/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/sqrt1-ll_valuebound100.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 17:24:20,771 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 17:24:20,774 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 17:24:20,811 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 17:24:20,831 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 17:24:20,833 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 17:24:20,834 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 17:24:20,836 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 17:24:20,839 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 17:24:20,839 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 17:24:20,842 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 17:24:20,847 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 17:24:20,848 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 17:24:20,849 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 17:24:20,850 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 17:24:20,852 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 17:24:20,857 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 17:24:20,866 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 17:24:20,866 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 17:24:20,867 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 17:24:20,871 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 17:24:20,907 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 17:24:20,907 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 17:24:20,910 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 17:24:20,910 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 17:24:20,910 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 17:24:20,910 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 17:24:20,910 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 17:24:20,910 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 17:24:20,911 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 17:24:20,911 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 17:24:20,912 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 17:24:20,912 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 17:24:20,912 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 17:24:20,912 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 17:24:20,912 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 17:24:20,912 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 17:24:20,912 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 17:24:20,913 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 17:24:20,913 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 17:24:20,913 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 17:24:20,913 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:24:20,913 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 17:24:20,924 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 17:24:20,924 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 17:24:20,924 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 17:24:20,924 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 17:24:20,924 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 17:24:20,925 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 17:24:20,925 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 17:24:21,245 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 17:24:21,266 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 17:24:21,268 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 17:24:21,269 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 17:24:21,270 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 17:24:21,271 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_valuebound100.c [2021-05-02 17:24:21,330 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/132934064/3127b808a24d4434ae8f2d1e8e53dd43/FLAGc5a57ad1a [2021-05-02 17:24:21,738 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 17:24:21,738 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_valuebound100.c [2021-05-02 17:24:21,744 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/132934064/3127b808a24d4434ae8f2d1e8e53dd43/FLAGc5a57ad1a [2021-05-02 17:24:21,764 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/132934064/3127b808a24d4434ae8f2d1e8e53dd43 [2021-05-02 17:24:21,766 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 17:24:21,768 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 17:24:21,771 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 17:24:21,771 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 17:24:21,775 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 17:24:21,776 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:24:21" (1/1) ... [2021-05-02 17:24:21,777 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6457d252 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:24:21, skipping insertion in model container [2021-05-02 17:24:21,777 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:24:21" (1/1) ... [2021-05-02 17:24:21,783 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 17:24:21,797 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 17:24:21,939 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/sqrt1-ll_valuebound100.c[520,533] [2021-05-02 17:24:21,957 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:24:21,965 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 17:24:21,991 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/sqrt1-ll_valuebound100.c[520,533] [2021-05-02 17:24:21,996 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:24:22,037 INFO L208 MainTranslator]: Completed translation [2021-05-02 17:24:22,038 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:24:22 WrapperNode [2021-05-02 17:24:22,038 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 17:24:22,039 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 17:24:22,039 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 17:24:22,040 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 17:24:22,049 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:24:22" (1/1) ... [2021-05-02 17:24:22,049 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:24:22" (1/1) ... [2021-05-02 17:24:22,057 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:24:22" (1/1) ... [2021-05-02 17:24:22,057 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:24:22" (1/1) ... [2021-05-02 17:24:22,069 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:24:22" (1/1) ... [2021-05-02 17:24:22,073 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:24:22" (1/1) ... [2021-05-02 17:24:22,075 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:24:22" (1/1) ... [2021-05-02 17:24:22,080 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 17:24:22,082 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 17:24:22,082 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 17:24:22,082 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 17:24:22,083 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:24:22" (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 17:24:22,173 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 17:24:22,173 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 17:24:22,174 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 17:24:22,174 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 17:24:22,174 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 17:24:22,174 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 17:24:22,174 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 17:24:22,174 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 17:24:22,175 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 17:24:22,175 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 17:24:22,175 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 17:24:22,175 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 17:24:22,176 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 17:24:22,176 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 17:24:22,176 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 17:24:22,176 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 17:24:22,177 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 17:24:22,177 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 17:24:22,177 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 17:24:22,177 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 17:24:22,411 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 17:24:22,411 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 17:24:22,412 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:24:22 BoogieIcfgContainer [2021-05-02 17:24:22,413 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 17:24:22,414 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 17:24:22,414 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 17:24:22,432 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 17:24:22,433 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 05:24:21" (1/3) ... [2021-05-02 17:24:22,434 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@87b83d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:24:22, skipping insertion in model container [2021-05-02 17:24:22,434 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:24:22" (2/3) ... [2021-05-02 17:24:22,434 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@87b83d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:24:22, skipping insertion in model container [2021-05-02 17:24:22,434 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:24:22" (3/3) ... [2021-05-02 17:24:22,435 INFO L111 eAbstractionObserver]: Analyzing ICFG sqrt1-ll_valuebound100.c [2021-05-02 17:24:22,440 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 17:24:22,443 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 17:24:22,473 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 17:24:22,499 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 17:24:22,500 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 17:24:22,500 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 17:24:22,500 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 17:24:22,500 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 17:24:22,500 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 17:24:22,500 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 17:24:22,500 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 17:24:22,537 INFO L276 IsEmpty]: Start isEmpty. Operand has 31 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 17:24:22,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 17:24:22,541 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:24:22,542 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 17:24:22,542 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:24:22,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:24:22,546 INFO L82 PathProgramCache]: Analyzing trace with hash 326851384, now seen corresponding path program 1 times [2021-05-02 17:24:22,556 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:24:22,557 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [678725227] [2021-05-02 17:24:22,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:24:22,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:24:22,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:24:22,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:24:22,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 17:24:22,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:24:22,838 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 17:24:22,839 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:24:22,839 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [678725227] [2021-05-02 17:24:22,840 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [678725227] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:24:22,840 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:24:22,841 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 17:24:22,841 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842222785] [2021-05-02 17:24:22,844 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 17:24:22,846 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:24:22,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 17:24:22,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:24:22,858 INFO L87 Difference]: Start difference. First operand has 31 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) 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 17:24:23,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:24:23,008 INFO L93 Difference]: Finished difference Result 53 states and 76 transitions. [2021-05-02 17:24:23,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 17:24:23,011 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 17:24:23,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:24:23,017 INFO L225 Difference]: With dead ends: 53 [2021-05-02 17:24:23,017 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 17:24:23,021 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 68.