/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/ps6-ll_unwindbound10.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 17:13:11,910 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 17:13:11,911 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 17:13:11,930 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 17:13:11,936 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 17:13:11,936 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 17:13:11,937 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 17:13:11,938 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 17:13:11,938 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 17:13:11,939 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 17:13:11,940 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 17:13:11,941 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 17:13:11,942 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 17:13:11,943 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 17:13:11,943 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 17:13:11,944 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 17:13:11,946 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 17:13:11,951 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 17:13:11,951 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 17:13:11,951 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 17:13:11,952 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 17:13:11,967 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 17:13:11,967 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 17:13:11,967 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 17:13:11,968 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 17:13:11,968 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 17:13:11,968 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 17:13:11,968 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 17:13:11,968 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 17:13:11,968 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 17:13:11,968 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 17:13:11,968 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 17:13:11,968 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 17:13:11,969 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 17:13:11,969 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 17:13:11,969 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 17:13:11,969 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 17:13:11,969 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 17:13:11,969 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 17:13:11,969 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 17:13:11,969 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 17:13:11,969 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:13:11,969 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 17:13:11,970 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 17:13:11,970 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 17:13:11,970 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 17:13:11,970 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 17:13:11,970 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 17:13:11,970 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 17:13:11,970 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 17:13:12,207 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 17:13:12,225 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 17:13:12,226 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 17:13:12,227 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 17:13:12,228 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 17:13:12,229 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/ps6-ll_unwindbound10.c [2021-05-02 17:13:12,274 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5c90527ae/1dfe891de6f844f18eca195a80ed4bc5/FLAGc0c779796 [2021-05-02 17:13:12,633 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 17:13:12,635 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps6-ll_unwindbound10.c [2021-05-02 17:13:12,639 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5c90527ae/1dfe891de6f844f18eca195a80ed4bc5/FLAGc0c779796 [2021-05-02 17:13:12,653 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5c90527ae/1dfe891de6f844f18eca195a80ed4bc5 [2021-05-02 17:13:12,655 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 17:13:12,656 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 17:13:12,657 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 17:13:12,657 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 17:13:12,659 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 17:13:12,660 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:13:12" (1/1) ... [2021-05-02 17:13:12,660 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@110e5b47 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:13:12, skipping insertion in model container [2021-05-02 17:13:12,660 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:13:12" (1/1) ... [2021-05-02 17:13:12,665 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 17:13:12,677 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 17:13:12,759 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/ps6-ll_unwindbound10.c[458,471] [2021-05-02 17:13:12,771 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:13:12,775 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 17:13:12,783 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/ps6-ll_unwindbound10.c[458,471] [2021-05-02 17:13:12,790 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:13:12,798 INFO L208 MainTranslator]: Completed translation [2021-05-02 17:13:12,798 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:13:12 WrapperNode [2021-05-02 17:13:12,798 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 17:13:12,799 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 17:13:12,799 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 17:13:12,799 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 17:13:12,831 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:13:12" (1/1) ... [2021-05-02 17:13:12,831 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:13:12" (1/1) ... [2021-05-02 17:13:12,835 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:13:12" (1/1) ... [2021-05-02 17:13:12,835 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:13:12" (1/1) ... [2021-05-02 17:13:12,838 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:13:12" (1/1) ... [2021-05-02 17:13:12,840 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:13:12" (1/1) ... [2021-05-02 17:13:12,841 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:13:12" (1/1) ... [2021-05-02 17:13:12,841 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 17:13:12,842 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 17:13:12,842 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 17:13:12,842 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 17:13:12,843 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:13:12" (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 17:13:12,894 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 17:13:12,894 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 17:13:12,894 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 17:13:12,894 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 17:13:12,894 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 17:13:12,895 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 17:13:12,895 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 17:13:12,895 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 17:13:12,895 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 17:13:12,896 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 17:13:12,896 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2021-05-02 17:13:12,896 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 17:13:12,896 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 17:13:12,896 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 17:13:12,898 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 17:13:12,898 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 17:13:12,898 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 17:13:12,898 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 17:13:12,898 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 17:13:12,898 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 17:13:13,120 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 17:13:13,120 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 17:13:13,121 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:13:13 BoogieIcfgContainer [2021-05-02 17:13:13,121 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 17:13:13,122 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 17:13:13,122 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 17:13:13,124 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 17:13:13,124 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 05:13:12" (1/3) ... [2021-05-02 17:13:13,124 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3478301c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:13:13, skipping insertion in model container [2021-05-02 17:13:13,124 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:13:12" (2/3) ... [2021-05-02 17:13:13,125 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3478301c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:13:13, skipping insertion in model container [2021-05-02 17:13:13,125 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:13:13" (3/3) ... [2021-05-02 17:13:13,125 INFO L111 eAbstractionObserver]: Analyzing ICFG ps6-ll_unwindbound10.c [2021-05-02 17:13:13,141 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 17:13:13,144 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 17:13:13,157 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 17:13:13,174 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 17:13:13,174 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 17:13:13,174 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 17:13:13,174 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 17:13:13,174 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 17:13:13,174 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 17:13:13,174 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 17:13:13,175 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 17:13:13,184 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 17:13:13,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 17:13:13,186 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:13:13,187 