states and 61 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:36:00,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:36:00,330 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2021-05-02 14:36:00,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 14:36:00,330 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 33 [2021-05-02 14:36:00,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:36:00,332 INFO L225 Difference]: With dead ends: 64 [2021-05-02 14:36:00,332 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 14:36:00,333 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 99.1ms TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-02 14:36:00,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 14:36:00,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 42. [2021-05-02 14:36:00,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 30 states have internal predecessors, (34), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 14:36:00,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 46 transitions. [2021-05-02 14:36:00,355 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 46 transitions. Word has length 33 [2021-05-02 14:36:00,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:36:00,355 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 46 transitions. [2021-05-02 14:36:00,356 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:36:00,356 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 46 transitions. [2021-05-02 14:36:00,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 14:36:00,356 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:36:00,357 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 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 14:36:00,565 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:36:00,566 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:36:00,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:36:00,566 INFO L82 PathProgramCache]: Analyzing trace with hash -758101483, now seen corresponding path program 4 times [2021-05-02 14:36:00,567 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:36:00,567 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1444031133] [2021-05-02 14:36:00,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:36:00,575 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:36:00,575 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1403627652] [2021-05-02 14:36:00,575 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:36:00,653 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 14:36:00,653 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:36:00,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 14:36:00,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:36:00,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:00,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:00,764 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:00,769 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:00,776 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:00,782 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:00,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:00,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:01,000 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 9 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 14:36:01,000 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:36:01,000 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1444031133] [2021-05-02 14:36:01,000 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:36:01,000 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1403627652] [2021-05-02 14:36:01,000 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1403627652] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:36:01,001 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:36:01,001 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 14:36:01,001 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103403458] [2021-05-02 14:36:01,002 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 14:36:01,002 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:36:01,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 14:36:01,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:36:01,003 INFO L87 Difference]: Start difference. First operand 42 states and 46 transitions. Second operand has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:36:01,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:36:01,155 INFO L93 Difference]: Finished difference Result 77 states and 88 transitions. [2021-05-02 14:36:01,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 14:36:01,156 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 37 [2021-05-02 14:36:01,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:36:01,156 INFO L225 Difference]: With dead ends: 77 [2021-05-02 14:36:01,157 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 14:36:01,157 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 233.3ms TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-02 14:36:01,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 14:36:01,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-05-02 14:36:01,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 32 states have internal predecessors, (36), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 14:36:01,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2021-05-02 14:36:01,162 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 37 [2021-05-02 14:36:01,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:36:01,162 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2021-05-02 14:36:01,162 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:36:01,162 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2021-05-02 14:36:01,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 14:36:01,163 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:36:01,163 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:36:01,363 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:36:01,364 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:36:01,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:36:01,364 INFO L82 PathProgramCache]: Analyzing trace with hash 826494192, now seen corresponding path program 5 times [2021-05-02 14:36:01,364 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:36:01,364 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2091202979] [2021-05-02 14:36:01,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:36:01,379 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:36:01,379 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1257989389] [2021-05-02 14:36:01,379 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:36:01,575 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-02 14:36:01,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:36:01,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 48 conjunts are in the unsatisfiable core [2021-05-02 14:36:01,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:36:01,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:01,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:01,890 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:01,893 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:01,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:01,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:02,001 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 3 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 14:36:02,001 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:36:02,001 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2091202979] [2021-05-02 14:36:02,001 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:36:02,001 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1257989389] [2021-05-02 14:36:02,002 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1257989389] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:36:02,002 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:36:02,002 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2021-05-02 14:36:02,002 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369888835] [2021-05-02 14:36:02,002 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 14:36:02,002 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:36:02,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 14:36:02,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2021-05-02 14:36:02,003 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand has 17 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 15 states have internal predecessors, (29), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:36:02,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:36:02,353 INFO L93 Difference]: Finished difference Result 107 states and 124 transitions. [2021-05-02 14:36:02,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 14:36:02,354 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 15 states have internal predecessors, (29), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 39 [2021-05-02 14:36:02,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:36:02,355 INFO L225 Difference]: With dead ends: 107 [2021-05-02 14:36:02,355 INFO L226 Difference]: Without dead ends: 76 [2021-05-02 14:36:02,356 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 290.1ms TimeCoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2021-05-02 14:36:02,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-02 14:36:02,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 66. [2021-05-02 14:36:02,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 48 states have (on average 1.1666666666666667) internal successors, (56), 49 states have internal predecessors, (56), 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 14:36:02,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 74 transitions. [2021-05-02 14:36:02,364 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 74 transitions. Word has length 39 [2021-05-02 14:36:02,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:36:02,365 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 74 transitions. [2021-05-02 14:36:02,365 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 15 states have internal predecessors, (29), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:36:02,365 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 74 transitions. [2021-05-02 14:36:02,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 14:36:02,366 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:36:02,366 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:36:02,570 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-05-02 14:36:02,570 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:36:02,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:36:02,570 INFO L82 PathProgramCache]: Analyzing trace with hash -1090452213, now seen corresponding path program 6 times [2021-05-02 14:36:02,570 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:36:02,571 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1267360108] [2021-05-02 14:36:02,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:36:02,583 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:36:02,584 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1461008081] [2021-05-02 14:36:02,584 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true