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:24:23,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 17:24:23,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-05-02 17:24:23,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 17:24:23,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2021-05-02 17:24:23,065 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 17 [2021-05-02 17:24:23,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:24:23,066 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2021-05-02 17:24:23,066 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 17:24:23,066 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2021-05-02 17:24:23,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 17:24:23,069 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:24:23,069 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 17:24:23,069 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 17:24:23,069 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:24:23,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:24:23,070 INFO L82 PathProgramCache]: Analyzing trace with hash 1008578050, now seen corresponding path program 1 times [2021-05-02 17:24:23,070 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:24:23,071 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1739770618] [2021-05-02 17:24:23,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:24:23,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:24:23,243 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:24:23,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:24:23,257 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 17:24:23,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:24:23,263 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 17:24:23,263 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:24:23,263 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1739770618] [2021-05-02 17:24:23,263 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1739770618] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:24:23,263 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:24:23,263 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 17:24:23,264 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011308423] [2021-05-02 17:24:23,265 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 17:24:23,265 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:24:23,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 17:24:23,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:24:23,266 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 17:24:23,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:24:23,694 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2021-05-02 17:24:23,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:24:23,696 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2021-05-02 17:24:23,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:24:23,698 INFO L225 Difference]: With dead ends: 40 [2021-05-02 17:24:23,698 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 17:24:23,700 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 253.9ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:24:23,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 17:24:23,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2021-05-02 17:24:23,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 20 states have internal predecessors, (21), 13 states have call successors, (13), 5 states have call predecessors, (13), 4 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 17:24:23,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 45 transitions. [2021-05-02 17:24:23,713 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 45 transitions. Word has length 17 [2021-05-02 17:24:23,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:24:23,713 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 45 transitions. [2021-05-02 17:24:23,713 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 17:24:23,713 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 45 transitions. [2021-05-02 17:24:23,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 17:24:23,714 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:24:23,714 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, 1] [2021-05-02 17:24:23,714 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 17:24:23,714 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:24:23,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:24:23,715 INFO L82 PathProgramCache]: Analyzing trace with hash -789682422, now seen corresponding path program 1 times [2021-05-02 17:24:23,715 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:24:23,715 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1042443444] [2021-05-02 17:24:23,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:24:23,729 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:24:23,729 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [430030564] [2021-05-02 17:24:23,729 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 17:24:23,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:24:23,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 17:24:23,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:24:24,013 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:24:24,013 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:24:24,013 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1042443444] [2021-05-02 17:24:24,014 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:24:24,014 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [430030564] [2021-05-02 17:24:24,014 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [430030564] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:24:24,014 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:24:24,014 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 17:24:24,014 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719433847] [2021-05-02 17:24:24,014 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 17:24:24,015 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:24:24,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 17:24:24,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:24:24,015 INFO L87 Difference]: Start difference. First operand 36 states and 45 transitions. Second operand has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 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 17:24:24,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:24:24,238 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2021-05-02 17:24:24,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:24:24,239 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 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 22 [2021-05-02 17:24:24,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:24:24,241 INFO L225 Difference]: With dead ends: 44 [2021-05-02 17:24:24,241 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 17:24:24,243 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 129.3ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:24:24,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 17:24:24,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-05-02 17:24:24,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 22 states have internal predecessors, (23), 12 states have call successors, (12), 6 states have call predecessors, (12), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 17:24:24,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 45 transitions. [2021-05-02 17:24:24,262 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 45 transitions. Word has length 22 [2021-05-02 17:24:24,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:24:24,263 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 45 transitions. [2021-05-02 17:24:24,263 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 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 17:24:24,263 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 45 transitions. [2021-05-02 17:24:24,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 17:24:24,265 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:24:24,265 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 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 17:24:24,485 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 17:24:24,485 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:24:24,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:24:24,486 INFO L82 PathProgramCache]: Analyzing trace with hash -2092280728, now seen corresponding path program 1 times [2021-05-02 17:24:24,486 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:24:24,486 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [783719334] [2021-05-02 17:24:24,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:24:24,499 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:24:24,500 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [301318227] [2021-05-02 17:24:24,500 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 17:24:24,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:24:24,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 17:24:24,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:24:24,776 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 17:24:24,777 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:24:24,777 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [783719334] [2021-05-02 17:24:24,777 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:24:24,777 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [301318227] [2021-05-02 17:24:24,777 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [301318227] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:24:24,778 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:24:24,778 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 17:24:24,778 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [412479969] [2021-05-02 17:24:24,778 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 17:24:24,778 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:24:24,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 17:24:24,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:24:24,779 INFO L87 Difference]: Start difference. First operand 39 states and 45 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 17:24:24,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:24:24,901 INFO L93 Difference]: Finished difference Result 53 states and 64 transitions. [2021-05-02 17:24:24,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 17:24:24,901 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 34 [2021-05-02 17:24:24,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:24:24,904 INFO L225 Difference]: With dead ends: 53 [2021-05-02 17:24:24,904 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 17:24:24,904 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 44.6ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:24:24,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 17:24:24,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 49. [2021-05-02 17:24:24,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 28 states have internal predecessors, (29), 16 states have call successors, (16), 7 states have call predecessors, (16), 6 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 17:24:24,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 59 transitions. [2021-05-02 17:24:24,927 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 59 transitions. Word has length 34 [2021-05-02 17:24:24,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:24:24,927 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 59 transitions. [2021-05-02 17:24:24,927 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 17:24:24,927 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 59 transitions. [2021-05-02 17:24:24,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 17:24:24,928 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:24:24,928 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:24:25,144 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:24:25,145 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:24:25,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:24:25,146 INFO L82 PathProgramCache]: Analyzing trace with hash 398970980, now seen corresponding path program 2 times [2021-05-02 17:24:25,146 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:24:25,146 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1150111528] [2021-05-02 17:24:25,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:24:25,155 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:24:25,156 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1991144051] [2021-05-02 17:24:25,162 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 17:24:25,207 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:24:25,207 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:24:25,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 17:24:25,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:24:25,345 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 7 proven. 