/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/ps3-ll_valuebound20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 16:47:04,872 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 16:47:04,873 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 16:47:04,890 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 16:47:04,896 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 16:47:04,897 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 16:47:04,898 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 16:47:04,898 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 16:47:04,899 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 16:47:04,900 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 16:47:04,901 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 16:47:04,902 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 16:47:04,903 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 16:47:04,903 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 16:47:04,904 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 16:47:04,904 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 16:47:04,911 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 16:47:04,916 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 16:47:04,917 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 16:47:04,917 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 16:47:04,923 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 16:47:04,946 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 16:47:04,946 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 16:47:04,948 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 16:47:04,948 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 16:47:04,949 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 16:47:04,949 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 16:47:04,949 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 16:47:04,949 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 16:47:04,949 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 16:47:04,949 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 16:47:04,950 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 16:47:04,950 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 16:47:04,950 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 16:47:04,950 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 16:47:04,950 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 16:47:04,950 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 16:47:04,950 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 16:47:04,950 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 16:47:04,950 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 16:47:04,951 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 16:47:04,951 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 16:47:04,951 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 16:47:04,951 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 16:47:04,951 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 16:47:04,951 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 16:47:04,951 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 16:47:04,951 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 16:47:04,951 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 16:47:04,951 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 16:47:05,177 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 16:47:05,192 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 16:47:05,193 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 16:47:05,194 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 16:47:05,195 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 16:47:05,195 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/ps3-ll_valuebound20.c [2021-05-02 16:47:05,236 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dfeffe627/5e585c87ae6b4f05bb6913f971188b48/FLAG62e218c60 [2021-05-02 16:47:05,598 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 16:47:05,600 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps3-ll_valuebound20.c [2021-05-02 16:47:05,604 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dfeffe627/5e585c87ae6b4f05bb6913f971188b48/FLAG62e218c60 [2021-05-02 16:47:06,015 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dfeffe627/5e585c87ae6b4f05bb6913f971188b48 [2021-05-02 16:47:06,017 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 16:47:06,019 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 16:47:06,020 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 16:47:06,020 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 16:47:06,022 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 16:47:06,023 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 04:47:06" (1/1) ... [2021-05-02 16:47:06,023 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@31ce8137 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:47:06, skipping insertion in model container [2021-05-02 16:47:06,024 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 04:47:06" (1/1) ... [2021-05-02 16:47:06,028 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 16:47:06,037 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 16:47:06,140 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps3-ll_valuebound20.c[458,471] [2021-05-02 16:47:06,147 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 16:47:06,152 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 16:47:06,215 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps3-ll_valuebound20.c[458,471] [2021-05-02 16:47:06,225 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 16:47:06,240 INFO L208 MainTranslator]: Completed translation [2021-05-02 16:47:06,240 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:47:06 WrapperNode [2021-05-02 16:47:06,240 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 16:47:06,241 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 16:47:06,241 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 16:47:06,242 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 16:47:06,249 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:47:06" (1/1) ... [2021-05-02 16:47:06,250 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:47:06" (1/1) ... [2021-05-02 16:47:06,258 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:47:06" (1/1) ... [2021-05-02 16:47:06,258 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:47:06" (1/1) ... [2021-05-02 16:47:06,266 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:47:06" (1/1) ... [2021-05-02 16:47:06,270 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:47:06" (1/1) ... [2021-05-02 16:47:06,271 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:47:06" (1/1) ... [2021-05-02 16:47:06,274 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 16:47:06,275 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 16:47:06,275 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 16:47:06,275 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 16:47:06,276 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:47:06" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 16:47:06,335 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 16:47:06,335 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 16:47:06,335 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 16:47:06,335 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 16:47:06,335 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 16:47:06,335 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 16:47:06,336 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 16:47:06,336 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 16:47:06,336 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 16:47:06,336 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 16:47:06,336 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2021-05-02 16:47:06,337 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 16:47:06,337 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 16:47:06,337 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 16:47:06,338 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 16:47:06,338 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 16:47:06,338 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 16:47:06,338 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 16:47:06,338 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 16:47:06,338 