/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/ps3-ll_valuebound50.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 16:49:20,482 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 16:49:20,484 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 16:49:20,514 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 16:49:20,528 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 16:49:20,529 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 16:49:20,530 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 16:49:20,531 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 16:49:20,533 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 16:49:20,533 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 16:49:20,535 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 16:49:20,540 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 16:49:20,541 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 16:49:20,542 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 16:49:20,542 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 16:49:20,544 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 16:49:20,548 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 16:49:20,554 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 16:49:20,555 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 16:49:20,557 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 16:49:20,559 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 16:49:20,603 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 16:49:20,603 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 16:49:20,605 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 16:49:20,605 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 16:49:20,605 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 16:49:20,605 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 16:49:20,606 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 16:49:20,606 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 16:49:20,606 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 16:49:20,606 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 16:49:20,607 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 16:49:20,607 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 16:49:20,607 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 16:49:20,607 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 16:49:20,607 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 16:49:20,607 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 16:49:20,607 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 16:49:20,607 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 16:49:20,607 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 16:49:20,607 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 16:49:20,608 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 16:49:20,608 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 16:49:20,608 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 16:49:20,608 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 16:49:20,608 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 16:49:20,608 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 16:49:20,608 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 16:49:20,608 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 16:49:20,608 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 16:49:20,857 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 16:49:20,872 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 16:49:20,873 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 16:49:20,874 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 16:49:20,875 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 16:49:20,875 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/ps3-ll_valuebound50.c [2021-05-02 16:49:20,918 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/025dc141d/03591c49240e4c05b55ea137b741acb8/FLAGac72e3958 [2021-05-02 16:49:21,663 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 16:49:21,664 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps3-ll_valuebound50.c [2021-05-02 16:49:21,668 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/025dc141d/03591c49240e4c05b55ea137b741acb8/FLAGac72e3958 [2021-05-02 16:49:21,697 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/025dc141d/03591c49240e4c05b55ea137b741acb8 [2021-05-02 16:49:21,699 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 16:49:21,700 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 16:49:21,700 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 16:49:21,701 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 16:49:21,704 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 16:49:21,704 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 04:49:21" (1/1) ... [2021-05-02 16:49:21,705 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@315fe677 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:49:21, skipping insertion in model container [2021-05-02 16:49:21,705 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 04:49:21" (1/1) ... [2021-05-02 16:49:21,709 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 16:49:21,718 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 16:49:21,790 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/ps3-ll_valuebound50.c[458,471] [2021-05-02 16:49:21,798 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 16:49:21,803 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 16:49:21,810 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/ps3-ll_valuebound50.c[458,471] [2021-05-02 16:49:21,813 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 16:49:21,835 INFO L208 MainTranslator]: Completed translation [2021-05-02 16:49:21,835 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:49:21 WrapperNode [2021-05-02 16:49:21,835 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 16:49:21,843 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 16:49:21,843 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 16:49:21,843 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 16:49:21,860 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:49:21" (1/1) ... [2021-05-02 16:49:21,860 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:49:21" (1/1) ... [2021-05-02 16:49:21,864 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:49:21" (1/1) ... [2021-05-02 16:49:21,864 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:49:21" (1/1) ... [2021-05-02 16:49:21,866 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:49:21" (1/1) ... [2021-05-02 16:49:21,868 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:49:21" (1/1) ... [2021-05-02 16:49:21,869 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:49:21" (1/1) ... [2021-05-02 16:49:21,870 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 16:49:21,870 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 16:49:21,870 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 16:49:21,870 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 16:49:21,871 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:49:21" (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 16:49:21,933 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 16:49:21,934 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 16:49:21,934 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 16:49:21,934 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 16:49:21,934 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 16:49:21,934 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 16:49:21,934 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 16:49:21,934 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 16:49:21,935 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 16:49:21,935 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 16:49:21,935 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2021-05-02 16:49:21,935 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 16:49:21,936 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 16:49:21,936 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 16:49:21,937 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 16:49:21,938 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 16:49:21,938 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 16:49:21,938 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 16:49:21,938 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 16:49:21,938 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 16:49:22,119 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 16:49:22,120 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 16:49:22,120 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 04:49:22 