13 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 17:24:25,346 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:24:25,346 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1150111528] [2021-05-02 17:24:25,346 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:24:25,346 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1991144051] [2021-05-02 17:24:25,346 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1991144051] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:24:25,346 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:24:25,346 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 17:24:25,346 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496320564] [2021-05-02 17:24:25,347 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 17:24:25,347 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:24:25,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 17:24:25,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:24:25,348 INFO L87 Difference]: Start difference. First operand 49 states and 59 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-02 17:24:25,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:24:25,495 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2021-05-02 17:24:25,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:24:25,496 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 39 [2021-05-02 17:24:25,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:24:25,496 INFO L225 Difference]: With dead ends: 57 [2021-05-02 17:24:25,497 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 17:24:25,497 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 57.0ms TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:24:25,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 17:24:25,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2021-05-02 17:24:25,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 29 states have (on average 1.103448275862069) internal successors, (32), 31 states have internal predecessors, (32), 17 states have call successors, (17), 8 states have call predecessors, (17), 7 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-02 17:24:25,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 64 transitions. [2021-05-02 17:24:25,505 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 64 transitions. Word has length 39 [2021-05-02 17:24:25,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:24:25,505 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 64 transitions. [2021-05-02 17:24:25,506 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-02 17:24:25,506 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 64 transitions. [2021-05-02 17:24:25,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 17:24:25,507 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:24:25,507 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 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 17:24:25,732 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:24:25,733 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:24:25,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:24:25,733 INFO L82 PathProgramCache]: Analyzing trace with hash 1537313192, now seen corresponding path program 3 times [2021-05-02 17:24:25,734 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:24:25,734 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2032457149] [2021-05-02 17:24:25,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:24:25,742 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:24:25,742 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1317436735] [2021-05-02 17:24:25,742 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 [2021-05-02 17:24:25,787 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 17:24:25,788 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:24:25,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 17:24:25,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:24:25,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:24:25,921 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 17:24:25,921 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:24:25,921 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2032457149] [2021-05-02 17:24:25,921 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:24:25,921 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1317436735] [2021-05-02 17:24:25,921 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1317436735] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:24:25,921 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:24:25,921 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 17:24:25,922 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554979789] [2021-05-02 17:24:25,922 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 17:24:25,922 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:24:25,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 17:24:25,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:24:25,923 INFO L87 Difference]: Start difference. First operand 54 states and 64 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, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 17:24:26,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:24:26,013 INFO L93 Difference]: Finished difference Result 61 states and 70 transitions. [2021-05-02 17:24:26,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:24:26,013 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, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 44 [2021-05-02 17:24:26,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:24:26,014 INFO L225 Difference]: With dead ends: 61 [2021-05-02 17:24:26,014 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 17:24:26,015 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 45.0ms TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:24:26,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 17:24:26,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-05-02 17:24:26,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 32 states have (on average 1.0625) internal successors, (34), 33 states have internal predecessors, (34), 15 states have call successors, (15), 9 states have call predecessors, (15), 8 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 17:24:26,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 62 transitions. [2021-05-02 17:24:26,023 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 62 transitions. Word has length 44 [2021-05-02 17:24:26,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:24:26,024 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 62 transitions. [2021-05-02 17:24:26,024 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, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 17:24:26,024 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 62 transitions. [2021-05-02 17:24:26,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 17:24:26,025 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:24:26,025 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:24:26,248 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:24:26,248 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:24:26,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:24:26,249 INFO L82 PathProgramCache]: Analyzing trace with hash -463567166, now seen corresponding path program 4 times [2021-05-02 17:24:26,249 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:24:26,249 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2049240610] [2021-05-02 17:24:26,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:24:26,257 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:24:26,258 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [566319390] [2021-05-02 17:24:26,258 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 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 17:24:26,309 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:24:26,309 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:24:26,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 17:24:26,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:24:26,445 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 12 proven. 9 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-05-02 17:24:26,446 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:24:26,446 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2049240610] [2021-05-02 17:24:26,446 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:24:26,446 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [566319390] [2021-05-02 17:24:26,446 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [566319390] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:24:26,447 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:24:26,447 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 17:24:26,447 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1535483880] [2021-05-02 17:24:26,447 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 17:24:26,447 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:24:26,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 17:24:26,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:24:26,448 INFO L87 Difference]: Start difference. First operand 56 states and 62 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 4 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-02 17:24:26,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:24:26,538 INFO L93 Difference]: Finished difference Result 70 states and 81 transitions. [2021-05-02 17:24:26,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:24:26,539 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 4 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 51 [2021-05-02 17:24:26,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:24:26,542 INFO L225 Difference]: With dead ends: 70 [2021-05-02 17:24:26,542 INFO L226 Difference]: Without dead ends: 68 [2021-05-02 17:24:26,543 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 32.4ms TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:24:26,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-02 17:24:26,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2021-05-02 17:24:26,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 39 states have internal predecessors, (40), 19 states have call successors, (19), 10 states have call predecessors, (19), 9 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2021-05-02 17:24:26,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 76 transitions. [2021-05-02 17:24:26,563 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 76 transitions. Word has length 51 [2021-05-02 17:24:26,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:24:26,564 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 76 transitions. [2021-05-02 17:24:26,564 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 4 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-02 17:24:26,564 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 76 transitions. [2021-05-02 17:24:26,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 17:24:26,571 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:24:26,571 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:24:26,776 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 17:24:26,777 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:24:26,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:24:26,777 INFO L82 PathProgramCache]: Analyzing trace with hash 790038090, now seen corresponding path program 5 times [2021-05-02 17:24:26,778 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:24:26,778 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1085303715] [2021-05-02 17:24:26,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:24:26,784 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:24:26,784 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1991034782] [2021-05-02 17:24:26,784 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 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 17:24:26,855 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-02 17:24:26,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:24:26,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 17:24:26,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:24:27,022 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 13 proven. 