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 17:13:13,187 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:13:13,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:13:13,190 INFO L82 PathProgramCache]: Analyzing trace with hash 21872251, now seen corresponding path program 1 times [2021-05-02 17:13:13,195 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:13:13,195 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1630719988] [2021-05-02 17:13:13,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:13:13,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:13:13,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:13:13,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:13:13,336 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 17:13:13,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:13:13,340 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 17:13:13,340 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:13:13,341 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1630719988] [2021-05-02 17:13:13,341 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1630719988] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:13:13,341 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:13:13,341 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 17:13:13,342 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245556652] [2021-05-02 17:13:13,344 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 17:13:13,344 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:13:13,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 17:13:13,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:13:13,353 INFO L87 Difference]: Start difference. First operand has 29 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 3 states have (on average 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 17:13:13,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:13:13,422 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2021-05-02 17:13:13,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 17:13:13,423 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 17:13:13,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:13:13,428 INFO L225 Difference]: With dead ends: 50 [2021-05-02 17:13:13,428 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 17:13:13,430 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 45.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:13:13,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 17:13:13,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2021-05-02 17:13:13,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 17:13:13,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2021-05-02 17:13:13,452 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 17 [2021-05-02 17:13:13,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:13:13,453 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2021-05-02 17:13:13,453 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 17:13:13,453 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2021-05-02 17:13:13,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 17:13:13,454 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:13:13,454 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:13:13,454 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 17:13:13,454 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:13:13,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:13:13,455 INFO L82 PathProgramCache]: Analyzing trace with hash -119968982, now seen corresponding path program 1 times [2021-05-02 17:13:13,455 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:13:13,455 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [204347165] [2021-05-02 17:13:13,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:13:13,476 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:13:13,476 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [585056508] [2021-05-02 17:13:13,476 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 17:13:13,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:13:13,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 17:13:13,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:13:13,582 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:13,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:13,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:13,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:13,651 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:13,676 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 17:13:13,677 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:13:13,677 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [204347165] [2021-05-02 17:13:13,677 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:13:13,677 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [585056508] [2021-05-02 17:13:13,677 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [585056508] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:13:13,677 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:13:13,677 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 17:13:13,678 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259712130] [2021-05-02 17:13:13,678 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 17:13:13,678 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:13:13,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 17:13:13,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 17:13:13,679 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:13:13,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:13:13,700 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2021-05-02 17:13:13,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 17:13:13,701 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 18 [2021-05-02 17:13:13,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:13:13,702 INFO L225 Difference]: With dead ends: 34 [2021-05-02 17:13:13,702 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 17:13:13,703 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.1ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 17:13:13,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 17:13:13,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-05-02 17:13:13,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.1875) internal successors, (19), 17 states have internal predecessors, (19), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 17:13:13,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2021-05-02 17:13:13,711 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 18 [2021-05-02 17:13:13,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:13:13,711 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2021-05-02 17:13:13,711 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:13:13,711 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2021-05-02 17:13:13,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 17:13:13,712 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:13:13,712 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:13:13,932 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 17:13:13,933 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:13:13,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:13:13,933 INFO L82 PathProgramCache]: Analyzing trace with hash -118181522, now seen corresponding path program 1 times [2021-05-02 17:13:13,934 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:13:13,934 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [382470647] [2021-05-02 17:13:13,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:13:13,942 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:13:13,942 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [758289240] [2021-05-02 17:13:13,943 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 17:13:13,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:13:13,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 17:13:13,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:13:14,046 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:14,090 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 17:13:14,090 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:13:14,090 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [382470647] [2021-05-02 17:13:14,090 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:13:14,090 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [758289240] [2021-05-02 17:13:14,090 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [758289240] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:13:14,090 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:13:14,091 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-02 17:13:14,091 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [825377123] [2021-05-02 17:13:14,091 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 17:13:14,091 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:13:14,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 17:13:14,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:13:14,092 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 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 17:13:14,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:13:14,449 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2021-05-02 17:13:14,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:13:14,450 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 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 18 [2021-05-02 17:13:14,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:13:14,451 INFO L225 Difference]: With dead ends: 36 [2021-05-02 17:13:14,451 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 17:13:14,451 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 45.9ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:13:14,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 17:13:14,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 17:13:14,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 20 states have (on average 1.15) internal successors, (23), 21 states have internal predecessors, (23), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 17:13:14,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2021-05-02 17:13:14,458 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 18 [2021-05-02 17:13:14,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:13:14,458 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2021-05-02 17:13:14,458 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 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 17:13:14,459 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2021-05-02 