BoogieIcfgContainer [2021-05-02 16:49:22,120 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 16:49:22,121 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 16:49:22,121 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 16:49:22,123 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 16:49:22,123 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 04:49:21" (1/3) ... [2021-05-02 16:49:22,124 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6da86ede and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 04:49:22, skipping insertion in model container [2021-05-02 16:49:22,124 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:49:21" (2/3) ... [2021-05-02 16:49:22,124 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6da86ede and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 04:49:22, skipping insertion in model container [2021-05-02 16:49:22,124 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 04:49:22" (3/3) ... [2021-05-02 16:49:22,125 INFO L111 eAbstractionObserver]: Analyzing ICFG ps3-ll_valuebound50.c [2021-05-02 16:49:22,128 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 16:49:22,147 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 16:49:22,157 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 16:49:22,191 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 16:49:22,191 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 16:49:22,191 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 16:49:22,191 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 16:49:22,191 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 16:49:22,191 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 16:49:22,191 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 16:49:22,191 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 16:49:22,213 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 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 16:49:22,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 16:49:22,215 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:49:22,216 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:49:22,216 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:49:22,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:49:22,219 INFO L82 PathProgramCache]: Analyzing trace with hash 1914087080, now seen corresponding path program 1 times [2021-05-02 16:49:22,239 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:49:22,239 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1237116720] [2021-05-02 16:49:22,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:49:22,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:49:22,405 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 16:49:22,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:49:22,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 16:49:22,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:49:22,428 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 16:49:22,428 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:49:22,428 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1237116720] [2021-05-02 16:49:22,429 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1237116720] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 16:49:22,429 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 16:49:22,429 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 16:49:22,430 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2079837555] [2021-05-02 16:49:22,432 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 16:49:22,433 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:49:22,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 16:49:22,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 16:49:22,443 INFO L87 Difference]: Start difference. First operand has 27 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 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 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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 16:49:22,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:49:22,505 INFO L93 Difference]: Finished difference Result 45 states and 56 transitions. [2021-05-02 16:49:22,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 16:49:22,506 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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 17 [2021-05-02 16:49:22,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:49:22,510 INFO L225 Difference]: With dead ends: 45 [2021-05-02 16:49:22,511 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 16:49:22,513 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 37.8ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 16:49:22,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 16:49:22,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-05-02 16:49:22,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 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 16:49:22,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-05-02 16:49:22,543 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 17 [2021-05-02 16:49:22,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:49:22,544 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-05-02 16:49:22,544 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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 16:49:22,545 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-05-02 16:49:22,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 16:49:22,545 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:49:22,545 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:49:22,546 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 16:49:22,546 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:49:22,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:49:22,547 INFO L82 PathProgramCache]: Analyzing trace with hash -1699034386, now seen corresponding path program 1 times [2021-05-02 16:49:22,547 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:49:22,548 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1213375761] [2021-05-02 16:49:22,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:49:22,571 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:49:22,571 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1043060172] [2021-05-02 16:49:22,571 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 16:49:22,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:49:22,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 16:49:22,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:49:22,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:49:22,775 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 16:49:22,775 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:49:22,776 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1213375761] [2021-05-02 16:49:22,776 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:49:22,776 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1043060172] [2021-05-02 16:49:22,776 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1043060172] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 16:49:22,776 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 16:49:22,777 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-02 16:49:22,777 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843399078] [2021-05-02 16:49:22,778 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 16:49:22,778 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:49:22,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 16:49:22,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 16:49:22,780 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 16:49:22,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:49:22,840 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2021-05-02 16:49:22,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 16:49:22,840 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2021-05-02 16:49:22,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:49:22,842 INFO L225 Difference]: With dead ends: 32 [2021-05-02 16:49:22,842 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 16:49:22,845 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 33.4ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-02 16:49:22,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 16:49:22,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-05-02 16:49:22,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 19 states have internal predecessors, (20), 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 16:49:22,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2021-05-02 16:49:22,858 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 17 [2021-05-02 