30 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 17:24:27,023 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:24:27,023 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1085303715] [2021-05-02 17:24:27,023 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:24:27,023 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1991034782] [2021-05-02 17:24:27,023 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1991034782] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:24:27,023 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:24:27,023 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 17:24:27,023 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724596734] [2021-05-02 17:24:27,024 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 17:24:27,024 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:24:27,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 17:24:27,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:24:27,024 INFO L87 Difference]: Start difference. First operand 66 states and 76 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-02 17:24:27,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:24:27,205 INFO L93 Difference]: Finished difference Result 74 states and 84 transitions. [2021-05-02 17:24:27,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 17:24:27,206 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) Word has length 56 [2021-05-02 17:24:27,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:24:27,207 INFO L225 Difference]: With dead ends: 74 [2021-05-02 17:24:27,207 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 17:24:27,208 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 59.8ms TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:24:27,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 17:24:27,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2021-05-02 17:24:27,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 40 states have (on average 1.075) internal successors, (43), 42 states have internal predecessors, (43), 20 states have call successors, (20), 11 states have call predecessors, (20), 10 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-02 17:24:27,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 81 transitions. [2021-05-02 17:24:27,216 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 81 transitions. Word has length 56 [2021-05-02 17:24:27,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:24:27,217 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 81 transitions. [2021-05-02 17:24:27,217 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-02 17:24:27,217 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 81 transitions. [2021-05-02 17:24:27,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 17:24:27,217 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:24:27,217 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:24:27,425 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:24:27,425 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:24:27,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:24:27,426 INFO L82 PathProgramCache]: Analyzing trace with hash 1996886914, now seen corresponding path program 6 times [2021-05-02 17:24:27,426 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:24:27,427 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1455162685] [2021-05-02 17:24:27,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:24:27,433 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:24:27,434 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2141946694] [2021-05-02 17:24:27,434 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 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 17:24:27,508 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-05-02 17:24:27,508 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:24:27,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 17:24:27,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:24:27,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:24:27,544 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:24:27,563 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:24:27,565 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:24:27,573 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:24:27,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:24:27,598 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:24:27,599 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:24:27,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:24:27,610 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:24:27,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:24:27,625 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:24:27,735 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 40 proven. 34 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-05-02 17:24:27,736 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:24:27,736 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1455162685] [2021-05-02 17:24:27,736 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:24:27,738 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2141946694] [2021-05-02 17:24:27,738 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2141946694] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:24:27,738 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:24:27,738 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 17:24:27,738 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628200324] [2021-05-02 17:24:27,739 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 17:24:27,739 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:24:27,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 17:24:27,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:24:27,739 INFO L87 Difference]: Start difference. First operand 71 states and 81 transitions. Second operand has 11 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 6 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-02 17:24:27,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:24:27,909 INFO L93 Difference]: Finished difference Result 78 states and 87 transitions. [2021-05-02 17:24:27,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 17:24:27,910 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 6 states have call predecessors, (10), 4 states have call successors, (10) Word has length 61 [2021-05-02 17:24:27,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:24:27,911 INFO L225 Difference]: With dead ends: 78 [2021-05-02 17:24:27,911 INFO L226 Difference]: Without dead ends: 73 [2021-05-02 17:24:27,911 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 94.2ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:24:27,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-05-02 17:24:27,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2021-05-02 17:24:27,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 44 states have internal predecessors, (45), 18 states have call successors, (18), 12 states have call predecessors, (18), 11 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-02 17:24:27,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 79 transitions. [2021-05-02 17:24:27,920 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 79 transitions. Word has length 61 [2021-05-02 17:24:27,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:24:27,920 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 79 transitions. [2021-05-02 17:24:27,920 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 6 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-02 17:24:27,920 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 79 transitions. [2021-05-02 17:24:27,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 17:24:27,921 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:24:27,921 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 9, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:24:28,144 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:24:28,145 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:24:28,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:24:28,145 INFO L82 PathProgramCache]: Analyzing trace with hash -415362136, now seen corresponding path program 7 times [2021-05-02 17:24:28,145 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:24:28,145 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1500919927] [2021-05-02 17:24:28,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:24:28,154 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:24:28,154 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1459644659] [2021-05-02 17:24:28,154 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:24:28,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:24:28,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 17:24:28,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:24:28,360 INFO L134 CoverageAnalysis]: Checked inductivity of 183 backedges. 18 proven. 