17:13:14,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 17:13:14,459 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:13:14,459 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:13:14,673 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:13:14,673 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:13:14,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:13:14,673 INFO L82 PathProgramCache]: Analyzing trace with hash -1364840471, now seen corresponding path program 1 times [2021-05-02 17:13:14,673 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:13:14,674 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1800052129] [2021-05-02 17:13:14,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:13:14,682 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:13:14,682 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1736008938] [2021-05-02 17:13:14,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:13:14,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:13:14,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 17:13:14,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:13:14,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:14,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:14,763 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:14,805 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:14,809 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:14,810 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:14,840 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:14,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:14,858 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 17:13:14,859 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:13:14,859 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1800052129] [2021-05-02 17:13:14,859 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:13:14,859 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1736008938] [2021-05-02 17:13:14,859 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1736008938] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:13:14,859 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:13:14,859 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 17:13:14,859 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006143047] [2021-05-02 17:13:14,859 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 17:13:14,859 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:13:14,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 17:13:14,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 17:13:14,860 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 17:13:14,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:13:14,902 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2021-05-02 17:13:14,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 17:13:14,903 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 26 [2021-05-02 17:13:14,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:13:14,903 INFO L225 Difference]: With dead ends: 42 [2021-05-02 17:13:14,903 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 17:13:14,904 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 19.6ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:13:14,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 17:13:14,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 17:13:14,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 23 states have internal predecessors, (25), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 17:13:14,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2021-05-02 17:13:14,908 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 26 [2021-05-02 17:13:14,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:13:14,908 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2021-05-02 17:13:14,908 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 17:13:14,908 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2021-05-02 17:13:14,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 17:13:14,909 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:13:14,909 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:13:15,120 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:13:15,120 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:13:15,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:13:15,120 INFO L82 PathProgramCache]: Analyzing trace with hash -1363053011, now seen corresponding path program 1 times [2021-05-02 17:13:15,121 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:13:15,121 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [81884263] [2021-05-02 17:13:15,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:13:15,128 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:13:15,128 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1588627832] [2021-05-02 17:13:15,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:13:15,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:13:15,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 17:13:15,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:13:15,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:15,331 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:13:15,331 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:13:15,331 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [81884263] [2021-05-02 17:13:15,331 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:13:15,331 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1588627832] [2021-05-02 17:13:15,332 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1588627832] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:13:15,332 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:13:15,332 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 17:13:15,332 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446382101] [2021-05-02 17:13:15,333 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 17:13:15,337 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:13:15,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 17:13:15,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:13:15,338 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 17:13:15,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:13:15,436 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2021-05-02 17:13:15,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:13:15,437 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2021-05-02 17:13:15,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:13:15,439 INFO L225 Difference]: With dead ends: 44 [2021-05-02 17:13:15,439 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 17:13:15,439 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 54.8ms TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:13:15,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 17:13:15,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2021-05-02 17:13:15,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 28 states have internal predecessors, (30), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 17:13:15,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 46 transitions. [2021-05-02 17:13:15,444 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 46 transitions. Word has length 26 [2021-05-02 17:13:15,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:13:15,444 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 46 transitions. [2021-05-02 17:13:15,444 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 17:13:15,444 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 46 transitions. [2021-05-02 17:13:15,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 17:13:15,445 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:13:15,445 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:13:15,653 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:13:15,653 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:13:15,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:13:15,654 INFO L82 PathProgramCache]: Analyzing trace with hash -595737176, now seen corresponding path program 2 times [2021-05-02 17:13:15,654 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:13:15,654 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [874951520] [2021-05-02 17:13:15,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:13:15,666 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:13:15,666 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1943418168] [2021-05-02 17:13:15,666 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:13:15,709 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:13:15,710 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:13:15,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 17:13:15,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:13:15,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:15,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:15,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:15,733 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:15,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:15,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:15,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:15,751 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:15,751 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:15,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:15,768 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:15,777 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:13:15,777 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:13:15,777 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [874951520] [2021-05-02 17:13:15,777 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:13:15,777 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1943418168] [2021-05-02 17:13:15,777 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1943418168] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:13:15,777 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:13:15,777 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 17:13:15,778 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097720624] [2021-05-02 17:13:15,778 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 17:13:15,778 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:13:15,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 17:13:15,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:13:15,778 INFO L87 Difference]: Start difference. First operand 41 states and 46 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 17:13:16,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:13:16,783 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2021-05-02 17:13:16,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:13:16,785 