16:49:22,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:49:22,858 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2021-05-02 16:49:22,860 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 16:49:22,860 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2021-05-02 16:49:22,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 16:49:22,860 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:49:22,860 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] [2021-05-02 16:49:23,076 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 16:49:23,076 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:49:23,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:49:23,080 INFO L82 PathProgramCache]: Analyzing trace with hash 276758134, now seen corresponding path program 1 times [2021-05-02 16:49:23,080 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:49:23,080 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1133211783] [2021-05-02 16:49:23,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:49:23,089 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:49:23,089 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2019041964] [2021-05-02 16:49:23,089 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 16:49:23,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:49:23,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 16:49:23,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:49:23,150 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:49:23,213 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 16:49:23,213 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:49:23,213 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1133211783] [2021-05-02 16:49:23,213 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:49:23,213 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2019041964] [2021-05-02 16:49:23,214 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2019041964] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:49:23,214 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:49:23,214 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 16:49:23,214 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1160961524] [2021-05-02 16:49:23,214 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 16:49:23,214 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:49:23,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 16:49:23,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 16:49:23,215 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 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 16:49:23,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:49:23,286 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2021-05-02 16:49:23,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 16:49:23,286 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 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 24 [2021-05-02 16:49:23,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:49:23,287 INFO L225 Difference]: With dead ends: 39 [2021-05-02 16:49:23,287 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 16:49:23,287 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 38.5ms TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-02 16:49:23,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 16:49:23,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-02 16:49:23,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 24 states have internal predecessors, (25), 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 16:49:23,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2021-05-02 16:49:23,291 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 24 [2021-05-02 16:49:23,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:49:23,292 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2021-05-02 16:49:23,292 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 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 16:49:23,292 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2021-05-02 16:49:23,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 16:49:23,292 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:49:23,292 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:49:23,506 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:49:23,507 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:49:23,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:49:23,507 INFO L82 PathProgramCache]: Analyzing trace with hash 1640710638, now seen corresponding path program 2 times [2021-05-02 16:49:23,507 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:49:23,507 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1636582850] [2021-05-02 16:49:23,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:49:23,517 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:49:23,517 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2109008261] [2021-05-02 16:49:23,517 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:49:23,591 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 16:49:23,592 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 16:49:23,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 16:49:23,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:49:23,708 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 16:49:23,709 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:49:23,709 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1636582850] [2021-05-02 16:49:23,709 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:49:23,709 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2109008261] [2021-05-02 16:49:23,709 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2109008261] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:49:23,709 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:49:23,709 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 16:49:23,710 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409777311] [2021-05-02 16:49:23,710 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 16:49:23,710 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:49:23,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 16:49:23,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 16:49:23,711 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 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 16:49:23,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:49:23,775 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2021-05-02 16:49:23,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 16:49:23,776 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 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 31 [2021-05-02 16:49:23,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:49:23,777 INFO L225 Difference]: With dead ends: 46 [2021-05-02 16:49:23,777 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 16:49:23,777 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 54.8ms TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-02 16:49:23,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 16:49:23,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-05-02 16:49:23,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 29 states have internal predecessors, (30), 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 16:49:23,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2021-05-02 16:49:23,782 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 31 [2021-05-02 16:49:23,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:49:23,782 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2021-05-02 16:49:23,783 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 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 16:49:23,783 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2021-05-02 16:49:23,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 16:49:23,783 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:49:23,783 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:49:23,999 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:49:23,999 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:49:24,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:49:24,000 INFO L82 PathProgramCache]: Analyzing trace with hash -481646730, now seen corresponding path program 3 times [2021-05-02 16:49:24,000 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:49:24,000 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1109362119] [2021-05-02 16:49:24,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:49:24,008 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:49:24,008 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1930815919] [2021-05-02 16:49:24,008 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 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