21 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 17:24:28,360 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:24:28,360 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1500919927] [2021-05-02 17:24:28,361 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:24:28,361 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1459644659] [2021-05-02 17:24:28,361 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1459644659] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:24:28,361 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:24:28,361 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 17:24:28,361 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464087360] [2021-05-02 17:24:28,361 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 17:24:28,361 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:24:28,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 17:24:28,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:24:28,362 INFO L87 Difference]: Start difference. First operand 73 states and 79 transitions. Second operand has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 5 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2021-05-02 17:24:28,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:24:28,482 INFO L93 Difference]: Finished difference Result 87 states and 98 transitions. [2021-05-02 17:24:28,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:24:28,483 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 5 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) Word has length 68 [2021-05-02 17:24:28,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:24:28,489 INFO L225 Difference]: With dead ends: 87 [2021-05-02 17:24:28,489 INFO L226 Difference]: Without dead ends: 85 [2021-05-02 17:24:28,490 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 41.1ms TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:24:28,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-02 17:24:28,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2021-05-02 17:24:28,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 48 states have (on average 1.0625) internal successors, (51), 50 states have internal predecessors, (51), 22 states have call successors, (22), 13 states have call predecessors, (22), 12 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-02 17:24:28,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 93 transitions. [2021-05-02 17:24:28,507 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 93 transitions. Word has length 68 [2021-05-02 17:24:28,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:24:28,507 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 93 transitions. [2021-05-02 17:24:28,508 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 5 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2021-05-02 17:24:28,508 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 93 transitions. [2021-05-02 17:24:28,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 17:24:28,509 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:24:28,509 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:24:28,724 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 17:24:28,725 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:24:28,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:24:28,725 INFO L82 PathProgramCache]: Analyzing trace with hash -1903584988, now seen corresponding path program 8 times [2021-05-02 17:24:28,725 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:24:28,725 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [999438773] [2021-05-02 17:24:28,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:24:28,732 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:24:28,732 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1234023656] [2021-05-02 17:24:28,733 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 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:24:28,811 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:24:28,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:24:28,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 17:24:28,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:24:29,019 INFO L134 CoverageAnalysis]: Checked inductivity of 224 backedges. 19 proven. 52 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-05-02 17:24:29,019 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:24:29,019 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [999438773] [2021-05-02 17:24:29,019 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:24:29,020 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1234023656] [2021-05-02 17:24:29,020 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1234023656] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:24:29,020 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:24:29,020 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 17:24:29,020 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1772908005] [2021-05-02 17:24:29,020 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 17:24:29,020 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:24:29,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 17:24:29,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:24:29,021 INFO L87 Difference]: Start difference. First operand 83 states and 93 transitions. Second operand has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2021-05-02 17:24:29,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:24:29,259 INFO L93 Difference]: Finished difference Result 91 states and 101 transitions. [2021-05-02 17:24:29,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 17:24:29,260 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 73 [2021-05-02 17:24:29,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:24:29,261 INFO L225 Difference]: With dead ends: 91 [2021-05-02 17:24:29,261 INFO L226 Difference]: Without dead ends: 89 [2021-05-02 17:24:29,261 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 81.1ms TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 17:24:29,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-02 17:24:29,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 88. [2021-05-02 17:24:29,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 51 states have (on average 1.0588235294117647) internal successors, (54), 53 states have internal predecessors, (54), 23 states have call successors, (23), 14 states have call predecessors, (23), 13 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-02 17:24:29,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 98 transitions. [2021-05-02 17:24:29,270 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 98 transitions. Word has length 73 [2021-05-02 17:24:29,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:24:29,271 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 98 transitions. [2021-05-02 17:24:29,271 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2021-05-02 17:24:29,271 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 98 transitions. [2021-05-02 17:24:29,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-02 17:24:29,271 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:24:29,271 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:24:29,488 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:24:29,489 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:24:29,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:24:29,489 INFO L82 PathProgramCache]: Analyzing trace with hash -2040579864, now seen corresponding path program 9 times [2021-05-02 17:24:29,489 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:24:29,489 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1887044559] [2021-05-02 17:24:29,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:24:29,496 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:24:29,496 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1974394051] [2021-05-02 17:24:29,496 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 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:24:29,616 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 17:24:29,616 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:24:29,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 17:24:29,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:24:29,623 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:24:29,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:24:29,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:24:29,754 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:24:45,001 WARN L205 SmtUtils]: Spent 6.31 s on a formula simplification that was a NOOP. DAG size: 22 [2021-05-02 17:24:45,010 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:24:45,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:24:45,041 INFO L134 CoverageAnalysis]: Checked inductivity of 269 backedges. 105 proven. 3 refuted. 0 times theorem prover too weak. 161 trivial. 0 not checked. [2021-05-02 17:24:45,041 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:24:45,041 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1887044559] [2021-05-02 17:24:45,041 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:24:45,042 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1974394051] [2021-05-02 17:24:45,042 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1974394051] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:24:45,042 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:24:45,042 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 17:24:45,042 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2074453875] [2021-05-02 17:24:45,042 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 17:24:45,042 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:24:45,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 17:24:45,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=52, Unknown=2, NotChecked=0, Total=72 [2021-05-02 17:24:45,043 INFO L87 Difference]: Start difference. First operand 88 states and 98 transitions. Second operand has 9 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-02 17:24:55,220 WARN L205 SmtUtils]: Spent 10.16 s on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-02 17:25:15,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:15,786 INFO L93 Difference]: Finished difference Result 102 states and 109 transitions. [2021-05-02 17:25:15,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 17:25:15,787 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) Word has length 78 [2021-05-02 17:25:15,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:15,788 INFO L225 Difference]: With dead ends: 102 [2021-05-02 17:25:15,788 INFO L226 Difference]: Without dead ends: 93 [2021-05-02 17:25:15,789 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 25435.6ms TimeCoverageRelationStatistics Valid=34, Invalid=96, Unknown=2, NotChecked=0, Total=132 [2021-05-02 17:25:15,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-02 17:25:15,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2021-05-02 17:25:15,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 58 states have internal predecessors, (59), 20 states have call successors, (20), 16 states have call predecessors, (20), 15 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-02 17:25:15,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 97 transitions. [2021-05-02 17:25:15,803 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 97 transitions. Word has length 78 [2021-05-02 17:25:15,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:15,803 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 97 transitions. [2021-05-02 17:25:15,803 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-02 17:25:15,803 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 97 transitions. [2021-05-02 17:25:15,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-02 17:25:15,804 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:15,804 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:25:16,004 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:16,005 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:16,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:16,005 INFO L82 PathProgramCache]: Analyzing trace with hash -2131153022, now seen corresponding path program 10 times [2021-05-02 17:25:16,005 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:16,005 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [621191779] [2021-05-02 17:25:16,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:16,012 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:25:16,012 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1581522267] [2021-05-02 17:25:16,012 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 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:16,077 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:25:16,077 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:25:16,078 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 17:25:16,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:25:16,277 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 24 proven. 