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) Word has length 34 [2021-05-02 17:13:16,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:13:16,786 INFO L225 Difference]: With dead ends: 58 [2021-05-02 17:13:16,786 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 17:13:16,786 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 18.8ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:13:16,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 17:13:16,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2021-05-02 17:13:16,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 31 states have internal predecessors, (34), 10 states have call successors, (10), 7 states have call predecessors, (10), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 17:13:16,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2021-05-02 17:13:16,791 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 34 [2021-05-02 17:13:16,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:13:16,792 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2021-05-02 17:13:16,792 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 17:13:16,792 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2021-05-02 17:13:16,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 17:13:16,792 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:13:16,792 INFO L523 BasicCegarLoop]: trace histogram [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 17:13:17,007 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 17:13:17,007 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:13:17,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:13:17,008 INFO L82 PathProgramCache]: Analyzing trace with hash -593949716, now seen corresponding path program 2 times [2021-05-02 17:13:17,008 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:13:17,008 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [486909986] [2021-05-02 17:13:17,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:13:17,017 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:13:17,017 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [597112296] [2021-05-02 17:13:17,017 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 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 17:13:17,088 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:13:17,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:13:17,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 17:13:17,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:13:17,193 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 17:13:17,194 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:13:17,194 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [486909986] [2021-05-02 17:13:17,194 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:13:17,194 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [597112296] [2021-05-02 17:13:17,194 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [597112296] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:13:17,194 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:13:17,194 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 17:13:17,194 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489890072] [2021-05-02 17:13:17,194 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 17:13:17,194 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:13:17,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 17:13:17,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:13:17,195 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 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 17:13:23,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:13:23,533 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2021-05-02 17:13:23,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 17:13:23,534 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 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 34 [2021-05-02 17:13:23,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:13:23,534 INFO L225 Difference]: With dead ends: 56 [2021-05-02 17:13:23,534 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 17:13:23,535 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 50.8ms TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:13:23,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 17:13:23,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2021-05-02 17:13:23,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 36 states have internal predecessors, (39), 12 states have call successors, (12), 8 states have call predecessors, (12), 6 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 17:13:23,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 60 transitions. [2021-05-02 17:13:23,540 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 60 transitions. Word has length 34 [2021-05-02 17:13:23,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:13:23,541 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 60 transitions. [2021-05-02 17:13:23,541 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 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 17:13:23,541 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 60 transitions. [2021-05-02 17:13:23,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 17:13:23,541 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:13:23,541 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:13:23,742 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:13:23,742 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:13:23,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:13:23,743 INFO L82 PathProgramCache]: Analyzing trace with hash -1559147673, now seen corresponding path program 1 times [2021-05-02 17:13:23,743 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:13:23,743 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1768744379] [2021-05-02 17:13:23,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:13:23,749 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:13:23,749 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1307475006] [2021-05-02 17:13:23,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:13:23,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:13:23,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 17:13:23,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:13:23,833 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:23,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:23,866 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:23,867 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:23,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:23,871 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:23,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:23,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:23,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:25,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:25,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:25,990 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:13:26,012 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 11 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 17:13:26,013 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:13:26,013 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1768744379] [2021-05-02 17:13:26,013 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:13:26,013 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1307475006] [2021-05-02 17:13:26,013 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1307475006] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:13:26,013 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:13:26,013 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 17:13:26,013 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1141068324] [2021-05-02 17:13:26,013 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 17:13:26,013 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:13:26,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 17:13:26,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:13:26,014 INFO L87 Difference]: Start difference. First operand 53 states and 60 transitions. Second operand has 13 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 17:13:30,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:13:30,232 INFO L93 Difference]: Finished difference Result 55 states and 61 transitions. [2021-05-02 17:13:30,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 17:13:30,232 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 37 [2021-05-02 17:13:30,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:13:30,234 INFO L225 Difference]: With dead ends: 55 [2021-05-02 17:13:30,234 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 17:13:30,234 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2166.1ms TimeCoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-05-02 17:13:30,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 17:13:30,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-05-02 17:13:30,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 32 states have (on average 1.125) internal successors, (36), 34 states have internal predecessors, (36), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 17:13:30,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2021-05-02 17:13:30,239 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 37 [2021-05-02 17:13:30,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:13:30,239 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2021-05-02 17:13:30,239 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 17:13:30,239 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2021-05-02 17:13:30,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 17:13:30,240 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:13:30,240 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:13:30,451 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:13:30,452 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:13:30,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:13:30,452 INFO L82 PathProgramCache]: Analyzing trace with hash -1224790937, now seen corresponding path program 3 times [2021-05-02 17:13:30,452 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:13:30,452 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1224955775] [2021-05-02 17:13:30,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:13:30,459 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:13:30,459 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1607271825] [2021-05-02 17:13:30,459 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 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