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 16:47:06,550 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 16:47:06,550 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 16:47:06,551 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 04:47:06 BoogieIcfgContainer [2021-05-02 16:47:06,551 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 16:47:06,552 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 16:47:06,552 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 16:47:06,554 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 16:47:06,554 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 04:47:06" (1/3) ... [2021-05-02 16:47:06,554 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@231f1e47 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 04:47:06, skipping insertion in model container [2021-05-02 16:47:06,554 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:47:06" (2/3) ... [2021-05-02 16:47:06,555 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@231f1e47 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 04:47:06, skipping insertion in model container [2021-05-02 16:47:06,555 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 04:47:06" (3/3) ... [2021-05-02 16:47:06,555 INFO L111 eAbstractionObserver]: Analyzing ICFG ps3-ll_valuebound20.c [2021-05-02 16:47:06,576 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 16:47:06,578 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 16:47:06,589 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 16:47:06,626 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 16:47:06,626 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 16:47:06,626 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 16:47:06,627 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 16:47:06,627 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 16:47:06,627 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 16:47:06,627 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 16:47:06,627 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 16:47:06,638 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 16:47:06,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 16:47:06,641 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:47:06,642 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:47:06,642 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:47:06,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:47:06,649 INFO L82 PathProgramCache]: Analyzing trace with hash 1914087080, now seen corresponding path program 1 times [2021-05-02 16:47:06,654 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:47:06,654 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1443417379] [2021-05-02 16:47:06,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:47:06,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:47:06,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 16:47:06,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:47:06,786 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 16:47:06,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:47:06,790 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 16:47:06,790 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:47:06,790 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1443417379] [2021-05-02 16:47:06,791 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1443417379] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 16:47:06,791 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 16:47:06,791 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 16:47:06,792 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877411499] [2021-05-02 16:47:06,794 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 16:47:06,794 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:47:06,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 16:47:06,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 16:47:06,803 INFO L87 Difference]: Start difference. First operand has 27 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 16:47:06,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:47:06,844 INFO L93 Difference]: Finished difference Result 45 states and 56 transitions. [2021-05-02 16:47:06,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 16:47:06,846 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2021-05-02 16:47:06,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:47:06,850 INFO L225 Difference]: With dead ends: 45 [2021-05-02 16:47:06,850 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 16:47:06,852 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 33.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 16:47:06,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 16:47:06,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-05-02 16:47:06,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 16:47:06,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-05-02 16:47:06,875 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 17 [2021-05-02 16:47:06,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:47:06,876 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-05-02 16:47:06,876 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 16:47:06,876 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-05-02 16:47:06,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 16:47:06,876 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:47:06,877 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:47:06,877 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 16:47:06,877 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:47:06,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:47:06,877 INFO L82 PathProgramCache]: Analyzing trace with hash -1699034386, now seen corresponding path program 1 times [2021-05-02 16:47:06,878 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:47:06,878 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1955138211] [2021-05-02 16:47:06,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:47:06,889 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:47:06,890 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2136930859] [2021-05-02 16:47:06,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:47:06,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:47:06,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 16:47:06,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:47:07,023 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:47:07,075 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 16:47:07,076 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:47:07,076 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1955138211] [2021-05-02 16:47:07,076 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:47:07,076 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2136930859] [2021-05-02 16:47:07,076 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2136930859] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 16:47:07,076 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 16:47:07,077 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-02 16:47:07,077 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235361507] [2021-05-02 16:47:07,077 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 16:47:07,077 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:47:07,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 16:47:07,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 16:47:07,078 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 16:47:07,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:47:07,120 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2021-05-02 16:47:07,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 16:47:07,120 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2021-05-02 16:47:07,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:47:07,121 INFO L225 Difference]: With dead ends: 32 [2021-05-02 16:47:07,121 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 16:47:07,122 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 38.3ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-02 16:47:07,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 16:47:07,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-05-02 16:47:07,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 19 states have internal predecessors, (20), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 16:47:07,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2021-05-02 