38 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2021-05-02 17:25:16,277 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:25:16,277 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [621191779] [2021-05-02 17:25:16,277 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:25:16,277 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1581522267] [2021-05-02 17:25:16,278 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1581522267] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:25:16,278 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:25:16,278 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 17:25:16,278 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769413527] [2021-05-02 17:25:16,278 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 17:25:16,278 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:25:16,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 17:25:16,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:25:16,279 INFO L87 Difference]: Start difference. First operand 93 states and 97 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 6 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-05-02 17:25:16,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:16,423 INFO L93 Difference]: Finished difference Result 110 states and 117 transitions. [2021-05-02 17:25:16,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 17:25:16,423 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 6 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 85 [2021-05-02 17:25:16,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:16,424 INFO L225 Difference]: With dead ends: 110 [2021-05-02 17:25:16,424 INFO L226 Difference]: Without dead ends: 108 [2021-05-02 17:25:16,425 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 55.3ms TimeCoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:25:16,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-05-02 17:25:16,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2021-05-02 17:25:16,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 65 states have (on average 1.0461538461538462) internal successors, (68), 67 states have internal predecessors, (68), 24 states have call successors, (24), 18 states have call predecessors, (24), 17 states have return successors, (22), 21 states have call predecessors, (22), 22 states have call successors, (22) [2021-05-02 17:25:16,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 114 transitions. [2021-05-02 17:25:16,435 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 114 transitions. Word has length 85 [2021-05-02 17:25:16,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:16,435 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 114 transitions. [2021-05-02 17:25:16,435 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 6 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-05-02 17:25:16,435 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 114 transitions. [2021-05-02 17:25:16,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-05-02 17:25:16,436 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:16,436 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:25:16,659 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 17:25:16,659 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:16,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:16,660 INFO L82 PathProgramCache]: Analyzing trace with hash 1485297034, now seen corresponding path program 11 times [2021-05-02 17:25:16,660 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:16,660 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [389670527] [2021-05-02 17:25:16,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:16,667 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:25:16,667 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [265343392] [2021-05-02 17:25:16,667 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:16,779 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-05-02 17:25:16,779 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:25:16,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 51 conjunts are in the unsatisfiable core [2021-05-02 17:25:16,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:25:16,826 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:16,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:16,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:16,856 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:16,867 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:16,868 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:16,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:16,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:17,166 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 59 proven. 99 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-05-02 17:25:17,167 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:25:17,167 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [389670527] [2021-05-02 17:25:17,167 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:25:17,167 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [265343392] [2021-05-02 17:25:17,167 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [265343392] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:25:17,167 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:25:17,168 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 17:25:17,168 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [307140789] [2021-05-02 17:25:17,168 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 17:25:17,168 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:25:17,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 17:25:17,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:25:17,170 INFO L87 Difference]: Start difference. First operand 107 states and 114 transitions. Second operand has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 10 states have internal predecessors, (25), 7 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 7 states have call predecessors, (15), 7 states have call successors, (15) [2021-05-02 17:25:17,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:17,458 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2021-05-02 17:25:17,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 17:25:17,458 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 10 states have internal predecessors, (25), 7 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 7 states have call predecessors, (15), 7 states have call successors, (15) Word has length 90 [2021-05-02 17:25:17,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:17,459 INFO L225 Difference]: With dead ends: 118 [2021-05-02 17:25:17,459 INFO L226 Difference]: Without dead ends: 110 [2021-05-02 17:25:17,461 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 156.9ms TimeCoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2021-05-02 17:25:17,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-02 17:25:17,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 110. [2021-05-02 17:25:17,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 68 states have (on average 1.0294117647058822) internal successors, (70), 69 states have internal predecessors, (70), 23 states have call successors, (23), 19 states have call predecessors, (23), 18 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-02 17:25:17,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 114 transitions. [2021-05-02 17:25:17,480 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 114 transitions. Word has length 90 [2021-05-02 17:25:17,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:17,481 INFO L480 AbstractCegarLoop]: Abstraction has 110 states and 114 transitions. [2021-05-02 17:25:17,481 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 10 states have internal predecessors, (25), 7 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 7 states have call predecessors, (15), 7 states have call successors, (15) [2021-05-02 17:25:17,481 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 114 transitions. [2021-05-02 17:25:17,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-02 17:25:17,482 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:17,482 INFO L523 BasicCegarLoop]: trace histogram [16, 15, 15, 6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:25:17,705 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 17:25:17,705 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:17,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:17,705 INFO L82 PathProgramCache]: Analyzing trace with hash -72219928, now seen corresponding path program 12 times [2021-05-02 17:25:17,705 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:17,705 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1892312507] [2021-05-02 17:25:17,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:17,710 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:25:17,710 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1106471388] [2021-05-02 17:25:17,710 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 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:17,765 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 17:25:17,766 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:25:17,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 17:25:17,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:25:17,775 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:17,776 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:18,016 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 85 proven. 68 refuted. 0 times theorem prover too weak. 357 trivial. 0 not checked. [2021-05-02 17:25:18,016 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:25:18,016 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1892312507] [2021-05-02 17:25:18,016 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:25:18,016 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1106471388] [2021-05-02 17:25:18,017 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1106471388] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:25:18,017 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:25:18,017 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 17:25:18,017 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304222938] [2021-05-02 17:25:18,017 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 17:25:18,017 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:25:18,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 17:25:18,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:25:18,018 INFO L87 Difference]: Start difference. First operand 110 states and 114 transitions. Second operand has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 3 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 17:25:18,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:18,139 INFO L93 Difference]: Finished difference Result 120 states and 122 transitions. [2021-05-02 17:25:18,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 17:25:18,140 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 3 states have call predecessors, (12), 4 states have call successors, (12) Word has length 102 [2021-05-02 17:25:18,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:18,140 INFO L225 Difference]: With dead ends: 120 [2021-05-02 17:25:18,141 INFO L226 Difference]: Without dead ends: 118 [2021-05-02 17:25:18,141 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 66.1ms TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:25:18,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-05-02 17:25:18,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2021-05-02 17:25:18,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 74 states have (on average 1.027027027027027) internal successors, (76), 75 states have internal predecessors, (76), 23 states have call successors, (23), 21 states have call predecessors, (23), 20 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-02 17:25:18,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 120 transitions. [2021-05-02 17:25:18,151 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 120 transitions. Word has length 102 [2021-05-02 17:25:18,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:18,151 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 120 transitions. [2021-05-02 17:25:18,151 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 3 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 17:25:18,151 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 120 transitions. [2021-05-02 17:25:18,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-02 17:25:18,152 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:18,152 INFO L523 BasicCegarLoop]: trace histogram [17, 16, 16, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:25:18,368 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 17:25:18,369 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:18,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:18,369 INFO L82 PathProgramCache]: Analyzing trace with hash -1922485788, now seen corresponding path program 13 times [2021-05-02 17:25:18,369 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:18,369 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1385211655] [2021-05-02 17:25:18,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:18,375 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:25:18,376 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [470000178] [2021-05-02 17:25:18,376 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:18,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:25:18,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 47 conjunts are in the unsatisfiable core [2021-05-02 17:25:18,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:25:18,743 INFO L134 CoverageAnalysis]: Checked inductivity of 577 backedges. 40 proven. 102 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2021-05-02 17:25:18,743 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:25:18,743 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1385211655] [2021-05-02 17:25:18,744 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:25:18,744 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470000178] [2021-05-02 17:25:18,744 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [470000178] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:25:18,744 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:25:18,744 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 17:25:18,744 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1766832200] [2021-05-02 17:25:18,744 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 17:25:18,744 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:25:18,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 17:25:18,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2021-05-02 17:25:18,745 INFO L87 Difference]: Start difference. First operand 118 states and 120 transitions. Second operand has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 states have internal predecessors, (27), 7 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (18), 7 states have call predecessors, (18), 7 states have call successors, (18) [2021-05-02 17:25:19,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:19,057 INFO L93 Difference]: Finished difference Result 135 states and 140 transitions. [2021-05-02 17:25:19,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 17:25:19,058 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 states have internal predecessors, (27), 7 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (18), 7 states have call predecessors, (18), 7 states have call successors, (18) Word has length 107 [2021-05-02 17:25:19,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:19,059 INFO L225 Difference]: With dead ends: 135 [2021-05-02 17:25:19,059 INFO L226 Difference]: Without dead ends: 131 [2021-05-02 17:25:19,059 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 95 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 109.9ms TimeCoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2021-05-02 17:25:19,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-05-02 17:25:19,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 131. [2021-05-02 17:25:19,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 82 states have (on average 1.024390243902439) internal successors, (84), 83 states have internal predecessors, (84), 26 states have call successors, (26), 23 states have call predecessors, (26), 22 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 17:25:19,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 134 transitions. [2021-05-02 17:25:19,070 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 134 transitions. Word has length 107 [2021-05-02 17:25:19,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:19,071 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 134 transitions. [2021-05-02 17:25:19,071 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 states have internal predecessors, (27), 7 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (18), 7 states have call predecessors, (18), 7 states have call successors, (18) [2021-05-02 17:25:19,071 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 134 transitions. [2021-05-02 17:25:19,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-05-02 17:25:19,072 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:19,072 INFO L523 BasicCegarLoop]: trace histogram [20, 19, 19, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:25:19,295 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:19,296 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:19,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:19,296 INFO L82 PathProgramCache]: Analyzing trace with hash 523556042, now seen corresponding path program 14 times [2021-05-02 17:25:19,296 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:19,296 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1864785039] [2021-05-02 17:25:19,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:19,303 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:25:19,303 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [730171227] [2021-05-02 17:25:19,303 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:19,369 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:25:19,369 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:25:19,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 17:25:19,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:25:19,721 INFO L134 CoverageAnalysis]: Checked inductivity of 815 backedges. 37 proven. 148 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2021-05-02 17:25:19,721 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:25:19,721 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1864785039] [2021-05-02 17:25:19,721 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:25:19,721 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [730171227] [2021-05-02 17:25:19,721 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [730171227] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:25:19,721 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:25:19,721 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 17:25:19,721 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688860556] [2021-05-02 17:25:19,722 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 17:25:19,722 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:25:19,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 17:25:19,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:25:19,722 INFO L87 Difference]: Start difference. First operand 131 states and 134 transitions. Second operand has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 8 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (21), 8 states have call predecessors, (21), 8 states have call successors, (21) [2021-05-02 17:25:20,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:20,129 INFO L93 Difference]: Finished difference Result 152 states and 157 transitions. [2021-05-02 17:25:20,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 17:25:20,129 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 8 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (21), 8 states have call predecessors, (21), 8 states have call successors, (21) Word has length 124 [2021-05-02 17:25:20,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:20,130 INFO L225 Difference]: With dead ends: 152 [2021-05-02 17:25:20,130 INFO L226 Difference]: Without dead ends: 148 [2021-05-02 17:25:20,131 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 111 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 135.6ms TimeCoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-05-02 17:25:20,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-05-02 17:25:20,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 148. [2021-05-02 17:25:20,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 93 states have (on average 1.021505376344086) internal successors, (95), 94 states have internal predecessors, (95), 29 states have call successors, (29), 26 states have call predecessors, (29), 25 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2021-05-02 17:25:20,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 151 transitions. [2021-05-02 17:25:20,142 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 151 transitions. Word has length 124 [2021-05-02 17:25:20,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:20,142 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 151 transitions. [2021-05-02 17:25:20,142 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 8 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (21), 8 states have call predecessors, (21), 8 states have call successors, (21) [2021-05-02 17:25:20,142 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 151 transitions. [2021-05-02 17:25:20,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-05-02 17:25:20,143 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:20,143 INFO L523 BasicCegarLoop]: trace histogram [23, 22, 22, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:25:20,364 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 17:25:20,365 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:20,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:20,365 INFO L82 PathProgramCache]: Analyzing trace with hash -386753884, now seen corresponding path program 15 times [2021-05-02 17:25:20,365 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:20,365 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [428658777] [2021-05-02 17:25:20,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:20,372 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:25:20,373 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [771366992] [2021-05-02 17:25:20,373 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:20,423 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 17:25:20,423 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:25:20,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 17:25:20,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:25:20,623 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:20,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:20,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:20,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:20,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:20,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:20,669 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 189 proven. 2 refuted. 0 times theorem prover too weak. 903 trivial. 