16:47:07,127 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 17 [2021-05-02 16:47:07,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:47:07,127 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2021-05-02 16:47:07,127 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 16:47:07,128 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2021-05-02 16:47:07,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 16:47:07,128 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:47:07,128 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:47:07,343 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 16:47:07,343 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:47:07,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:47:07,344 INFO L82 PathProgramCache]: Analyzing trace with hash 276758134, now seen corresponding path program 1 times [2021-05-02 16:47:07,344 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:47:07,344 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1145781516] [2021-05-02 16:47:07,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:47:07,358 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:47:07,358 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1163722446] [2021-05-02 16:47:07,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:47:07,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:47:07,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 16:47:07,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:47:07,483 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:47:07,558 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 16:47:07,558 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:47:07,559 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1145781516] [2021-05-02 16:47:07,559 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:47:07,559 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1163722446] [2021-05-02 16:47:07,559 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1163722446] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:47:07,559 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:47:07,559 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 16:47:07,559 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666465065] [2021-05-02 16:47:07,560 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 16:47:07,560 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:47:07,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 16:47:07,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 16:47:07,561 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 16:47:07,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:47:07,648 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2021-05-02 16:47:07,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 16:47:07,648 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2021-05-02 16:47:07,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:47:07,649 INFO L225 Difference]: With dead ends: 39 [2021-05-02 16:47:07,649 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 16:47:07,649 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 49.9ms TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-02 16:47:07,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 16:47:07,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-02 16:47:07,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 24 states have internal predecessors, (25), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 16:47:07,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2021-05-02 16:47:07,655 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 24 [2021-05-02 16:47:07,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:47:07,655 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2021-05-02 16:47:07,655 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 16:47:07,655 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2021-05-02 16:47:07,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 16:47:07,656 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:47:07,656 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:47:07,871 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:47:07,871 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:47:07,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:47:07,872 INFO L82 PathProgramCache]: Analyzing trace with hash 1640710638, now seen corresponding path program 2 times [2021-05-02 16:47:07,872 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:47:07,872 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [760599684] [2021-05-02 16:47:07,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:47:07,880 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:47:07,880 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1885134448] [2021-05-02 16:47:07,881 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:47:07,951 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 16:47:07,952 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 16:47:07,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 16:47:07,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:47:08,093 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 16:47:08,093 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:47:08,093 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [760599684] [2021-05-02 16:47:08,093 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:47:08,093 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1885134448] [2021-05-02 16:47:08,094 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1885134448] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:47:08,094 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:47:08,094 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 16:47:08,094 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989587486] [2021-05-02 16:47:08,094 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 16:47:08,094 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:47:08,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 16:47:08,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 16:47:08,095 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 16:47:08,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:47:08,173 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2021-05-02 16:47:08,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 16:47:08,174 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 31 [2021-05-02 16:47:08,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:47:08,176 INFO L225 Difference]: With dead ends: 46 [2021-05-02 16:47:08,176 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 16:47:08,178 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 55.4ms TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-02 16:47:08,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 16:47:08,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-05-02 16:47:08,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 29 states have internal predecessors, (30), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 16:47:08,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2021-05-02 16:47:08,198 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 31 [2021-05-02 16:47:08,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:47:08,198 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2021-05-02 16:47:08,199 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 16:47:08,199 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2021-05-02 16:47:08,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 16:47:08,200 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:47:08,200 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:47:08,408 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:47:08,409 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:47:08,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:47:08,409 INFO L82 PathProgramCache]: Analyzing trace with hash -481646730, now seen corresponding path program 3 times [2021-05-02 16:47:08,409 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:47:08,409 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [690671876] [2021-05-02 16:47:08,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:47:08,417 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:47:08,417 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [354800752] [2021-05-02 16:47:08,417 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