0 not checked. [2021-05-02 17:25:20,669 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:25:20,670 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [428658777] [2021-05-02 17:25:20,670 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:25:20,670 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [771366992] [2021-05-02 17:25:20,670 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [771366992] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:25:20,670 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:25:20,670 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 17:25:20,670 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715941922] [2021-05-02 17:25:20,672 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 17:25:20,672 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:25:20,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 17:25:20,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:25:20,673 INFO L87 Difference]: Start difference. First operand 148 states and 151 transitions. Second operand has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 2 states have call successors, (7) [2021-05-02 17:25:20,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:20,787 INFO L93 Difference]: Finished difference Result 148 states and 151 transitions. [2021-05-02 17:25:20,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:25:20,787 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 2 states have call successors, (7) Word has length 141 [2021-05-02 17:25:20,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:20,788 INFO L225 Difference]: With dead ends: 148 [2021-05-02 17:25:20,788 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 17:25:20,790 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 134 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 69.2ms TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:25:20,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 17:25:20,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 17:25:20,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-02 17:25:20,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 17:25:20,791 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 141 [2021-05-02 17:25:20,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:20,791 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 17:25:20,791 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 2 states have call successors, (7) [2021-05-02 17:25:20,791 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 17:25:20,791 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 17:25:21,021 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 17:25:21,022 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-05-02 17:25:56,251 WARN L205 SmtUtils]: Spent 34.98 s on a formula simplification. DAG size of input: 87 DAG size of output: 28 [2021-05-02 17:26:04,381 WARN L205 SmtUtils]: Spent 8.11 s on a formula simplification. DAG size of input: 57 DAG size of output: 28 [2021-05-02 17:26:19,081 WARN L205 SmtUtils]: Spent 14.70 s on a formula simplification. DAG size of input: 89 DAG size of output: 28 [2021-05-02 17:26:27,340 WARN L205 SmtUtils]: Spent 8.20 s on a formula simplification. DAG size of input: 41 DAG size of output: 21 [2021-05-02 17:26:41,490 WARN L205 SmtUtils]: Spent 14.13 s on a formula simplification. DAG size of input: 48 DAG size of output: 28 [2021-05-02 17:26:41,493 INFO L198 CegarLoopUtils]: For program point reach_errorEXIT(line 5) no Hoare annotation was computed. [2021-05-02 17:26:41,493 INFO L198 CegarLoopUtils]: For program point reach_errorENTRY(line 5) no Hoare annotation was computed. [2021-05-02 17:26:41,493 INFO L198 CegarLoopUtils]: For program point reach_errorFINAL(line 5) no Hoare annotation was computed. [2021-05-02 17:26:41,493 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2021-05-02 17:26:41,493 INFO L194 CegarLoopUtils]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#t~string5.base| |old(#t~string5.base)|) (= |#t~string5.offset| |old(#t~string5.offset)|) (= |old(#length)| |#length|) (= |#t~string6.base| |old(#t~string6.base)|) (= |#t~string6.offset| |old(#t~string6.offset)|) (= |#t~string4.base| |old(#t~string4.base)|) (= |#NULL.base| |old(#NULL.base)|) (= |#t~string4.offset| |old(#t~string4.offset)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|)) [2021-05-02 17:26:41,493 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2021-05-02 17:26:41,494 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-05-02 17:26:41,494 INFO L201 CegarLoopUtils]: At program point L-1(line -1) the Hoare annotation is: true [2021-05-02 17:26:41,494 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2021-05-02 17:26:41,494 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2021-05-02 17:26:41,494 INFO L201 CegarLoopUtils]: At program point assume_abort_if_notENTRY(lines 8 10) the Hoare annotation is: true [2021-05-02 17:26:41,494 INFO L198 CegarLoopUtils]: For program point L9(line 9) no Hoare annotation was computed. [2021-05-02 17:26:41,494 INFO L198 CegarLoopUtils]: For program point L9-2(lines 8 10) no Hoare annotation was computed. [2021-05-02 17:26:41,494 INFO L198 CegarLoopUtils]: For program point assume_abort_if_notEXIT(lines 8 10) no Hoare annotation was computed. [2021-05-02 17:26:41,494 INFO L198 CegarLoopUtils]: For program point L33(lines 30 42) no Hoare annotation was computed. [2021-05-02 17:26:41,494 INFO L194 CegarLoopUtils]: At program point L31(line 31) the Hoare annotation is: (and (= (* main_~s~0 4) (+ (* main_~t~0 main_~t~0) (* main_~t~0 2) 1)) (= (+ (* main_~a~0 2) 1) main_~t~0)) [2021-05-02 17:26:41,494 INFO L194 CegarLoopUtils]: At program point L31-1(line 31) the Hoare annotation is: (let ((.cse0 (* main_~s~0 4))) (and (= .cse0 (+ (* main_~a~0 8) (* (* main_~a~0 main_~a~0) 4) 4)) (= .cse0 (+ (* main_~t~0 main_~t~0) (* main_~t~0 2) 1)) (= (+ (* main_~a~0 2) 1) main_~t~0))) [2021-05-02 17:26:41,494 INFO L198 CegarLoopUtils]: For program point mainEXIT(lines 20 49) no Hoare annotation was computed. [2021-05-02 17:26:41,494 INFO L198 CegarLoopUtils]: For program point L46(line 46) no Hoare annotation was computed. [2021-05-02 17:26:41,494 INFO L198 CegarLoopUtils]: For program point mainFINAL(lines 20 49) no Hoare annotation was computed. [2021-05-02 17:26:41,494 INFO L194 CegarLoopUtils]: At program point L44(line 44) the Hoare annotation is: (let ((.cse0 (* main_~s~0 4))) (and (= .cse0 (+ (* main_~a~0 8) (* (* main_~a~0 main_~a~0) 4) 4)) (= .cse0 (+ (* main_~t~0 main_~t~0) (* main_~t~0 2) 1)) (= (+ (* main_~a~0 2) 1) main_~t~0) (= main_~s~0 (let ((.cse1 (div (+ main_~t~0 (- 1)) 2))) (+ (* .cse1 2) (* .cse1 .cse1) 1))))) [2021-05-02 17:26:41,494 INFO L194 CegarLoopUtils]: At program point L32(line 32) the Hoare annotation is: (let ((.cse0 (* main_~s~0 4))) (and (= .cse0 (+ (* main_~a~0 8) (* (* main_~a~0 main_~a~0) 4) 4)) (= .cse0 (+ (* main_~t~0 main_~t~0) (* main_~t~0 2) 1)) (= main_~s~0 (let ((.cse1 (div (+ main_~t~0 (- 1)) 2))) (+ (* .cse1 2) (* .cse1 .cse1) 1))) (= (+ (* main_~a~0 2) 1) main_~t~0))) [2021-05-02 17:26:41,494 INFO L201 CegarLoopUtils]: At program point mainENTRY(lines 20 49) the Hoare annotation is: true [2021-05-02 17:26:41,495 INFO L194 CegarLoopUtils]: At program point L30-2(lines 30 42) the Hoare annotation is: (and (= (* main_~s~0 4) (+ (* main_~t~0 main_~t~0) (* main_~t~0 2) 1)) (= (+ (* main_~a~0 2) 1) main_~t~0)) [2021-05-02 17:26:41,495 INFO L194 CegarLoopUtils]: At program point L30-3(lines 30 42) the Hoare annotation is: (let ((.cse0 (* main_~s~0 4))) (and (= .cse0 (+ (* main_~a~0 8) (* (* main_~a~0 main_~a~0) 4) 4)) (= .cse0 (+ (* main_~t~0 main_~t~0) (* main_~t~0 2) 1)) (= (+ (* main_~a~0 2) 1) main_~t~0) (= main_~s~0 (let ((.cse1 (div (+ main_~t~0 (- 1)) 2))) (+ (* .cse1 2) (* .cse1 .cse1) 1))))) [2021-05-02 17:26:41,495 INFO L201 CegarLoopUtils]: At program point L24(line 24) the Hoare annotation is: true [2021-05-02 17:26:41,495 INFO L198 CegarLoopUtils]: For program point L24-1(line 24) no Hoare annotation was computed. [2021-05-02 17:26:41,495 INFO L194 CegarLoopUtils]: At program point L45(line 45) the Hoare annotation is: (or (and (= (* main_~s~0 4) (+ (* main_~t~0 main_~t~0) (* main_~t~0 2) 1)) (= main_~s~0 (let ((.cse0 (div (+ main_~t~0 (- 1)) 2))) (+ (* .cse0 2) (* .cse0 .cse0) 1))) (= (+ (* main_~a~0 2) 1) main_~t~0)) (and (= main_~t~0 3) (= main_~s~0 (+ main_~t~0 1)))) [2021-05-02 17:26:41,495 INFO L201 CegarLoopUtils]: At program point __VERIFIER_assertENTRY(lines 11 17) the Hoare annotation is: true [2021-05-02 17:26:41,495 INFO L198 CegarLoopUtils]: For program point L13(lines 13 14) no Hoare annotation was computed. [2021-05-02 17:26:41,495 INFO L198 CegarLoopUtils]: For program point L12(lines 12 15) no Hoare annotation was computed. [2021-05-02 17:26:41,495 INFO L198 CegarLoopUtils]: For program point L12-2(lines 11 17) no Hoare annotation was computed. [2021-05-02 17:26:41,495 INFO L198 CegarLoopUtils]: For program point __VERIFIER_assertEXIT(lines 11 17) no Hoare annotation was computed. [2021-05-02 17:26:41,495 INFO L198 CegarLoopUtils]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 14) no Hoare annotation was computed. [2021-05-02 17:26:41,505 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 05:26:41 BoogieIcfgContainer [2021-05-02 17:26:41,505 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 17:26:41,506 INFO L168 Benchmark]: Toolchain (without parser) took 139737.79 ms. Allocated memory was 197.1 MB in the beginning and 317.7 MB in the end (delta: 120.6 MB). Free memory was 161.5 MB in the beginning and 206.4 MB in the end (delta: -44.9 MB). Peak memory consumption was 167.9 MB. Max. memory is 8.0 GB. [2021-05-02 17:26:41,506 INFO L168 Benchmark]: CDTParser took 0.15 ms. Allocated memory is still 197.1 MB. Free memory was 178.3 MB in the beginning and 178.1 MB in the end (delta: 106.0 kB). There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 17:26:41,506 INFO L168 Benchmark]: CACSL2BoogieTranslator took 266.91 ms. Allocated memory is still 197.1 MB. Free memory was 161.3 MB in the beginning and 180.0 MB in the end (delta: -18.8 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB. [2021-05-02 17:26:41,506 INFO L168 Benchmark]: Boogie Preprocessor took 41.88 ms. Allocated memory is still 197.1 MB. Free memory was 180.0 MB in the beginning and 178.7 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 17:26:41,506 INFO L168 Benchmark]: RCFGBuilder took 330.77 ms. Allocated memory is still 197.1 MB. Free memory was 178.4 MB in the beginning and 164.1 MB in the end (delta: 14.3 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. [2021-05-02 17:26:41,506 INFO L168 Benchmark]: TraceAbstraction took 139091.55 ms. Allocated memory was 197.1 MB in the beginning and 317.7 MB in the end (delta: 120.6 MB). Free memory was 163.7 MB in the beginning and 206.4 MB in the end (delta: -42.7 MB). Peak memory consumption was 170.0 MB. Max. memory is 8.0 GB. [2021-05-02 17:26:41,506 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.15 ms. Allocated memory is still 197.1 MB. Free memory was 178.3 MB in the beginning and 178.1 MB in the end (delta: 106.0 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 266.91 ms. Allocated memory is still 197.1 MB. Free memory was 161.3 MB in the beginning and 180.0 MB in the end (delta: -18.8 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 41.88 ms. Allocated memory is still 197.1 MB. Free memory was 180.0 MB in the beginning and 178.7 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 8.0 GB. * RCFGBuilder took 330.77 ms. Allocated memory is still 197.1 MB. Free memory was 178.4 MB in the beginning and 164.1 MB in the end (delta: 14.3 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 139091.55 ms. Allocated memory was 197.1 MB in the beginning and 317.7 MB in the end (delta: 120.6 MB). Free memory was 163.7 MB in the beginning and 206.4 MB in the end (delta: -42.7 MB). Peak memory consumption was 170.0 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 14]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 34 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 58523.9ms, OverallIterations: 18, TraceHistogramMax: 23, EmptinessCheckTime: 33.3ms, AutomataDifference: 34178.2ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 80471.4ms, InitialAbstractionConstructionTime: 29.4ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 587 SDtfs, 214 SDslu, 3019 SDs, 0 SdLazy, 2808 SolverSat, 214 SolverUnsat, 10 SolverUnknown, 0 SolverNotchecked, 22455.2ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1211 GetRequests, 1047 SyntacticMatches, 9 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 26936.9ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=148occurred in iteration=17, InterpolantAutomatonStates: 154, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 241.0ms AutomataMinimizationTime, 18 MinimizatonAttempts, 12 StatesRemovedByMinimization, 8 NontrivialMinimizations, HoareAnnotationStatistics: 0.0ms HoareAnnotationTime, 14 LocationsWithAnnotation, 63 PreInvPairs, 115 NumberOfFragments, 331 HoareAnnotationTreeSize, 63 FomulaSimplifications, 15676 FormulaSimplificationTreeSizeReduction, 242.2ms HoareSimplificationTime, 14 FomulaSimplificationsInter, 1699 FormulaSimplificationTreeSizeReductionInter, 80214.8ms HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 170.2ms SsaConstructionTime, 639.3ms SatisfiabilityAnalysisTime, 19051.1ms InterpolantComputationTime, 1209 NumberOfCodeBlocks, 1017 NumberOfCodeBlocksAsserted, 49 NumberOfCheckSat, 1191 ConstructedInterpolants, 0 QuantifiedInterpolants, 3751 SizeOfPredicates, 56 NumberOfNonLiveVariables, 3029 ConjunctsInSsa, 472 ConjunctsInUnsatCore, 18 InterpolantComputations, 2 PerfectInterpolantSequences, 4194/4820 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 30]: Loop Invariant Derived loop invariant: s * 4 == t * t + t * 2 + 1 && a * 2 + 1 == t RESULT: Ultimate proved your program to be correct! Received shutdown request...